Yasunori Nomura. UC Berkeley; LBNL. hep-ph/ [PLB] hep-ph/ [PLB] hep-ph/ [PRD] Based on work with Ryuichiro Kitano (SLAC)
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1 Yasunori Nomura UC Berkeley; LBNL Based on work with Ryuichiro Kitano (SLAC) hep-ph/ [PLB] hep-ph/ [PLB] hep-ph/ [PRD]
2 We will be living in the Era of Hadron Collider Exploring highest energy regime Connections between signals and the underlying theory not so obvious Input from models very important Determination of TeV physics through (slow) elimination processes What contributions can theorists make? Suggest new signals Give a list of well-motivated models to be tested From what models should we start? Minimality, Consistent with the existing (initial LHC) data,
3 Naturalness as a Guiding Principle (still) Why m weak << M Pl? Need some new particles at ~ TeV Weak scale supersymmetry Improved radiative structure (EWSB, inflation, ) Gauge coupling unification Theory of EWSB: radiative EWSB with large mt Relatively easy to evade constraints from EWPD Still leads to vast varieties of signatures Need to specify more
4 More Powerful Use of Naturalness after LEPII EWSB does not work well in the (simplest) minimal supersymmetric standard model (MSSM) Supersymmetric fine-tuning problem Minimization condition (tree level) In general, Natural EWSB requires In the MSSM,
5 There are several contributions to m h 2 The largest contribution: top-stop loop M mess : the scale where superparticle masses are generated Light top squarks and small messenger scale preferred What s wrong? M Higgs < M Z at tree level need radiative corrections from top-stop loop Tension between small M mess and the SUSY flavor problem mediating SUSY breaking by SM gauge interactions
6 Suggests Several Directions to Go Additional contribution to M Higgs and random superparticle masses at low energies Chacko, Y.N., Smith; Y.N., Tweedie, Add W = S Hu Hd Generate soft masses at (10~100)TeV by strong dynamics The strong sector has an SU(5) global symmetry, but it is spontaneously broken at (10~100 TeV) as well as SUSY keeping gauge coupling unification Explicit construction in warped space
7 The Higgs boson may have escaped the detection at LEP II The Higgs boson may decay into complicated final states e.g. h aa t t t t or h aa g g g g (a: new scalar) Complete discussion of tuning needs an underlying theory, but the tension with M Higgs alleviated Large A t term allows the reduction of stop masses; combined with small M mess can solve the problem The fine-tuning problem may just be a problem of SUSY breaking mechanism, and not minimal SUSY itself M Higgs at tree level must be reasonably large Moderately large tanb small mb Dermisek, Gunion; Chang, Fox, Weiner Complete analysis needed (including all the sensitivities of v) Kitano, Y.N.
8 Naturalness as a model selector The SUSY fine-tuning problem may just be a problem of SUSY breaking mechanism, and not minimal SUSY itself Large A t term allows light top squarks, alleviating tuning Minimal values of giving M Higgs 114.4GeV Kitano, Y.N., hep-ph/ For, is allowed (for )
9 The effect of A t already visible at CMSSM Further reduction of tuning possible via non-universality e.g.
10 Reduction of tuning to the level of 10% possible in high scale supersymmetry breaking Typically,,, Further reduction of tuning requires small M mess : Small M mess with Large A t Moduli / Boundary condition / Scherk-Schwarz SUSY breaking e.g. Well-ordered spectra reduce/eliminate tuning
11 Emerging Pictures Generic features of natural SUSY models Large A t term: large top squark mass splitting Light top squarks How light depends on M mess etc. (For the high scale case, ) Light Higgs boson Typically, Small mb ( O.K. for M mess ~ TeV ) Typically, Small mparameter ( for )
12 Characteristic Spectra (a) squeezed spectra (typical in the high scale case) (b) well-ordered spectra (typical in moduli-type) None of these particularly well studied
13 A Solution to the SUSY Fine-tuning Problem within the MSSM Is there any region where fine-tuning is absent? Requires a careful analysis Consistent with various constraints? No hidden fine-tuning? Need to specify the model Large A t at low energies Kitano, Y.N., PLB631, 58 (05) (Z+Z + )Q + Q moduli supersymmetry breaking (Z T) Special RG properties Choi, Jeong,Kobayashi,Okumura; Kitano, Y.N.
