Search for New Physics Beyond the SM. Shufang Su U. of Arizona

Transcription

1 Search for New Physics Beyond the SM DOE Review 2010 Shufang Su U. of Arizona Copyright S. Su CERN DOE Review, 2010 (Photo courtesy of Maruša Bradač.)

2 My work focuses on searching for new physics beyond the SM S. Su DOE Review,

3 My work focuses on searching for new physics beyond the SM Involve experiments in Nuclear physics Particle physics Astrophysics/Cosmology S. Su DOE Review,

4 My work focuses on searching for new physics beyond the SM Involve experiments in Nuclear physics Particle physics Astrophysics/Cosmology Direct Searches S. Su DOE Review,

5 My work focuses on searching for new physics beyond the SM Involve experiments in Nuclear physics Particle physics Astrophysics/Cosmology Direct Searches Indirect Searches S. Su DOE Review,

6 My work focuses on searching for new physics beyond the SM Involve experiments in Nuclear physics Particle physics Astrophysics/Cosmology Dark Matter Direct Searches Indirect Searches S. Su DOE Review,

7 Students and Postdoc Postdocs Brooks Thomas (group postdoc, ) Univ. of Hawaii Vikram Rentala (group postdoc, 2010 now) Graduate Students Ethan Dolle (graduated Jan, 2010) Xinyu Miao (passed thesis defense, Oct, 2010) Jonathan Eckel (3rd year) Undergraduate Students Jessica Goodman Univ. of California, Irvine, particle theory Will Parker Univ. of Wisconsin, Madison, CMS group Kara Farnsworth Univ. of California, Davis, particle theory James Kieler S. Su DOE Review,

8 Dark Matter S. Su DOE Review,

9 Inert Higgs Doublet Model Dark Matter in the Inert Higgs Doublet Model E. Dolle (U. of Arizona) The Inert Dark Matter E. Dolle and S. Su, Phys. Rev. D 80 (2009) Introduce another Higgs field that only couples to gauge sector impose Z2 parity: SM particles +, extra Higgs: ( ) H H 1 = H + SM H 2 = (S + ia)/ 2 lightest one: DM candicate S. Su DOE Review,

10 Dark Matter Studies! L !0.1!0.2!0.3!0.4! _50_ m S [GeV]! L !0.1!0.2!0.3! _1_1! m [GeV] S blue curves) in m S λ L plane for m h =120 GeV. FIG. 7: WMAP 3σ allowed region (enclosed by bl (50, 10) GeV (left plot) and (50,8) GeV (right The mass splittings are chosen to be (δ 1, δ 2 ) = (1, 1 P I+II searches (yellow, light shade), electroweak region are excluded by vacuum stability while he S. Su DOE Review, rk matter direct detection (purple, mediumdark constraints. bottom), and perturbativity (hatched region).

11 Direct Searches S. Su DOE Review,

12 Inert Doublet Model Collider Signatures in the Inert Doublet Model E. Dolle, X. Miao, B. Thomas (U. of Arizona) Dilepton Signals of Dark Matter in the IHDM E. Dolle, S. Su, B. Thomas, X. Miao, arxiv: , PRD 81 (035003), W (*) H ± A + Z (*) +W (*) pp SA SSZ ( ), SSW ( ) W ( ) S Signatures: jets + leptons + missing ET S. Su DOE Review,

13 Dilepton Signals Signal: pp SA SSZ SSl + l, l=e,µ LH2: ms = 40 GeV, (δ1, δ2)=(70,70) GeV Mll < 70 GeV #!! #!!# WW ZZ/γ t t W Z/γ SA & dσ dmll/1gev 1 σ #!!% WW SA t t #!!$ & W Z/γ ZZ/γ! "! #!! #"! M ll (GeV) S. Su DOE Review,

14 Direct Searches Signal: pp SA SSZ SSl + l, l=e,µ Level III Cuts Benchmark σ SA σ H + H σ hz σ WW σ ZZ/γ σ t t σ W Z/γ σ Wt σbg comb (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) S/B S/ B LH LH LH LH LH HH HH HH S. Su DOE Review,

15 Direct Searches Signal: pp SA SSZ SSl + l, l=e,µ Level III Cuts Benchmark σ SA σ H + H σ hz σ WW σ ZZ/γ σ t t σ W Z/γ σ Wt σbg comb (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) S/B S/ B LH LH LH LH LH HH HH HH S. Su DOE Review,

