Dark Matter from Freeze-In via the Neutrino Portal
|
|
- Ophelia Hamilton
- 5 years ago
- Views:
Transcription
1 DO-TH 18/13 Dark Matter from Freeze-In via the Neutrino Portal Mathias Becker 1 arxiv: v1 [hep-ph] Jun 018 Fakultät für Physik, Technische Universität Dortmund, 441 Dortmund, Germany Abstract We investigate a minimal neutrino portal dark matter model (DM) where a right-handed neutrino both generates the observed neutrino masses and mediates between the SM and the dark sector, which consists of a fermion and a boson. In contrast to earlier work, we explore regions of the parameter space where DM is produced via freeze-in instead of freezeout motivated by the small neutrino Yukawa couplings in case of O (TeV) heavy neutrinos. For a non-resonant production of DM we can predict the heavy neutrino mass to be M N 10 TeV and achieve a lower bound on the DM mass of m χ 5 TeV. For the resonant production of DM, we find that it can be produced via freeze-in or freeze-out even with couplings of O (10 5 ). In the latter case to produce the observed for DM density we find m χ 100 ev. 1 mathias.becker@tu-dortmund.de
2 1 Introduction Both Dark Matter (DM) and neutrino masses provide a strong hints for beyond standard model physics (BSM). A simple way to accommodate for neutrino masses is to introduce right-handed neutrinos which are SM singlets, thereby allowing for a Majorana mass term. This enables mass generation via the type I seesaw mechanism. Furthermore, the resulting heavy neutrino state N is massive, electrically neutral and within a certain mass range even (cosmological) stable. If the heavy neutrino is considered to be a DM candidate it has to be stable. To ensure that its mass must satisfy M N < m e. Therefore, the Yukawa coupling has to be very small, namely y ν As a consequence, the production rate is small, thereby allowing for DM production via the freeze-in mechanism 1 []. In freeze-in scenarios, DM production never becomes efficient, i.e. the interaction rate Γ is always small compared to the Hubble parameter H, Γ H. Thus, DM is never in thermal equilibrium with the SM. On the contrary, freeze-out scenarios require Γ > H for a certain period of time (see figure 1). H freeze in freeze out Log i Y freeze out Y freeze in Y eq Log Y i Log t Log t Figure 1: Freeze-in and freeze-out scenarios in comparision: The left panel compares two interaction rates to the Hubble parameter H. Both of them are smaller than H for large temperatures since Γ T for T M and H T M 1 Pl. The difference between the freezeout case (green) and the freeze-in case (red) results from the much smaller coupling in the freeze-in case. Both interaction rates are exponentially suppressed for temperatures T M. The right panel shows the corresponding number densities. To account for the observed DM relic abundance via freeze-in of the decay h Nν, the heavy neutrino mass should be of O (10 kev). However, the possibility of kev sterile neutrino DM [3] might be excluded by experiments soon [4], more precisely by the non observation of the decay N νγ in gamma rays, see e.g. [5]. Moreover, in case of M N > m e, the heavy neutrino N is not stable and therefore not a DM candidate. But even in this case, the right-handed neutrino can act as a mediator to DM 1 A small DM production rate could also be generated by a large mediator mass as was pointed out in [1]. 1
3 since it is a SM singlet. This possibility is referred to as neutrino portal DM (NPDM) which has recently drawn attention in the literature [6 9]. However, these works only consider DM production via the freeze-out mechanism. This paper explores a minimal NPDM model where DM is produced via the freeze-in mechanism. The paper is organized as follows: In section, we present the model and its general properties. In section 3, we briefly review the Boltzmann equations which are solved for the considered model analytically within some special cases in section 4. Section 5 summarizes the results of a numerical solution of the Boltzmann equations. In section 6 we conclude. Setup In this section, we introduce the particle content and the general properties of the model. A model with the same particle content was investigated in [7] where DM production within freeze-out scenarios was explored. In addition to the SM particle content, the model includes a right-handed neutrino ν R to accommodate for the observed neutrino masses via the type I seesaw mechanism. Moreover, the model contains a dark sector consisting of a fermion χ and a scalar φ. While they are uncharged under the SM gauge groups, they are charged under a dark symmetry, e.g. a dark U(1). Assuming the SM particles to be uncharged under the dark symmetry renders the lighter particle of χ and φ to be a stable DM candidate since the dark symmetry forbids couplings between SM and dark sector particles. In this scenario, the resulting heavy neutrino N acts as a mediator between the DM and the SM particles since the singlet ν R can couple to χ and φ via a Yukawa coupling as long as the expression χφ is a singlet under all gauge groups. The parts of the Lagrangian relevant for the neutrino mass generation and the coupling to DM are given by L y ν ν L hν R 1 M N ν Rν C R y χ φ χν R +h.c.. (.1) }{{}}{{} DM coupling Neutrino mass generation Since the focus of this work is the DM production mechanism we restrict our analysis to only one generation of SM and DM particles. We do not take into account any contribution to the DM relic abundance from a possible Higgs portal interaction arising from the term (φφ ) (hh ) in the scalar potential and furthermore assume that φ does not acquire a VEV. Moreover, effects resulting from kinetic mixing of the vector mediators of the dark symmetry with the SM gauge bosons are neglected, thus our analysis focuses on the neutrino portal to DM only. As already mentioned, the observed neutrino masses are generated by a type I seesaw mechanism leading to mass eigenstates ν and N with masses of approximately m ν = y ν v M M and M N = M M in the limit of yνv M M where v is the VEV of the Higgs. They are described
4 in terms of the interaction eigenstates by: ( ) ( ) ν ν L = U N ν R 1 y v M N yv M N yv M N 1 y v M N ( ν L ν R ). (.) This mixing causes an interaction between the ν, N and the Higgs as well as a coupling of N to the SU() L gauge bosons. As presented in [10], the resulting interactions between the heavy and the light neutrinos are given by: L W g W lw µ γ µ (1 γ 5 ) B ln N + h.c., (.3) g W L Z 4 cos (Θ W ) Z0 µ { νγ µ [iim (C νn ) γ 5 Re (C νn )] N (.4) Nγ µ [iim (C NN ) γ 5 Re (C NN )] N + h.c. }, L H g W h { ν [(m ν + M N ) γ 5 Re (C νn ) + i (M N m ν ) Im (C νn )] N (.5) 4M W N (M N + M N ) γ 5 Re (C NN ) N }. The matrices B and C are defined as in [10] and in case of only one generation and real Yukawa couplings they yield: B ln y νv, C νn y ( ) νv yν v, C NN. (.6) M N M N Thus, the couplings relevant for heavy neutrino production are given by M W L W y ν lwµ γ µ (1 γ 5 ) N + h.c., (.7) MN [ M W L Z y ν Zµ 0 νγ µ γ 5 N + y ] νv Nγ µ γ 5 N + h.c., (.8) cos (Θ W ) M N M N L H y ν h νn yν v h M NN, (.9) N whereas the coupling of the heavy neutrino to the dark sector is governed by: L χ y χ 1 y v φ χn + h.c y MN χ φ χn + h.c.. (.10) Note that the parameters y ν and M N are not independent and related by the seesaw mechanism requiring y ν = m ν Mv 1. Therefore, the couplings in the eq. (.7)-(.9) can be rewritten as: g hνn = y ν = m νm N v g hnn = y ν v M N = mν v M N M g W ln,zνn = y W ν M N = mν M W M N v g ZNN = g ZνN y νv M N = mν M N (.11) Thus, for M N M W, the coupling g hνn is the dominant coupling and the hνn vertex is the only relevant one for DM production whereas for M N M W the W ln and ZνN vertices are dominant as long as M N m ν. 3
