Exploring flavor structure of supersymmetry breaking from rareBdecays and the unitarity triangle

Abstract

We study effects of supersymmetric particles in various rare B decay processes as well as in the unitarity triangle analysis. We consider three different supersymmetric models, the minimal supergravity, SU(5) SUSY GUT with right-handed neutrinos, and the minimal supersymmetric standard model with U(2) flavor symmetry. In the SU(5) SUSY GUT with right-handed neutrinos, we consider two cases of the mass matrix of the right-handed neutrinos. We calculate direct and mixing-induced CP asymmetries in the b → sγ decay and CP asymmetry in B d → φK S as well as the B s -B s mixing amplitude for the unitarity triangle analysis in these models. We show that large deviations are possible for the SU(5) SUSY GUT and the U(2) model. The patterns and correlations of deviations from the standard model will be useful to discriminate the different SUSY models in future B experiments.

Recent measurements of CP asymmetries of B→ϕK0 and B→η′KSEndo1, Mishima2, Yamaguchi3 2005Physics Letters B201100View full textAdd to dashboardCite

“…An interesting observation was made in Ref [6,8,11], pointing out that large SUSY contribution to B → φK is expected in SUSY seesaw models embedded into grand-unified theories (GUTs) where renormalization-group effects above the GUT scale from right-handed neutrino Yukawa couplings can induce CP-violating flavor mixing in the mass squared matrix of scalar superpartners of right-handed down-type quarks. Other possible sources of CP-violating flavor mixing have also been discussed in the literature [13,15,19,22]. Ref.…”

“…On the theoretical side, study has been done in the literature [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] for contributions to B → φK and other modes in the supersymmetric (SUSY) extension of the SM, a promising candidate for physics beyond the SM. An interesting observation was made in Ref [6,8,11], pointing out that large SUSY contribution to B → φK is expected in SUSY seesaw models embedded into grand-unified theories (GUTs) where renormalization-group effects above the GUT scale from right-handed neutrino Yukawa couplings can induce CP-violating flavor mixing in the mass squared matrix of scalar superpartners of right-handed down-type quarks.…”

B, D and K decays

“…In order to illustrate the potential of an SFF to explore the SUSY breaking sector, three SUSY models are considered, and various flavor signals are compared. These are (i) the minimal supergravity model (mSUGRA), (ii) an SU(5) SUSY GUT model with right-handed neutrinos, (iii) the MSSM with U(2) flavor symmetry [1052,1053] ) and B(μ → eγ ) is shown in Fig. 67 for the nondegenerate SU(5) SUSY GUT case.…”

Untitled

“…This ratio can be enhanced up to 10% in NP models with a helicity structure different from the SM [15]. This enhancement is possible even without affecting the rate of b → sγ transitions.…”