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Exploring SUSY models through quark and lepton flavor physics

Exploring SUSY models through quark and lepton flavor physics. Yasuhiro Okada(KEK/Sokendai) June 18, 2008 SUSY 2008, Seoul, Korea. Content of this talk. Quark and lepton flavor physics processes sensitive to the TeV scale physics.

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Exploring SUSY models through quark and lepton flavor physics

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  1. Exploring SUSY models through quark and lepton flavor physics Yasuhiro Okada(KEK/Sokendai) June 18, 2008 SUSY 2008, Seoul, Korea

  2. Content of this talk • Quark and lepton flavor physics processes sensitive to the TeV scale physics. • Study of quark and lepton flavor signals in various cases of SUSY models. T.Goto,Y.O., T.Shindou,M.Tanaka, arXiv:0711.2935

  3. Flavor in the LHC era • LHC will give a first look at the TeV scale physics. The mass of the Higgs boson alone is an important hint for possible new physics scenarios. • Flavor structure of the TeV scale physics is largely unknown. Patterns of the deviations from the SM predictions are a key to distinguish new physics models. • New flavor experiments are coming. LHCb, B physics at ATLAS and CMS, MEG, Super B, etc.

  4. SUSY CP slepton mixing GUT SM has a characteristic feature among various flavor and CP signals. EDM ~0 Lepton flavor Neutrino mixing LFV~0 Quark flavor B,D,K Relationship may be quite different for new physics contributions.

  5. The Unitarity Triangle Even if CKM looksperfect, there are still room for newphysics contributions of at least a few 10’s %. SM global fit Fit by tree level processes

  6. |Vub|, f3/g Bd mixing and CP asymmetries + Bs mixing and CP asymmetries + + eK and B(K->pnn) Improvement on f3/g is essential In order to disentangle new physics effects, we first need to determine the CKM parameter by tree processes. Expected precision LHCb 5-10 deg (2fb-1: 1year) Super B factory 1-2 deg (50-75 ab-1) We know (or constrain) which sector is affected by new physics

  7. New phase b n H- t u Rare B decays: Various tests of new physics • S(B->fKs) Time-dependent CP asymmetry of penguin-dominated processes • A(b->sg) Direct CP asymmetry of b->sg • S(B->K*g) Time-dependent CP asymmetry of B-> K*g • AFB(b->sll), AFB(B->K*g) Forward-backward asymmetry of b->sll, B->K*ll • B(B-> tn),B(B-> Dtn) New phase Right-handed operator charged Higgs exchange

  8. Expected precisions at Super B factory Super KEKB study and SuperB CDR study; 50-75 ab-1 Current results 0.39 ± 0.17 b-s transition 0.61 ± 0.07 0.58 ± 0.20 Charged Higgs error ~0.05-0.06 EW penguin −0.09 ± 0.24 0(10%) physics (Now) => 0(1%) physics (Future) CERN Flavour WS report: arXiv:0801.1833 

  9. Time dep. CP in Bs->J/yf “Bs mixing phase” Time-dep. CPV in Bs-> ff “b-s penguin phase” Time-dep. CPV in Bs->fg “right-handed current” S(Bd->J/y Ks) S(Bd->fKs) S(Bd->K*g) CPV in Bs system at LHCb • Measurement of CP violation in the Bs system is a major goal of the LHCb experiment. • Many are parallel to the Bd system. 2fb-1 (1year) M.Merk,a talk at CERM TH Institute, May 26,2008

  10. m and t Lepton Flavor Violation B( t->mg) • Sensitive to slepton flavor mixings • The MEG experiment will search for B(m->eg) up to 10-13. The current upper bound is 1.2 x 10-11. • One to two orders improvements are expected at a Super B factory for tau LFV searches. S.Banerjee, TAU 06 Super B factory, 50-75 ab-1 arXiv:0801.1833 

  11. SUSY and flavor physics • LHC experiments will be a crucial test for existence of SUSY. (Squark/gluino mass reach 2-3 TeV, A light Higgs boson) • The role of flavor physics is to determine the flavor structure of squark/slepton mass matrixes. (new sources of flavor mixing and CP phases) • Squark/slepton mass matrixes carry information of SUSY breaking mechanism and interactions at high energy scale (ex. GUT/Planck scale). Diagonal tem: LHC/LC Off diagonal term: Flavor Physics

  12. Different assumptions on the SUSY breaking sector Minimal Flavor Violation (ex. mSUGRA) SUSY GUT with see-saw neutrinos SUSY breaking Flavor symmetry Effective SUSY etc. How to distinguish these models from factory observables?