5 3 Boltzmann Equations Determining the relic abundance of the DM candidate requires solving the Boltzmann equations, which describe the time evolution of the particle number densities in the expanding universe. Adopting the formalism used in [11] the Boltzmann equations can be written as: ṅ N + 3Hn N = ( nn n a... a... γ eq (Na ij... ) n ) in j... n eq i n eq j... γ eq (ij Na... ). a,i,j,... n eq N neq (3.1) Here, n i is the number density of particle species i and H is the Hubble parameter. The 3Hn N term takes the expansion of the universe into account while the right hand side governs the impact of scattering processes which occur with a certain thermal rate γ eq. The equilibrium number densities n eq i are given by the momentum integral over the distribution function f of the respective particle species which is approximated with a Boltzmann distribution in our case: n eq = d 3 p (π) 3 f eq i = g ( i mi ) π m i T K. (3.) T For a two to two scattering involving only CP conserving interactions the quantity γ eq results in γ eq (Na ij) = γ eq (ij Na) = T ds ( ) s sˆσ (s) K 64π 4 1, (3.3) s min T [ ] where ˆσ (s) = s σ (s) λ 1, m N s, m a s with λ [a, b, c] = (a b c) 4bc, K 1 (x) is a Bessel function and s min = max [ (m a + M N ), (m i + m j ) ]. For a CP-conserving decay we obtain γ eq (N ij... ) = n eq K 1 (z) N K (z) Γ N. (3.4) Here z = M N T holds and Γ N is the decay rate of the particle in its rest frame. Next, to simplify the form of the Boltzmann equations they are written in terms of the quantity Y = n s E This leads to zhs E dy N dz instead of the number density where s E = π g s eff 45 T 3 is the entropy density. = a,i,j,... [ nn n a... γ eq (Na ij... ) n eq N neq a... n ] in j... n eq i n eq. (3.5) j... Finally, for a numerical solution, it is useful write eq. (3.5) in terms of log 10 (Y N ) and log 10 (z): d log 10 (Y N ) d log 10 (z) = z dy N Y N dz = [ γ eq (Na ij... ) nn n a... Hn eq N n eq N neq a... n ] in j... n eq i n eq. (3.6) j... a,i,j,... 4
6 Figure : Feynman diagrams for the DM production processes. 4 Relic Abundance: Analytic Estimates The scattering processes responsible for producing DM (the lighter particle of χ and φ) can be classified into two categories: SM Particle Scattering and Heavy Neutrino Scattering. The SM particle scattering processes involve two SM particles in the initial state, have χ and φ in the final state and are mediated by the heavy neutrino. Consequently, we have σ yνy χ. The heavy neutrino scattering processes have two heavy neutrinos in the initial state and produce a pair of χ or φ. Here, we have σ yχ. 4 In addition to the different dependence on the couplings y ν and y χ, for SM particle scattering processes we can assume the SM particles to be in thermal equilibrium whereas the heavy neutrino N is only in thermal equilibrium if the production via (inverse) decays as e.g. (νh N) h νn is sufficiently efficient. Consequently, even in the case of y χ y ν the heavy neutrino scattering might not be the dominant production channel since n N n eq 1 could be N the case. All contributing diagrams are displayed in figure. 4.1 SM Particle Scattering For the rest of the discussion, we assume that the dark sector particles are roughly the same in mass and therefore replace m φ = m χ and furthermore assume M N > M W. As discussed in the end of chapter, for M N M W the coupling of the heavy neutrino to the Higgs and a light neutrino is much larger than the coupling to the SU() gauge bosons. Therefore, we only take the contribution of vh φχ into account. The relevant cross section is given in 5
7 appendix A (A.1) and for m φ = m χ results in s ( s 4mχ) (s + 4MN m χ + MN ) σ vh χφ (s) [ ]. (4.1) 3πs (s MN ) + Γ N M N Here, Γ N is the total decay width of the propagating neutrino which can decay into vh for M N > m h and into χφ for M N > m χ + m φ. The decay width is also given in appendix A (A.). Next, we use eq. (3.3) to determine the thermal rate of the process. There are two cases to be distinguished: The resonant case with M N m χ + m φ where M N s min and thus it is integrated over the resonance of the cross section σ vh χφ The non-resonant case with M N < m χ + m φ where M N < s min First, we discuss the non-resonant case where we neglect the contribution of the decay width Γ N. Moreover, for M N m χ the integral in eq. (3.3) is solvable analytically and results in: ( γ eq (vh χφ) = m χt yνy χk mχ ) 1 T. (4.) 56π 5 Therewith, eq. (3.5) for the dark sector particles results in: zhs dy ( ) χ(φ) n χ n φ = γ eq (vh χφ) dz n eq χ n eq n hn ν φ n eq. (4.3) h neq ν The number density of DM particles is given by n χ + n φ and we assume all SM particles to be in thermal equilibrium, i.e. n SM = n eq SM. Furthermore, since we are investigating a weakly interacting dark sector we assume n χ(φ) n eq χ(φ) during the time of production. Thus, zhs dy DM dz = γ eq (vh χφ). (4.4) The factor of arises due to the assumption that the slightly heavier particle of χ and φ is long lived but might eventually decay to the stable one, hence Y DM = Y χ + Y φ. Integrating from z = 0 to z = yields: Y DM (z ) = 135M pl yνy χ 14 π 5 geff s. (4.5) geff m χ Remarkably, the result is inverse proportional to the DM mass m χ, i.e. the energy density is independent of m χ. This allows for predicting the value of the product of the Yukawa couplings y ν y χ by setting Y DM (z ) = Y DM,exp, with Y DM,exp = Ω DM Ω B m B m DM Y B m B m 1 χ. (4.6) 6
8 The experimental values for Ω DM, Ω B, the density parameter for baryons, and Y B,the baryon number density in a co-moving volume, are taken from [1] and m B, the average baryon mass, is approximated with the proton mass. Evaluating Y DM (z ) = Y DM,exp results in: (y ν y χ ) 10 3 m B M Pl 10 1, (4.7) The implications of this result are discussed in chapter 4.3 Next, we discuss the resonant case, i.e. M N m χ + m φ. As it was pointed out in [13], in this case it is useful to approximate the Breit-Wigner peak in eq. (4.1) with: c dx f (x) (x a) + b f (a), (4.8) b which is valid as long as b a, i.e. Γ N M N. With that we find γ eq (vh χφ) = T K ( MN ) M 1 N (M T (y 3π 3 ν y χ ) N m h ) (M N + m χ ) MN 4m χ yν (MN m h ) + yχm N (M N + m χ ) MN 4m χ M N m χ,h ( T K MN 1 (y ν y χ ) = M 3 3π 3 yν + yχ N. (4.9) T ) The integration of the approximated Boltzmann equation (4.4) results in: Y DM (z ) = 7M pl (y ν y χ ) 1 4π 5 geff s. (4.10) geff yν + yχ M N Since the result is not proportional to m 1 χ fitting the observed DM density depends on the DM mass m χ itself. Again, we postpone the discussion of the result to chapter Heavy Neutrino Scattering The cross sections for the heavy neutrino scattering processes are given in Appendix A. For the case of M N m χ m φ they result in σ NN χχ = yχ 4 1 4m χ s, 16πs ( ) (4.11) σ NN φφ = yχ 4 arctanh 1 4m χ 1 4m χ s s 16π s (4.1) Within this limit, we find an analytic expression for the thermal rate of the process NN χχ γ eq (NN χχ) = y 4 χ 7 ) ( m χt K mχ 1 T. (4.13) 18π 6