14 Single moduli dominance Effective supergravity action at ~M unif kinetic function, : superspace function, : superpotential, : gauge : introduced to allow L=0 at the minimum where is MSSM Yukawa coupling. (w 0 ~m 3/2 M unif2, A~M unif3, a~8p 2 /N, n 0 =3 and r i =n i /n for volume moduli)
15 Moduli stabilization (supersymmetrically) e.g. Kachru, Kallosh, Linde, Trivedi; at the leading order in. ( ) M 0 : moduli contribution to the soft masses Relation between M 0 and m 3/2 (Moduli)~(Anomaly) Mixed moduli-anomaly mediation Choi, Falkowski, Nilles, Olechowski, Pokorski; Endo, Yamaguchi, Yoshioka;. ratio : a rational number (plus corrections; see later)
16 RG properties of soft masses Suppose and for fields having, the soft masses defined by can be solved (at one loop) as M mess is defined by Choi, Jeong, Okumura; Simple proof: Kitano, Y.N. M mess : effective messenger scale ( ) Is the reduction of M mess real? No hidden fine-tuning?
17 M mess ~ TeV obtained by a=2? a is a rational number, up to corrections The corrections arise from terms of higher order in. Although is O(1), coefficients can be O(1/8p 2 ). a=2 can be obtained without fine-tuning Assignment for r i (respecting RG properties) SU(5) Matter universality arises e.g. in 6D with 5D matter and 4D Higgses (Technically natural)
18 Soft SUSY breaking masses at M mess ~ TeV: Corrections of O(M 02 /8p 2 ) expected for the scalar squared masses, arising from higher order terms in (flavor universality assumed). These corrections are naturally smaller than ~ v 2 : Correction to through negligible even with treated as free parameters at M mess (We aim D -1 > 20%)
19 mand B parameters Naturally O(m 3/2 ) = O(100 TeV) too large We need Consider a field S having only the F-term VEV, F S ~ M 0, and This gives at m ~ M 0 = O( GeV) naturally obtained Too large B? B = 0 at m R = M mess Small B also obtained naturally
20 EWSB without Fine-Tuning Is there a region with D -1 > 20%? M 0 bounded from below by M Higgs > 114 GeV and from above by D -1 > 20% EWSB M 0 > 550 GeV (450 GeV) for tanb = 10 (30) M 0 < 900 GeV There is a parameter region with D -1 > 20%
21 Spectrum Summary Universal masses at M mess ~ TeV, where Top squark masses light and split Light Higgs boson(s) (Moderately) large tanb and The lighter top squark mass as small as ~ 200 GeV The Higgsino LSP
22 Signatures at the LHC Characteristic Signatures for the well-ordered spectra Higgsino LSP at the LHC close in mass Kitano, Y.N., hep-ph/ produced by decay: Small M ll endpoint Shape determined by the Higgsino nature of the LSP (different from gauginos close in mass)
23 All relevant masses determined Use despite short cascades Fit M ll, M llq, M T2, M jj (M eff )
24 Determine,,, and at a few to ten percent level. Model Discrimination Possible
25 Dark Matter (before the LHC?) The lighter neutral Higgsino is the LSP ( ) Nonthermally produced e.g. Moduli gravitino LSP Direct detection t-channel Higgs boson exchange Kitano, Y.N., PLB632, 162 (06) Relevant parameters: bounded! Contributions from h and H 0 exchange are constructive (destructive) for sgn(m) > 0 (< 0) Solid lower bound on s (SI cross section) ~ obtained for m> 0!
26 The sign of mdetermined from b sg The rate for b sg depends highly on sgn( m), sgn(a t ) Contributions from chargino and charged Higgs boson loops interfere destructively (constructively) for m> 0 (< 0) m> 0 is chosen (also preferred from a m )
27 Detection at CDMSII promising A part of the relevant parameter space already excluded A large portion will be covered by the end of 2007
28 Summary Naturalness (still) important guiding principle Use it as a powerful model selector (became possible after LEP II) What realization of SUSY at ~ TeV? squeezed spectra well-ordered spectra Mixed moduli-anomaly mediation (mirage) eliminate fine-tuning LHC and dark matter signatures Higgsino LSP degenerate spectrum (model discrimination)
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