16 Direct Searches Signal: pp SA SSZ SSl + l, l=e,µ Level III Cuts Benchmark σ SA σ H + H σ hz σ WW σ ZZ/γ σ t t σ W Z/γ σ Wt σbg comb (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) LH2: ms = 40 GeV, (δ1, δ2)=(70,70) GeV S/B S/ B LH LH LH LH LH HH HH HH S. Su DOE Review,

17 Direct Searches Signal: pp SA SSZ SSl + l, l=e,µ Level III Cuts Benchmark σ SA σ H + H σ hz σ WW σ ZZ/γ σ t t σ W Z/γ σ Wt σbg comb (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) (fb) S/B S/ B LH LH LH LH LH HH HH HH S. Su DOE Review,

18 Trilepton Signals Signal: pp H ± A SSWZ SSlllν, l=e,µ S. Su, B. Thomas, X. Miao, arxiv: , PRD 82 (082009), 2010 LH3: ms = 82 GeV, (δ1, δ2)=(50,50) GeV 10 0 t t(j) W Z/γ AH ± 10 0 t t(j) W Z/γ AH ± dσ dmlz lz /5GeV 10!1 AH ± t t(j) WZ/γ dσ dmt W /5GeV 10!1 WZ/γ 1 σ 1 σ AH ± t t(j) 10! M lz l z (GeV) 10! M TW (GeV) S. Su DOE Review,

19 Trilepton Signals Signal: pp H ± A SSWZ SSlllν, l=e,µ Level III Cuts Benchmark σ H ± A σ W Z/γ σ t t(j) σ Wt(j) σ comb BG S/B S/ B (fb) (fb) (fb) (fb) (fb) (300 fb 1 ) LH LH LH LH LH LH ± ± S. Su DOE Review,

20 Trilepton Signals Signal: pp H ± A SSWZ SSlllν, l=e,µ Level III Cuts Benchmark σ H ± A σ W Z/γ σ t t(j) σ Wt(j) σ comb BG S/B S/ B (fb) (fb) (fb) (fb) (fb) (300 fb 1 ) LH LH LH LH LH LH ± ± S. Su DOE Review,

21 Trilepton Signals Signal: pp H ± A SSWZ SSlllν, l=e,µ Level III Cuts Benchmark σ H ± A σ W Z/γ σ t t(j) σ Wt(j) σbg comb S/B S/ B (fb) (fb) (fb) (fb) (fb) (300 fb 1 ) LH LH2: ms = 40 GeV, (δ1, δ2)=(70,70) 0.191GeV LH LH LH LH LH ± ± S. Su DOE Review,

22 Trilepton Signals Signal: pp H ± A SSWZ SSlllν, l=e,µ Level III Cuts Benchmark σ H ± A σ W Z/γ σ t t(j) σ Wt(j) σ comb BG S/B S/ B (fb) (fb) (fb) (fb) (fb) (300 fb 1 ) LH LH LH LH LH LH ± ± S. Su DOE Review,

23 Exotic 4th Generation Mirror Quark Exotic 4th generation mirror quarks J. Alwall (National Taiwan Univ.), J. Feng (UCIrvine), J. Kumar (Univ. of Hawaii) DMMotivated Searches for Exotic 4th Generation Mirror Quarks at the Tevatron and Early LHC Data J. Alwall, J. L. Feng, J. Kumar, S. Su, PRD81 (114027), 2010 S. Su DOE Review,

24 Exotic 4th Generation Mirror Quark chiral under SM gauge group Exotic 4th generation mirror quarks J. Alwall (National Taiwan Univ.), J. Feng (UCIrvine), J. Kumar (Univ. of Hawaii) DMMotivated Searches for Exotic 4th Generation Mirror Quarks at the Tevatron and Early LHC Data J. Alwall, J. L. Feng, J. Kumar, S. Su, PRD81 (114027), 2010 S. Su DOE Review,

25 Exotic 4th Generation Mirror Quark chiral under SM gauge group same charge opposite chirality Exotic 4th generation mirror quarks J. Alwall (National Taiwan Univ.), J. Feng (UCIrvine), J. Kumar (Univ. of Hawaii) DMMotivated Searches for Exotic 4th Generation Mirror Quarks at the Tevatron and Early LHC Data J. Alwall, J. L. Feng, J. Kumar, S. Su, PRD81 (114027), 2010 S. Su DOE Review,