9 Although it is not possible to find an analytic expression for the process NN φφ it turns out that σ NN χχ σ NN φφ for all s. Therefore, we approximate its contribution to the DM production in the derivation of an analytic result by the contribution of the process NN χχ. The Boltzmann equation for the DM density Y DM = Y χ + Y φ results in zhs E dy DM dz = 4γ eq (NN χχ), (4.14) and the factor four arises since two χ/φ particles are produced = n eq N. This by again assuming n χ n eq χ and due to γ eq (NN φφ) γ eq (NN χχ). Furthermore, we assumed n N assumption is only valid if the processes that keeps N in thermal equilibrium, e.g. the inverse decay νh N, are sufficiently efficient. The integration of eq. (4.14) yields: Y DM (z ) = 7M Pl yχ 4 1 π 6 geff s. (4.15) geff m χ As for the SM particle scattering in the limit of M N m χ, the DM density is inverse proportional to its mass and thus allows for a prediction of yχ However, for a realistic result we have to consider both - SM particle scattering and heavy neutrino scattering - processes. This is discussed in the next chapter. For the case where the SM scattering processes are in the resonant regime, i.e. M N > m χ +m φ, the cross section given by eq. (A.5) consists of two terms. The first can be integrated in the limit M N m χ to obtain the thermal rate ( ) γ eq yχ 4 T MN 3 M G 3,0 64π 11 1,3 T 1 3, 1, 1. (4.16) Even within this limit it is not possible to obtain an analytic result for the second term in the cross section. However, the contribution of this term to the cross section is smaller or equal compared to the contribution of the first term for all center of mass energies s. Hence we approximate the thermal rate by two times (4.16). Here, the integration of eq. (4.14) results in: Y DM (z ) = 3 3 y 4 χm Pl 51π 6 g eff g s eff M N. (4.17) 4.3 Discussion of the Analytic Results In the limit of M N m χ m φ we found analytic solutions for the DM relic density for both types of processes. Combining both results yields: ( ) 7M Pl 1 5 Y DM (z ) = 1 π 6 geff s geff m χ πy νyχ + yχ 4. (4.18) 8
10 By comparing this expression with the observed DM density (4.6) one obtains ( ) 5 πy νyχ + yχ (4.19) Therefore, the coupling y χ is required to be smaller than 10 5 in order to not overproduce DM. In principle, the couplings y χ and y ν are unrelated. However, both describe a coupling to the right-handed neutrino and - if the heavy neutrino is lighter than O (10 15 GeV) - both couplings are required to be relatively small. This motivates the idea that they might be suppressed by the same mechanism, thus resulting in y ν y χ.. Considering a model which generates y χ y ν allows for constraining the mass of the heavy neutrino since with that eq. (4.19) reads 5π + yν 4 = 5π + ( ) mν M N (4.0) v Thus, to fit the observed DM density (4.6), M N 10 TeV is required. However, we achieved this result by assuming that the heavy neutrino is always in thermal equilibrium, m χ M N and by only taking into account the dominant processes of the SM particle and heavy neutrino scattering each. From eq. (4.18), we see that the contribution of the heavy neutrino scattering processes only accounts for roughly ten percent of the produced DM in case of y χ = y ν. Thus, the result will not be altered significantly if the heavy neutrino is out of equilibrium. Also, taking into account the sub-dominant processes does not have a significant impact since they are suppressed by M W. The only significant change will occur in MN areas of the parameter space where m χ M N, thereby violating the assumption of m χ M N. For these reasons in section 5, we solve the Boltzmann equations numerically for the case of y ν = y χ. In addition, we found an analytic solution for the DM relic density in the limit M N m χ where the SM particle scattering processes are in the resonant regime: ( 3 3 M Pl Y DM (z ) = 9 π 6 geff s 7 π y χy ) ν + y 4 geff M N yν + yχ χ. (4.1) Again, we obtain an upper bound on y χ from the measurement of the DM energy density by setting y ν = 0 which results in y χ 10 ( 5 M N m 1 4 χ. Moreover, in case of y χ y ν we find the observed DM energy density if y χ 10 1 MN m χ. However, if y χ y ν does not hold the approximation of n χ n eq χ we used to derive (4.18) does not apply anymore. To illustrate that we look at the case y χ = y ν, where (4.18) results in: Y DM (z ) 3 3 ) 1 m ν M Pl π 5 geff s (4.) geff v For example, such a mechanism could be an extra dimensional model where the right-handed neutrino in contrast to all other particles propagates in an extra dimension since it is uncharged under all considered gauge groups. Thereby, its coupling gets suppressed by the reduced wave function overlap [14, 15] This concrete possibility is not explored within this paper but might be explored in a future work. 9
11 M N 10TeV Correct DM Density resonant Correct DM Density 00eV non resonant 100eV 5TeV m Χ Figure 3: Parameter space for y χ = y ν : The black line divides the plane spanned by the DM mass m χ and the mediator mass M N into two halfs. The upper one corresponds to the regime where the resonance in the production via SM particle scattering is accessible whereas the lower one corresponds to the non-resonant regime. The red and green line show the regions where the correct amount of DM is produced for the non-resonant and the resonant regime, respectively. In the non-resonant regime, producing the correct density only depends on the mediator mass. On the contrary, it only depends on the DM mass in the resonant region. Using eq. (3.) we find that Y eq DM 10. Therefore, n χ n eq χ cannot be satisfied. Hence, the freeze-in scenario does not apply here. Nevertheless, it is still possible to account for the correct amount of DM. In this case, we recover a freeze-out like scenario since due to the resonance the interaction rate becomes as large as the Hubble parameter although the system is only weakly coupled. Thus, DM comes into equilibrium with the SM and freezes out as soon as the interaction rate becomes smaller than the Hubble parameter. This occurs approximately at T = M N. 3 Consequently, the number density can be estimated by the equilibrium density at freeze-out and since we assumed M N m χ the number density (3.) at freeze out yields: Y DM (z ) = Y eq χ (T M N ) = 45g χ π 4 g s eff (4.3) Equating this result with eq. (4.6) yields a DM mass of m χ = O (100 ev). We summarized our results for the case y χ = y ν in a schematic plot (see fig. 3). 3 This is due to the fact that the main contribution to the interaction rate comes from the resonance at s = M N, i.e. as soon as the temperature drops below M N the resonance cannot be reached efficiently anymore and therefore the interaction rate decreases significantly. 10