  13. Quark and lepton flavor physics in various SUSY models T.Goto, Y.O. Y.Shimizu, T.Shindou, and M.Tanaka,2002, 2004 T.Goto,Y.O., T.Shindou,M.Tanaka, arXiv:0711.2935 • In order to illustrate how future flavor experiments are useful to distinguish different SUSY models, we calculated various quark and lepton flavor observables in representative SUSY models. Observables • Bd-Bd mixing, Bs-Bs mixing. • CP violation in K-K mixing (e). • Time-dependent CP violation in B ->J/yKs, B->fKs, B->K*g ,B->rg. • Direct CP violation in b->s g,b->dg • m->eg, t->mg, t->eg • Models • 1. Minimal supergravity model (mSUGRA) • 2. SUSY seesaw model • 2. SU(5) SUSY GUT with right-handed neutrino • MSSM with U(2) flavor symmetry

  14. mSUGRSA with GUT/Seesaw Yukawa interaction Yukawa interactions at the GUT scales induce quark and lepton flavor signals. In the SU(5) setup, the right-handed sdown sector can receive flavor mixing due to the neutrino Yukawa couplings. Neutrino Yukawa coupling Quark Yukawa coupling Interactions at GUT/seesaw scale Lepton flavor violation in m->eg t->mg t->eg Quark flavor signals Time-dep CP asymmetries in B->fKs B -> K*g Bs->J/yf L.J.Hall,V.Kostelecky,S.Raby,1986;A.Masiero, F.Borzumati, 1986, R.Barbieri,L.Hall,1994, R.Barbieri,L.Hall.A.Strumia, 1995, S.Baek,T.Goto,Y.O, K.Okumura, 2001;T.Moroi,2000; A.Masiero, M.Piai,A Romanino, L.Silvestrini,2001 D.Chang, A.Masiero, H.Murayama,2003 J.Hisano,and Y.Shimizu, 2003, M.Ciuchini, et.al, 2004, 2007…

  15. Effects of the neutrino Yukawa coupling Neutrino mass matrix (in the basis where yl is diagonal). LFV mass terms for slepton (and sdown). LFV mass terms and VPMNSis directly related when (Minimal LFV) Large solar mixing angle=> m->eg enhanced

  16. If is somewhat suppressed, the B(m->eg) constraint becomes weaker, and a variety of flavor signals are possible. • Non-degenerate MN J.Casas, A.Ibarra2001; J.Ellis,J.Hisano,M.Raidal,Y.Shimizu, 2002 • Degenerate MN, but inverse hierarchy or degenerate light neutrino with q13~0. We consider various cases for heavy neutrino and light neutrino mass hierarchy.

  17. Degenerate MN (=4x1014 GeV) q13 =0 SUSY Seesaw model (without GUT) Normal hierarchy Degenerate (mn1=0.1eV) Inverse hierarchy t->mg m->eg t-eg m-eg is promising signal in the normal hierarchy case, and t->mg can be also large in other cases : Recent related works: L.Calibim, A.Faccica A.Masiero, S.K.Vepati, 2006 L.Calibim, A.Faccica A.Masiero, 2006

  18. SU(5) SUSY GUT Degenerate MN and “Normal hierarchy” for light neutrinos : B(m->eg) can be close to the present bound even if the slepton mass is 3 TeV. Contour in the m0 -M1/2 plane m->eg, t->mg,t->eg branching ratios m->eg bound

  19. Lepton Flavor Violation in the non-degenerate MN case t->mg t->mg, t->eg vs. m->eg B(t->mg) B(m->eg) m->eg t->eg

  20. Time-dependent CP violation in Bd decays S(Bd->K*g) DS= S(B->fKs)-S(B->J/yKs) Super B Super B These asymmetries can be sizable if the squarks are within the LHC reach.

  21. Time-dependent CP asymmetry in Bs -> J/yf S(Bs->J/yf) S(Bs->J/yKs) vs. B(t->mg) SuperB LHCb Recent works on Bs mixing: J.K. Parrym H-H. Zhong 2007; B.Dutta, Y.Mimura2008; J.Hisano Y.Shimizu, 2008.

  22. MSSM with U(2) flavor symmetry A.Pomarol and D.Tommasini, 1996; R.Barbieri,G.Dvali, and L.Hall, 1996; R.Barbieri and L.Hall; R.Barbieri, L.Hall, S.Raby, and A.Romonino; R.Barbieri,L.Hall, and A.Romanino 1997; A.Masiero,M.Piai, and A.Romanino, and L.Silvestrini,2001; …. • The quark Yukawa couplings and the squark mass terms are governed by the same flavor symmetry. • 1st and 2nd generation => U(2) doublet 3rd generation => U(2) singlet We do not consider LFV processes in this model

  23. Various CP asymmetries are possible for the b-s and b-d transitions in the U(2) model A( b->sg) S(Bd->K*g) S(Bd->rg) S(Bs->J/yf)

  24. LFV b-s and b-d transitions Summary table of flavor signals for mSUGRA, SUSY seesaw, SUSY GUT, MSSA with U(2) flavor symmetry Pattern of deviation from the SM predictions are different for various cases considered.

  25. Conclusions • We have performed a comparative study on quark and lepton flavor signals for representative SUSY models; mSUGRA, MSSM with right-handed neutrinos, SU(5) SUSY GUT with right-handed neutrinos, and U(2) models. • Each model predicts a different pattern of the deviations from the SM in b-s and b-d quark transition processes and muon and tau LFV processes. • These signals can provide important clues on physics at very high energy scales if SUSY particles are found at LHC.

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