26 Exotic 4th Generation Mirror Quark chiral under SM gauge group charge under hidden symmetry same charge opposite chirality Exotic 4th generation mirror quarks J. Alwall (National Taiwan Univ.), J. Feng (UCIrvine), J. Kumar (Univ. of Hawaii) DMMotivated Searches for Exotic 4th Generation Mirror Quarks at the Tevatron and Early LHC Data J. Alwall, J. L. Feng, J. Kumar, S. Su, PRD81 (114027), 2010 S. Su DOE Review,

27 4th Generation Mirror Quark Dark Matter: longlived on cosmological time scale Charge under a new unbroken symmetry absolutely stable have only gravitational interaction with the SM can not be discovered at colliders couple to SM through connector Y YY production with y f X X Y f DM connector SM S. Su DOE Review,

28 4th Generation Mirror Quark Dark Matter: longlived on cosmological time scale Charge under a new unbroken symmetry absolutely stable have only gravitational interaction with the SM can not be discovered at colliders couple to SM through connector Y YY production with y f X X Y f DM connector SM SM charge & dark charge S. Su DOE Review,

29 4th Generation Mirror Quark Dark Matter: longlived on cosmological time scale Charge under a new unbroken symmetry absolutely stable have only gravitational interaction with the SM can not be discovered at colliders couple to SM through connector Y YY production with y f X X Y f DM connector SM SM charge & dark charge SUSY neutralino squark quark Rparity ExD KK gauge boson KK quark quark KKparity Our study DM(no SM charge) exotic quark quark dark charge S. Su DOE Review,

30 4th Generation Mirror Quark Y particle appears as exotic 4th generation mirror quarks Q DM p Qʼ q DM Collider Signal T T ttxx, B B bbxx p Qʼ q Signal: T T t ( ) X t ( ) X bw + X bw X S. Su DOE Review,

31 4th Generation Mirror Quark (GeV) m X Exclusion for T T! t X t m T = m X + m t 20 fb 1 10 fb 1 5 fb X at the Tevatron Hadronic channel 1 (GeV) m X Discovery for T T! t X t m T = m X + m t X at 10 TeV LHC Hadronic channel pb pb fb pb m T (GeV) m T (GeV) S. Su DOE Review,

32 4th Generation Mirror Quark (GeV) m X Exclusion for T T! t X t m T = m X + m t 20 fb 1 10 fb 1 5 fb X at the Tevatron Hadronic channel 1 (GeV) m X Discovery for T T! t X t m T = m X + m t X at 10 TeV LHC Hadronic channel pb pb fb pb m T (GeV) B B at Tevatron and LHC m T (GeV) J. Alwall, J. L. Feng, J. Kumar, S. Su, in preparation S. Su DOE Review,

33 SUSY Golden Region Sbottom searches H. Li (Shandong Univ.), W. Parker (U. of Wisconsin, Madison), Z. Si (Shandong Univ.) Sbottom Signatures of Supersymmetric Golden Region H. Li, W. Parker, Z. Si, S. Su, arxiv: , submitted to PLB. LEP Higgs search limit: mhsm > % C.L. MSSM: mh < tree level, receive large loop corrections from stop large m stop is needed, fine tuning in EWSB. SUSY golden region: small μ, small mq3, mu3, large At m Q3 m u3 m d3 A t µ m A tan β M 1 M 2 M 3 m q m l S. Su DOE Review,

34 SUSY Golden Region Benchmark m t 1 m t 2 m m b1 χ 0 1 m χ 0 2 m χ ± m 1 h 0 m H 0 m A m H ± Signature: pp b 1 b 1 2j b + 2 jets+ 1 lepton + E T. process σ i (fb) N total cuti(%) cutii(%) cutiii(%) σ III (fb) cutiv(%) σ IV (fb) b1 b t t t tw t tz W Zjj W W jj W jjjj f S/ B 5.3 S/ B 5.8 S/B 0.05 S/B 0.18 f S. Su DOE Review,

35 Leptophillic Higgs Leptophilic Higgs B. Thomas (U. of Arizona) H µµ in tth at the LHC B. Thomas, S. Su, Phys. Lett. B 677 (2009) 296. The LHC discovery potential of a leptophilic Higgs B. Thomas, S. Su, Phys. Rev. D79 (2009) Statistical Significance tth(h" bb) gg" h " ## WBF(h" WW) h" ZZ h" WW 5! Statistical Significance WBF(h" ##) tth(h" ##) gg" h " ## WBF(h" µµ) tth(h" µµ) gg" h " µµ 5! 10 1 L2HDM L=30 fb 1 L2HDM L=30 fb S. Su DOE Review, m 19 m h (GeV) h (GeV) 10 1