12 Y th Y exp M N TeV m Χ TeV Figure 4: The numerically obtained DM density Y th is compared to the observed DM density Y exp for different values of the DM mass m χ and the mediator mass M N : The solid black line shows the points where the observed DM density is reproduced. For points within the purple area DM gets overproduced whereas the DM density is too small in the green area. The hatched area displays the resonant production regime and was not scanned. 5 Numerical Analysis In this section we present the results of the numerical solution of the Boltzmann equation for the DM candidate χ. We solved (3.5) for χ and N in the non-resonant regime, including the processes νh χφ, NN χχ, NN φφ and N νh or h Nν. Furthermore, we set y ν y χ and m φ = m χ. As a consequence of our analytic approximations we expect the scenario to work for M N 10 TeV and m χ 5 TeV. However, especially if M N m χ our approximations from the analytic computation do not apply. Also N, as shown in appendix B will reach thermal equilibrium via the process N νh around T = M N. Thus, the contribution of NN χχ and NN φφ might be smaller than expected. We solved the problem numerically for M N < m χ while assuming that during the time of the DM production n χ = n φ and that φ eventually decays into χ so that the DM relic density is given by n χ + n φ. The initial conditions are that the SM particles are in thermal equilibrium while N, χ and φ are not present. The interpolation of the thermal rates and the numerical solution of the Boltzmann equations are performed with Mathematica. The obtained results are summarized in figure 4 where we compared the obtained DM density Y th to the experimentally observed DM density Y exp for different values of m χ and M N. As expected, for M N m χ the correct density is obtained for a constant value of M N of M N 30 TeV. Also we see that, in fact, there is a lower bound on the DM mass which results 11
13 in M N 5 TeV. Lastly we comment on the case y ν y χ : Here, the coupling y χ which is determined by the mediator mass via eq. (4.19) is larger than y ν when M N 10 TeV. In this case, most of the DM gets produced via heavy neutrino scattering. Since we overestimated its contribution to the relic density by assuming n N = n eq N a larger coupling y χ will be required and therefore relax the upper bound on y χ The numerical analysis of the resonant case is not performed within this paper. As in the non-resonant region, we expect the most significant deviations from the analytic result for cases where M N m χ. 6 Conclusion We have investigated a minimal neutrino portal DM model where the dark sector consists of a scalar φ and a fermion χ. In addition, the SM is extended by a right-handed neutrino which generates the neutrino masses via a type I seesaw mechanism and, furthermore, acts as a mediator between the SM and DM. Motivated by the small Yukawa couplings of the type I seesaw mechanism in case of small heavy neutrino masses of M N O (PeV) we studied DM production via the freeze-in mechanism which, in contrast to the freeze-out mechanism, requires interaction rates of Γ H. We derived analytic solutions for the resonant (M N > m χ + m φ ) and non-resonant (M N < m χ + m φ ) DM production regime. Adding the requirement that the coupling of the righthanded neutrino to the SM is of the same order of magnitude as its coupling to the dark sector increases the predictivity of the model and allows for predictions of the mediator or the DM mass respectively. In the non-resonant regime, we find M N 30 TeV and a lower bound on the DM mass m χ 5 TeV. Within the resonant regime, however, for y χ = y ν the resonant production of DM is strong enough to bring DM into equilibrium with the SM. Thus, we recover the usual freeze-out mechanism although the couplings between DM and the SM are very small. Moreover, in this scenario we can predict a DM mass of m χ 100 ev. For y χ y ν, nonetheless, DM production via freeze-in is still possible. To satisfy the observed DM energy density the coupling of the right-handed neutrino to DM has to be y χ 10 1 MN m χ. Thus, we demonstrated that producing the observed DM energy density within this model of neutrino portal DM is viable even with small couplings between the SM and the dark sector. An interesting extension of this model would be the explanation of the small Yukawa couplings of the right-handed neutrino to the SM and DM by a suppression mechanism. One explanation could be an extra dimensional model where the heavy neutrino in contrast to the SM and DM particles propagates in an extra dimension since it is the only singlet under all considered gauge groups. Thus, all couplings to the right-handed neutrino are suppressed by a volume factor which can even generate y χ y ν. Due to the tiny couplings of the right-handed neutrino to SM and DM direct detection 1
14 seems not viable. Therefore, exploring the detectability of this model might be an interesting prospect for a future work. Moreover, we only demonstrated a few working cases of this model. For example we considered only the case of m χ = m φ and M N > M W. Thus, an exploration of M N < M W which leads to different dominant interactions between the heavy neutrino N and the SM or a hierarchic dark sector might be interesting. A Cross Sections m 4 σ vh χφ (s) = yνy χ φ + ( s mχ) ( ) [ m φ s + m χ 4MN m χ s + (s + MN ) ( )] s + m χ m φ ] 16πs [(s MN ) + Γ N M N (A.1) Here, Γ N is the total decay width of the propagating neutrino which can decay into vh for M N > m h and into χφ for M N > m χ + m φ. The decay width is given by: Γ N = yν (MN m h ) 8πMN 3 + yχ (M N m φ + m χ ) (M N + m φ + m χ ) 8πMN 3 (M N m φ m χ ) (M N m φ + m χ ) (M N + m φ m χ ) (M N + m φ + m χ ) m φ =m χ = yν (MN (M m h ) N + m χ ) M + y N 4m χ 8πMN 3 χ. (A.) 8πM N 3M W [( σ W l χφ = yχy ν M 4πsM N (s MN W m ) l ) ( M W + ( m l M W ) 4MN m χ ) + ( )] s ( s 4m MN + m l MW χ + 4M N m χ m 4 l + (s M W ) m l (s + M W ) (A.3) ) 3M σ Zν χφ = yχy ν W 1 4m χ s [( ) ( ) s + M 16π MN (s M N ) (s M Z ) Z M N + 4M N m χ s M Z ] +s smz MZ 4 (A.4) ( ) σ NN χχ = y4 χ 1 4 m χ s 4m χ 4π s s 4MN 8M N (M N + m χ ) (s 4MN ) ( s 4m χ ( 4M 4 N + 8M 3 N m χ + m χs MN 4 4M N m χ + m χs (s 4M ) arctanh N ) ( ) s 4m χ MN s (A.5) 13
15 ( ) [ σ NN φφ = yχ 4 1 4m χ (s 4MN s ) ( ) ( ) s 4m χ m χ s + MN 4 + 4MNm 3 χ + [M N (m χ M N ) + s] [ ( ) ] m χ s 4M N + M 4 N (s 4MN arctanh ) ( ) s 4m χ s MN (A.6) B The Decay N vh The decay rate for the process N νh for M N > m h is given by: With that we find the interaction rate: Γ N = yν (MN m h ). (B.1) 8πMN 3 Γ = γ eq n 1 eq = K 1(z) K (z) γ eq = yν (MN m h ) K 1 (z) 8πMN 3 K (z). (B.) Comparing this result to the Hubble Parameter with M N m h yields: Γ H = 3m νm pl 40π z K 1 (z) g eff v K (z). (B.3) This quantity is greater than one for Temperatures of roughly T M N. Consequently we can expect the heavy neutrino to be in thermal equilibrium with the SM for T M N. References [1] S.-L. Chen and Z. Kang, JCAP 1805, 036 (018), [] L. J. Hall, K. Jedamzik, J. March-Russell, and S. M. West, JHEP 03, 080 (010), [3] S. Dodelson and L. M. Widrow, Phys. Rev. Lett. 7, 17 (1994), hep-ph/ [4] M. Drewes et al., JCAP 1701, 05 (017), [5] K. Perez et al., Phys. Rev. D95, 1300 (017), [6] M. Escudero, N. Rius, and V. Sanz, JHEP 0, 045 (017), [7] M. Escudero, N. Rius, and V. Sanz, Eur. Phys. J. C77, 397 (017), [8] M. G. Folgado, G. A. Gomez-Vargas, N. Rius, and R. Ruiz De Austri, (018),
16 [9] B. Batell, T. Han, D. McKeen, and B. Shams Es Haghi, Phys. Rev. D97, (018), [10] A. Pilaftsis, Z. Phys. C55, 75 (199), hep-ph/ [11] G. F. Giudice, A. Notari, M. Raidal, A. Riotto, and A. Strumia, Nucl. Phys. B685, 89 (004), hep-ph/ [1] Particle Data Group, C. Patrignani et al., Chin. Phys. C40, (016). [13] M. Blennow, E. Fernandez-Martinez, and B. Zaldivar, JCAP 1401, 003 (014), [14] N. Arkani-Hamed, S. Dimopoulos, G. R. Dvali, and J. March-Russell, Phys. Rev. D65, 0403 (001), hep-ph/ [15] M. Becker and H. Pas, Eur. Phys. J. C78, 73 (018),
Calculation of Momentum Distribution Function of a Non-Thermal Fermionic Dark Matter
Calculation of Momentum Distribution Function of a Non-Thermal Fermionic Dark Matter, March 8, 2017. arxiv:1612.02793, with Anirban Biswas. Aritra Gupta Why Non-Thermal? 1 / 31 The most widely studied
More informationProduction mechanisms for kev sterile neutrino dark matter in the Early Universe
Production mechanisms for kev sterile neutrino dark matter in the Early Universe based on JCAP06 (2015) 011, JCAP04 (2016) 003 & 1509.01289 in collaboration with J. König, A. Merle and A. Schneider Maximilian
More informationInvisible Sterile Neutrinos
Invisible Sterile Neutrinos March 25, 2010 Outline Overview of Sterile Neutrino Dark Matter The Inert Doublet Model with 3 Singlet Fermions Non-thermal Dark Matter Conclusion Work done in collaboration
More informationConstraining minimal U(1) B L model from dark matter observations
Constraining minimal U(1) B L model from dark matter observations Tanushree Basak Physical Research Laboratory, India 10th PATRAS Workshop on Axions, WIMPs and WISPs CERN Geneva, Switzerland July 3, 2014
More informationPhenomenology of low-energy flavour models: rare processes and dark matter
IPMU February 2 nd 2016 Phenomenology of low-energy flavour models: rare processes and dark matter Lorenzo Calibbi ITP CAS, Beijing Introduction Why are we interested in Flavour Physics? SM flavour puzzle
More informationModels of New Physics for Dark Matter
Models of New Physics for Dark Matter Carlos Muñoz instituto de física teórica ift-uam/csic departamento de física teórica dft-uam 1 PPC 2010, Torino, July 12-16 Crucial Moment for SUSY in next few years:
More informationExotic Charges, Multicomponent Dark Matter and Light Sterile Neutrinos
Exotic Charges, Multicomponent and Light Sterile Neutrinos Julian Heeck Max-Planck-Institut für Kernphysik, Heidelberg 2.10.2012 based on J.H., He Zhang, arxiv:1210.xxxx. Sterile Neutrinos Hints for ev
More informationkev sterile Neutrino Dark Matter in Extensions of the Standard Model
kev sterile Neutrino Dark Matter in Extensions of the Standard Model Manfred Lindner Max-Planck-Institut für Kernphysik, Heidelberg F. Bezrukov, H. Hettmannsperger, ML, arxiv:0912.4415, PRD81,085032 The
More informationSterile Neutrino Dark Matter & Low Scale Leptogenesis from a Charged Scalar
Sterile Neutrino Dark Matter & Low Scale Leptogenesis from a Charged Scalar Michele Frigerio Laboratoire Charles Coulomb, CNRS & UM2, Montpellier MF & Carlos E. Yaguna, arxiv:1409.0659 [hep-ph] GDR neutrino
More informationThe Flavour Portal to Dark Matter
Dark Side of the Universe 2015 Kyoto University The Flavour Portal to Dark Matter Lorenzo Calibbi ITP CAS, Beijing December 18th 2015 Introduction Why are we interested in Flavour Physics? SM flavour puzzle
More informationNon-Abelian SU(2) H and Two-Higgs Doublets
Non-Abelian SU(2) H and Two-Higgs Doublets Technische Universität Dortmund Wei- Chih Huang 25 Sept 2015 Kavli IPMU arxiv:1510.xxxx(?) with Yue-Lin Sming Tsai, Tzu-Chiang Yuan Plea Please do not take any
More informationSterile Neutrinos in Cosmology and Astrophysics
Kalliopi Petraki (UCLA) October 27, 2008 Particle Physics Neutrino Oscillation experiments: neutrinos have mass Cosmology and Astrophysics Plenty of unexplained phenomena Dark Matter Pulsar Kicks Supernova
More informationNeutrino Oscillation, Leptogenesis and Spontaneous CP Violation
Neutrino Oscillation, Leptogenesis and Spontaneous CP Violation Mu-Chun Chen Fermilab (Jan 1, 27: UC Irvine) M.-C. C & K.T. Mahanthappa, hep-ph/69288, to appear in Phys. Rev. D; Phys. Rev. D71, 351 (25)
More informationLeptogenesis. Neutrino 08 Christchurch, New Zealand 30/5/2008
Leptogenesis Neutrino 08 Christchurch, New Zealand 30/5/2008 Yossi Nir (Weizmann Institute of Science) Sacha Davidson, Enrico Nardi, YN Physics Reports, in press [arxiv:0802.2962] E. Roulet, G. Engelhard,
More informationThe Yang and Yin of Neutrinos
The Yang and Yin of Neutrinos Ernest Ma Physics and Astronomy Department University of California Riverside, CA 92521, USA The Yang and Yin of Neutrinos (2018) back to start 1 Contents Introduction The
More informationStable or Unstable Light Dark Matter arxiv: v1 [hep-ph] 27 Jul 2015
UCRHEP-T555 July 015 Stable or Unstable Light Dark Matter arxiv:1507.07609v1 [hep-ph] 7 Jul 015 Ernest Ma 1, M. V. N. Murthy, and G. Rajasekaran,3 1 Department of Physics and Astronomy, University of California,
More informationAsymmetric Sneutrino Dark Matter
Asymmetric Sneutrino Dark Matter Stephen West Oxford University Asymmetric Sneutrino Dark Matter and the Ω b /Ω dm Puzzle; hep-ph/0410114, PLB, Dan Hooper, John March- Russell, and SW from earlier work,
More informationThe Four Basic Ways of Creating Dark Matter Through a Portal
The Four Basic Ways of Creating Dark Matter Through a Portal DISCRETE 2012: Third Symposium on Prospects in the Physics of Discrete Symmetries December 4th 2012, Lisboa Based on arxiv:1112.0493, with Thomas
More informationA model of the basic interactions between elementary particles is defined by the following three ingredients:
I. THE STANDARD MODEL A model of the basic interactions between elementary particles is defined by the following three ingredients:. The symmetries of the Lagrangian; 2. The representations of fermions
More informationBSM physics and Dark Matter
BSM physics and Dark Matter Andrea Mammarella University of Debrecen 26-11-2013 1 Introduction and motivation 2 Dark Matter 3 MiAUMSSM 4 Dark Matter in the MiAUMSSM 5 Conclusion Introduction and motivation
More informationSimplified models in collider searches for dark matter. Stefan Vogl
Simplified models in collider searches for dark matter Stefan Vogl Outline Introduction/Motivation Simplified Models for the LHC A word of caution Conclusion How to look for dark matter at the LHC? experimentally
More informationNeutrinos and Fundamental Symmetries: L, CP, and CP T
Neutrinos and Fundamental Symmetries: L, CP, and CP T Outstanding issues Lepton number (L) CP violation CP T violation Outstanding issues in neutrino intrinsic properties Scale of underlying physics? (string,
More informationFermionic DM Higgs Portal! An EFT approach
Fermionic DM Higgs Portal An EFT approach Michael A. Fedderke University of Chicago Based on 1404.83 [hep-ph] (MF, Chen, Kolb, Wang) Unlocking the Higgs Portal ACFI, UMass, Amherst May 014 01 discovery
More informationBaryon-Lepton Duplicity as the Progenitor of Long-Lived Dark Matter
UCRHEP-T593 Aug 018 arxiv:1808.05417v [hep-ph] 5 Jan 019 Baryon-Lepton Duplicity as the Progenitor of Long-Lived Dark Matter Ernest Ma Physics and Astronomy Department, University of California, Riverside,
More informationAlternatives to the GUT Seesaw
Alternatives to the GUT Seesaw Motivations Higher-dimensional operators String instantons Other (higher dimensions, Higgs triplets) Motivations Many mechanisms for small neutrino mass, both Majorana and
More informationA realistic model for DM interactions in the neutrino portal paradigm
A realistic model for DM interactions in the neutrino portal paradigm José I Illana + Vannia González Macías, José Wudka (UC Riverside) 1 Model 2 Constraints 3 Conclusions JHEP 05 (2016) 171 [160105051]
More informationLeaving Plato s Cave: Beyond The Simplest Models of Dark Matter
Leaving Plato s Cave: Beyond The Simplest Models of Dark Matter Alexander Natale Korea Institute for Advanced Study Nucl. Phys. B914 201-219 (2017), arxiv:1608.06999. High1 2017 February 9th, 2017 1/30
More informationTeV-scale type-i+ii seesaw mechanism and its collider signatures at the LHC
TeV-scale type-i+ii seesaw mechanism and its collider signatures at the LHC Wei Chao (IHEP) Outline Brief overview of neutrino mass models. Introduction to a TeV-scale type-i+ii seesaw model. EW precision
More informationEntropy, Baryon Asymmetry and Dark Matter from Heavy Neutrino Decays.