36 Simplified Model Approach LHC topology: simplified model approach A. Freitas (U. of Pittsburgh), V. Rentala (Univ. of Arizona) Most of current study Model dependent, parameter dependent Losses in sensitivity for more general scenarios Existing results difficult to translate into results for more general models Simplified model approach Limits of a more complete new physics scenarios Relevant topologies are more transparent Kinematic boundaries are easy to make manifest Results are easier to translate into other models S. Su DOE Review,

37 τ+τ LHC topology: simplified model approach A. Freitas (U. of Pittsburgh), V. Rentala (Univ. of Arizona) τ+τ resonance A. Freitas, S. Su, submitted to working group contribution 1 0,1,2 0. L = 1 2 µa 0 µ A m2 A(A 0 ) 2 + ic τ τa 0 γ 5 τ + ic b ba 0 γ 5 b + c G Λ A A 0 G µν Gµν, Σ pp Φ BR Φ ΤΤ pb 100 LHC 7 ma, σ(pp A), Br(A ττ) Cb CGm Φ GeV S. Su DOE Review,

38 l+l+ l+l+ resonance V. Rentala, S. Su, in preparation 1 0,1,2 2 H ++ in a singlet Φ = H ++ :(T =0,T 3 =0,Y= 2). H ++ in a doublet Φ = H ++ in a triplet Φ = H++ H + : (T =1/2, T 3 =1/2, Y=3/2) H+ / 2 H 0 H ++ H + / 2 : (T =1,T 3 =1,Y= 1). Production: Drellyan pair production two photon fusion mh++, σ, Br(H ++ l + l + ) S. Su DOE Review,

39 l+l+!(h ++ H!! )" Br 2 (H ±± # l ±± l $±± ) (fb) Tevatron Singlet # % Triplet % Doublet D0 µµ CDF ee CDF eµ CDF e& CDF µ& m ++ H (GeV) "(H ++ H!! )# Br 2 (H ±± $ l ±± l %±± ) (fb) LHC 7 TeV Triplet Doublet Singlet 10! m ++ H (GeV) S. Su DOE Review,

40 Other direct searches Slepton Discovery via neutralino/chargino pair production M. RamseyMusolf (U. of Wisconsin, Madison), W. Shepherd (Northwestern and UC Irvine) S. Su DOE Review,

41 Indirect Searches for New Physics S. Su DOE Review,

42 Indirect Searches Energy frontier: LHC Precision (intensity) frontier: low energy precision measurements Q e W Jlab Moller Qweak Cs APV SLAC E158 NuTeV Standard Model Prediction Erler, Kurylov & RamseyMusolf, Phys. Rev. D 72, (2005) PVDIS S. Su DOE Review,

43 Indirect Searches Low Energy Precision Supersymmetry M. RamseyMusolf (UW Madison) Kion Leptonic Decay and Supersymmetry M. RamseyMusolf, S. Su, in preparation. S. Su DOE Review,

44 Indirect Searches Likesign Dilepton Asymmetry in $B$ Meson System B. Thomas (Univ. Hawaii) New Physics Contributions to Likesign Dilepton Asymmetry in $B$ System B. Thomas, S. Su, in preparation. S. Su DOE Review,

45 Other Activities S. Su DOE Review,

46 Organization of conferences/workshops Organizer for KITPC 2011 program: Dark matter and new physics, Sep 21st Nov 6, Organizer for Frontier Physics Working Month, INPAC, May 24 June 18, Convener for LCWS 2010, session on SUSY and New Physics at the Terascale. Organizer for Aspen 2009 Summer Program: Beyond the Standard Model Physics at the Threshold S. Su DOE Review,

47 Organization of conferences/workshops Convener for ALCPG09, physics working group: Charged Particle Momentum Mesurement, V0 Reconstruction, and Identification of Stable Charged Particles Convener for muon collider workshop (09), physics working group: Higgs Physics Serve as coordinator for the group: Connection to Astro and Cosmo of LHC wiki page ( S. Su DOE Review,

48 Future Plans Collider related physics: understand what data really means Communicate (more) with our exp neighbour (LHC/ ALTAS, D0) Train students to work on collider (LHC) physics simulation tools for new physics and SM background experimental physics observables/ capabilities New physics phenomenology / distinguish various new physics Connection to cosmology New candidate for dark matter Collider studies of dark matter properties S. Su DOE Review,

49 !ank y"! S. Su DOE Review,