Entropy, Baryon Asymmetry and Dark Matter from Heavy Neutrino Decays. Kai Schmitz Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany Based on arxiv:1008.2355 [hep-ph] and arxiv:1104.2750 [hep-ph].
More informationMaking Dark Matter. Manuel Drees. Bonn University & Bethe Center for Theoretical Physics. Making Dark Matter p. 1/35
Making Dark Matter Manuel Drees Bonn University & Bethe Center for Theoretical Physics Making Dark Matter p. 1/35 Contents 1 Introduction: The need for DM Making Dark Matter p. 2/35 Contents 1 Introduction:
More informationNeutrino Masses and Dark Matter in Gauge Theories for Baryon and Lepton Numbers
Neutrino Masses and Dark Matter in Gauge Theories for Baryon and Lepton Numbers DPG Frühjahrstagung 014 in Mainz Based on Phys. Rev. Lett. 110, 31801 (013), Phys. Rev. D 88, 051701(R) (013), arxiv:1309.3970
More informationNeutrino Mass Seesaw, Baryogenesis and LHC
Neutrino Mass Seesaw, Baryogenesis and LHC R. N. Mohapatra University of Maryland Interplay of Collider and Flavor Physics workshop, CERN Blanchet,Chacko, R. N. M., 2008 arxiv:0812:3837 Why? Seesaw Paradigm
More informationSOME COMMENTS ON CP-VIOLATION AND LEPTOGENESIS
Marco Drewes TU München 23. 8. 2016, NuFact, Quy Nhon, Vietnam 1 / 7 The Standard Model and General Relativity together explain almost all phenomena observed in nature, but... gravity is not quantised
More informationLeptogenesis in Higgs triplet model
Leptogenesis in Higgs triplet model S. Scopel Korea Institute of Advanced Study (KIAS) Seoul (Korea) Dark Side of the Universe, Madrid,, 20-24 24 June 2006 Introduction Non-zero neutrino masses and mixing
More informationNovember 24, Scalar Dark Matter from Grand Unified Theories. T. Daniel Brennan. Standard Model. Dark Matter. GUTs. Babu- Mohapatra Model
Scalar from November 24, 2014 1 2 3 4 5 What is the? Gauge theory that explains strong weak, and electromagnetic forces SU(3) C SU(2) W U(1) Y Each generation (3) has 2 quark flavors (each comes in one
More informationBaryogenesis and Particle Antiparticle Oscillations
Baryogenesis and Particle Antiparticle Oscillations Seyda Ipek UC Irvine SI, John March-Russell, arxiv:1604.00009 Sneak peek There is more matter than antimatter - baryogenesis SM cannot explain this There
More informationSuccessful Leptogenesis in the Left-Right Symmetric Seesaw Mechanism
Successful Leptogenesis in the Left-Right Symmetric Seesaw Mechanism Pierre Hosteins Patras University 13th November 2007 Brussels P.H., S. Lavignac and C. Savoy, Nucl. Phys. B755, arxiv:hep-ph/0606078
More informationRight-Handed Neutrinos as the Origin of the Electroweak Scale
Right-Handed Neutrinos as the Origin of the Electroweak Scale Hooman Davoudiasl HET Group, Brookhaven National Laboratory Based on: H. D., I. Lewis, arxiv:1404.6260 [hep-ph] Origin of Mass 2014, CP 3 Origins,
More informationLearning from WIMPs. Manuel Drees. Bonn University. Learning from WIMPs p. 1/29
Learning from WIMPs Manuel Drees Bonn University Learning from WIMPs p. 1/29 Contents 1 Introduction Learning from WIMPs p. 2/29 Contents 1 Introduction 2 Learning about the early Universe Learning from
More informationDebasish Borah. (Based on with A. Dasgupta)
& Observable LNV with Predominantly Dirac Nature of Active Neutrinos Debasish Borah IIT Guwahati (Based on 1609.04236 with A. Dasgupta) 1 / 44 Outline 1 2 3 4 2 / 44 Evidence of Dark Matter In 1932, Oort
More informationarxiv: v1 [hep-ph] 28 Dec 2018
December 018 arxiv:181.10914v1 [hep-ph] 8 Dec 018 More stringent constraints on the unitarised fermionic dark matter Higgs portal Shyam Balaji and Archil Kobakhidze ARC Centre of xcellence for Particle
More informationA novel and economical explanation for SM fermion masses and mixings
Eur. Phys. J. C 06) 76:50 DOI 0.40/epjc/s005-06-45-y etter A novel and economical explanation for SM fermion masses and mixings A. E. Cárcamo Hernández a Universidad Técnica Federico Santa María and Centro
More informationProbing the Majorana nature in radiative seesaw models at collider experiments
Probing the Majorana nature in radiative seesaw models at collider experiments Shinya KANEMURA (U. of Toyama) M. Aoki, SK and O. Seto, PRL 102, 051805 (2009). M. Aoki, SK and O. Seto, PRD80, 033007 (2009).
More informationLeptogenesis via varying Weinberg operator
Silvia Pascoli IPPP, Department of Physics, Durham University, Durham DH1 3LE, United Kingdom E-mail: silvia.pascoli@durham.ac.uk Jessica Turner Theoretical Physics Department, Fermi National Accelerator
More informationarxiv: v1 [hep-ph] 16 Mar 2017
Flavon-induced lepton flavour violation arxiv:1703.05579v1 hep-ph] 16 Mar 017 Venus Keus Department of Physics and Helsinki Institute of Physics, Gustaf Hällströmin katu, FIN-00014 University of Helsinki,
More informationRight-handed SneutrinoCosmology and Hadron Collider Signature
Right-handed Sneutrino and Hadron Northwestern University with Andre de Gouvea ( Northwestern) & Werner Porod ( Valencia)... June 15, 2006 Susy 06, UC Irvine Right-handed Sneutrino and Hadron Collider
More informationEffective Theory for Electroweak Doublet Dark Matter
Effective Theory for Electroweak Doublet Dark Matter University of Ioannina, Greece 3/9/2016 In collaboration with Athanasios Dedes and Vassilis Spanos ArXiv:1607.05040 [submitted to PhysRevD] Why dark
More informationA cancellation mechanism for dark matter-nucleon interaction: non-abelian case
A cancellation mechanism for dark matter-nucleon interaction: non-abelian case University of Ioannina 31/3/2018 In collaboration with: Christian Gross, Alexandros Karam, Oleg Lebedev, Kyriakos Tamvakis
More informationBaryon-Dark Matter Coincidence. Bhaskar Dutta. Texas A&M University
Baryon-Dark Matter Coincidence Bhaskar Dutta Texas A&M University Based on work in Collaboration with Rouzbeh Allahverdi and Kuver Sinha Phys.Rev. D83 (2011) 083502, Phys.Rev. D82 (2010) 035004 Miami 2011
More informationAstroparticle Physics and the LC
Astroparticle Physics and the LC Manuel Drees Bonn University Astroparticle Physics p. 1/32 Contents 1) Introduction: A brief history of the universe Astroparticle Physics p. 2/32 Contents 1) Introduction:
More informationMinimal Extension of the Standard Model of Particle Physics. Dmitry Gorbunov
Minimal Extension of the Standard Model of Particle Physics Dmitry Gorbunov Institute for Nuclear Research, Moscow, Russia 14th Lomonosov Conference on Elementary Paticle Physics, Moscow, MSU, 21.08.2009
More informationCreating Matter-Antimatter Asymmetry from Dark Matter Annihilations in Scotogenic Scenarios
Creating Matter-Antimatter Asymmetry from Dark Matter Annihilations in Scotogenic Scenarios Based on arxiv:1806.04689 with A Dasgupta, S K Kang (SeoulTech) Debasish Borah Indian Institute of Technology
More informationNeutrino Masses SU(3) C U(1) EM, (1.2) φ(1, 2) +1/2. (1.3)
Neutrino Masses Contents I. The renormalizable Standard Model 1 II. The non-renormalizable Standard Model III. The See-Saw Mechanism 4 IV. Vacuum Oscillations 5 V. The MSW effect 7 VI. Experimental results
More informationMICROPHYSICS AND THE DARK UNIVERSE
MICROPHYSICS AND THE DARK UNIVERSE Jonathan Feng University of California, Irvine CAP Congress 20 June 2007 20 June 07 Feng 1 WHAT IS THE UNIVERSE MADE OF? Recently there have been remarkable advances
More informationPangenesis in a Baryon-Symmetric Universe: Dark and Visible Matter via the Affleck-Dine Mechanism
Pangenesis in a Baryon-Symmetric Universe: Dark and Visible Matter via the Affleck-Dine Mechanism Kalliopi Petraki University of Melbourne (in collaboration with: R. Volkas, N. Bell, I. Shoemaker) COSMO
More informationGauge U(1) Dark Symmetry and Radiative Light Fermion Masses
UCRHEP-T565 April 2016 arxiv:1604.01148v1 [hep-ph] 5 Apr 2016 Gauge U(1) Dark Symmetry and Radiative Light Fermion Masses Corey Kownacki 1 and Ernest Ma 1,2,3 1 Department of Physics and Astronomy, University
More informationTop quark effects in composite vector pair production at the LHC
Top quark effects in composite vector pair production at the LHC Antonio Enrique Cárcamo Hernández. Universidad Tecnica Federico Santa Maria. SILAFAE 01, 10th-14th of December of 01. Based on: A. E. Cárcamo
More informationGauged U(1) clockwork
Gauged U(1) clockwork Hyun Min Lee Chung-Ang University, Korea Based on arxiv: 1708.03564 Workshop on the Standard Model and Beyond Corfu, Greece, Sept 2-10, 2017. Outline Introduction & motivation Gauged
More informationDark matter and entropy dilution
Dark matter and entropy dilution Miha Nemevšek Goran Senjanović, Yue Zhang 1205.0844 Dark workshop TÜM/IAS, December 2015 Dark Matter stability Discrete symmetries MSSM & R-parity extended Higgs Inert
More informationCosmological Signatures of a Mirror Twin Higgs
Cosmological Signatures of a Mirror Twin Higgs Zackaria Chacko University of Maryland, College Park Curtin, Geller & Tsai Introduction The Twin Higgs framework is a promising approach to the naturalness
More informationThe first one second of the early universe and physics beyond the Standard Model
The first one second of the early universe and physics beyond the Standard Model Koichi Hamaguchi (University of Tokyo) @ Colloquium at Yonsei University, November 9th, 2016. Credit: X-ray: NASA/CXC/CfA/M.Markevitch
More informationBeyond Simplified Models
Pseudoscalar Portal to Dark Matter: Beyond Simplified Models Jose Miguel No King's College London J.M.N. PRD 93 (RC) 031701 (1509.01110) D. Goncalves, P. Machado, J.M.N. 1611.04593 M. Fairbairn, J.M.N.,
More informationarxiv: v2 [hep-ph] 21 Apr 2017
Cosmic abundances of SIMP dark matter Soo-Min Choi, Hyun Min Lee and Min-Seok Seo arxiv:170.07860v [hep-ph] 1 Apr 017 Department of Physics, Chung-Ang University, Seoul 06974, Korea. Center for Theoretical
More informationU(1) Gauge Extensions of the Standard Model
U(1) Gauge Extensions of the Standard Model Ernest Ma Physics and Astronomy Department University of California Riverside, CA 92521, USA U(1) Gauge Extensions of the Standard Model (int08) back to start
More informationThe Standard Model of particle physics and beyond
The Standard Model of particle physics and beyond - Lecture 3: Beyond the Standard Model Avelino Vicente IFIC CSIC / U. Valencia Physics and astrophysics of cosmic rays in space Milano September 2016 1
More information3.5 kev X-ray line and Supersymmetry
Miami-2014, Fort Lauderdale, Florida Bartol Research Institute Department Physics and Astronomy University of Delaware, USA in collaboration with Bhaskar Dutta, Rizwan Khalid and Qaisar Shafi, JHEP 1411,
More informationRelating the Baryon Asymmetry to WIMP Miracle Dark Matter
Brussels 20/4/12 Relating the Baryon Asymmetry to WIMP Miracle Dark Matter PRD 84 (2011) 103514 (arxiv:1108.4653) + PRD 83 (2011) 083509 (arxiv:1009.3227) John McDonald, LMS Consortium for Fundamental
More informationarxiv: v1 [hep-ex] 5 Sep 2014
Proceedings of the Second Annual LHCP CMS CR-2014/199 September 8, 2014 Future prospects of Higgs Physics at CMS arxiv:1409.1711v1 [hep-ex] 5 Sep 2014 Miguel Vidal On behalf of the CMS Experiment, Centre
More informationLHC searches for momentum dependent DM interactions
LHC searches for momentum dependent interactions Daniele Barducci w/ A. Bharucha, Desai, Frigerio, Fuks, Goudelis, Kulkarni, Polesello and Sengupta arxiv:1609.07490 Daniele Barducci LHC searches for momentum
More informationGauged Flavor Symmetries
Gauged Flavor Symmetries NOW 2012 Julian Heeck Max-Planck-Institut für Kernphysik, Heidelberg 15.9.2012 based on J.H., Werner Rodejohann, PRD 84 (2011), PRD 85 (2012); Takeshi Araki, J.H., Jisuke Kubo,
More informationNatural Nightmares for the LHC
Dirac Neutrinos and a vanishing Higgs at the LHC Athanasios Dedes with T. Underwood and D. Cerdeño, JHEP 09(2006)067, hep-ph/0607157 and in progress with F. Krauss, T. Figy and T. Underwood. Clarification
More informationUniversity College London. Frank Deppisch. University College London
Frank Deppisch f.deppisch@ucl.ac.uk University College London 17 th Lomonosov Conference Moscow 20-26/08/2015 Two possibilities to define fermion mass ν R ν L ν L = ν L ν R ν R = ν R ν L Dirac mass analogous
More informationFirst Order Electroweak Phase Transition from (Non)Conformal Extensions of the Standard Model
Syddansk Universitet First Order Electroweak Phase Transition from (Non)Conformal Extensions of the Standard Model Sannino, Francesco; Virkajärvi, Jussi Tuomas Published in: Physical Review D (Particles,
More informationLeptogenesis with Composite Neutrinos
Leptogenesis with Composite Neutrinos Based on arxiv:0811.0871 In collaboration with Yuval Grossman Cornell University Friday Lunch Talk Yuhsin Tsai, Cornell University/CIHEP Leptogenesis with Composite
More informationLeptogenesis from a First-Order Lepton- Number Breaking Phase Transition
Leptogenesis from a First-Order Lepton- umber Breaking Phase Transition Andrew Long TeVPA 2017 at Ohio State University Aug 10, 2017 based on work with Andrea Tesi & Lian-Tao Wang (1703.04902 & JHEP) Bubbles!
More informationINDIRECT DARK MATTER DETECTION
INDIRECT DARK MATTER DETECTION http://www.mpi-hd.mpg.de/lin/research_dm.en.html Ivone Freire Mota Albuquerque IFUSP Inνisibles School - Durham - July 2013 Outline Lecture 1 1. DM indirect searches 2. DM
More informationACCIDENTAL DARK MATTER: A CASE IN SCALE INVARIANT B-L MODEL
THE 4TH KIAS WORKSHOP ON PARTICLE PHYSICS AND COSMOLOGY ACCIDENTAL DARK MATTER: A CASE IN SCALE INVARIANT B-L MODEL ZHAOFENG KANG, KIAS, SEOUL, 10/31/2014 BASED ON AN UNBORN PAPER, WITH P. KO, Y. ORIKAS
More informationDark Forces in the Sky: Signals from Z and the Dark Higgs
Dark Forces in the Sky: Signals from Z and the Dark Higgs Nicole Bell The University of Melbourne with Yi Cai & Rebecca Leane arxiv:1605.09382 (JCAP 2016), arxiv:1610.03063 (JCAP 2017) TEVPA 2017 COLUMBUS
More informationarxiv: v1 [hep-ph] 8 Nov 2018
IPMU18-18 Light Fermionic WIMP Dark Matter with Light Scalar Mediator arxiv:1811.3292v1 [hep-ph] 8 Nov 218 Shigeki Matsumoto (a), Yue-Lin Sming Tsai (b) and Po-Yan Tseng (a) (a) Kavli IPMU (WPI), UTIAS,
More informationSplit Supersymmetry A Model Building Approach
Split Supersymmetry A Model Building Approach Kai Wang Phenomenology Institute Department of Physics the University of Wisconsin Madison UC Riverside HEP Seminar In Collaboration with Ilia Gogoladze (Notre
More informationSUSY AND COSMOLOGY. Jonathan Feng UC Irvine. SLAC Summer Institute 5-6 August 2003
SUSY AND COSMOLOGY Jonathan Feng UC Irvine SLAC Summer Institute 5-6 August 2003 Target Audience From the organizers: graduate students, junior postdocs ¾ experimentalists, ¼ theorists Students enjoy the
More informationNeutrino masses respecting string constraints
Neutrino masses respecting string constraints Introduction Neutrino preliminaries The GUT seesaw Neutrinos in string constructions The triplet model (Work in progress, in collaboration with J. Giedt, G.
More informationperturbativity Pankaj Sharma Based on : arxiv: st September, 2012 Higgs-electroweak precision, vacuum stability and perturbativity
21st September, 2012 PLAN Type II Seesaw Particle Spectrum Vacuum Stabilty and. RG evolution of couplings Electroweak precision data (EWPD). enhancement. Conclusion. A 125 GeV Higgs has been discovered
More informationRecent progress in leptogenesis
XLIII rd Rencontres de Moriond Electroweak Interactions and Unified Theories La Thuile, Italy, March 1-8, 2008 Recent progress in leptogenesis Steve Blanchet Max-Planck-Institut for Physics, Munich March
More informationIMPLICATIONS OF PARTICLE PHYSICS FOR COSMOLOGY
IMPLICATIONS OF PARTICLE PHYSICS FOR COSMOLOGY Jonathan Feng University of California, Irvine 28-29 July 2005 PiTP, IAS, Princeton 28-29 July 05 Feng 1 Graphic: N. Graf OVERVIEW This Program anticipates
More informationThe Story of Wino Dark matter
The Story of Wino Dark matter Varun Vaidya Dept. of Physics, CMU DIS 2015 Based on the work with M. Baumgart and I. Rothstein, 1409.4415 (PRL) & 1412.8698 (JHEP) Evidence for dark matter Rotation curves
More informationScalar field dark matter and the Higgs field
Scalar field dark matter and the Higgs field Catarina M. Cosme in collaboration with João Rosa and Orfeu Bertolami Phys. Lett., B759:1-8, 2016 COSMO-17, Paris Diderot University, 29 August 2017 Outline
More informationCP Violation, Baryon violation, RPV in SUSY, Mesino Oscillations, and Baryogenesis
CP Violation, Baryon violation, RPV in SUSY, Mesino Oscillations, and Baryogenesis David McKeen and AEN, arxiv:1512.05359 Akshay Ghalsasi, David McKeen, AEN., arxiv:1508.05392 (Thursday: Kyle Aitken, David
More informationDark matter and IceCube neutrinos
IL NUOVO CIMENTO 38 C (2015) 31 DOI 10.1393/ncc/i2015-15031-4 Colloquia: IFAE 2014 Dark matter and IceCube neutrinos R. Biondi Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi di L Aquila,
More informationarxiv:hep-ph/ v1 5 Oct 2005
Preprint typeset in JHEP style - HYPER VERSION RITS-PP-003 arxiv:hep-ph/0510054v1 5 Oct 2005 Constraint on the heavy sterile neutrino mixing angles in the SO10) model with double see-saw mechanism Takeshi
More informationarxiv: v1 [hep-ph] 25 Jan 2008
Effects of reheating on leptogenesis arxiv:0801.3972v1 [hep-ph] 25 Jan 2008 F. Hahn-Woernle and M. Plümacher Max Planck Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany Abstract We study
More informationDark Matter and Gauged Baryon Number
Dark Matter and Gauged Baryon Number Sebastian Ohmer Collaborators: Pavel Fileviez Pérez and Hiren H. Patel P. Fileviez Pérez, SO, H. H. Patel, Phys.Lett.B735(2014)[arXiv:1403.8029] P.Fileviez Pérez, SO,
More informationDavison E. Soper Institute of Theoretical Science, University of Oregon, Eugene, OR 97403, USA
Frascati Physics Series Vol. LVI (2012) Dark Forces at Accelerators October 16-19, 2012 DEEPLY INELASTIC DARK MATTER: BEAM DUMPS AS WIMP CANNONS Chris J. Wallace Institute for Particle Physics Phenomenology,
More informationLFV Higgs Decay in Extended Mirror Fermion Model
LFV Higgs Decay in Extended Mirror Fermion Model Chrisna Setyo Nugroho (NTNU) In Collaboration with Chia-Feng Chang (NTU), ChiaHung Vincent Chang (NTNU), and Tzu-Chiang Yuan (AS) KIAS-NCTS Joint Workshop
More informationgeneration Outline Outline Motivation Electroweak constraints Selected flavor constraints in B and D sector Conclusion Nejc Košnik
th Discovery Discovery of of the the 4 4th generation generation Outline Outline Motivation Electroweak constraints Selected flavor constraints in B and D sector Conclusion 1 Introduction Introduction
More informationSearching for sneutrinos at the bottom of the MSSM spectrum
Searching for sneutrinos at the bottom of the MSSM spectrum Arindam Chatterjee Harish-Chandra Research Insitute, Allahabad In collaboration with Narendra Sahu; Nabarun Chakraborty, Biswarup Mukhopadhyay
More informationCosmological constraints on the Sessaw Scale
Cosmological constraints on the Sessaw Scale Jacobo López-Pavón 50th Rencontres de Moriond EW La Thuile, Valle d'aosta (Italy) 14-21 March, 2015 Motivation Which is the simplest extension of the SM that
More informationarxiv:hep-ph/ v1 26 Jul 2006
Neutrino mass and baryogenesis arxiv:hep-ph/0607287v1 26 Jul 2006 D. Falcone Dipartimento di Scienze Fisiche, Università di Napoli, Via Cintia, Napoli, Italy A brief overview of the phenomenology related
More informationEFFECTS OF NEW LEPTONS IN ELECTROWEAK PRECISION DATA
EFFECTS OF NEW LEPTONS IN ELECTROWEAK PRECISION DATA In collaboration with F. del Águila and M. Pérez-Victoria Phys. Rev. D78: 013010, 2008 Depto. de Física Teórica y del Cosmos Universidad de Granada
More informationFalsifying High-Scale Leptogenesis at the LHC
Falsifying High-Scale Leptogenesis at the LHC based on Frank F. Deppisch, JH, Martin Hirsch Phys. Rev. Lett. 112, 221601 (2014), arxiv: 1312.4447 [hep-ph] University College London 21/07/2104 SUSY 2014,
More information