Atmospheric neutrinos can make beauty strange

Abstract

The large observed mixing angle in atmospheric neutrinos, coupled with Grand Unification, motivates the search for a large mixing between right-handed strange and bottom squarks. Such mixing does not appear in the standard CKM phenomenology, but may induce significant b → s transitions through gluino diagrams. Working in the mass eigenbasis, we show quantitatively that an O(1) effect on CP violation in B 0 d → φK S is possible due to a large mixing betweeñ s R andb R , while still satisfying constraints from b → sγ. We also include the effect ofb L -b R mixing proportional to m b µ tan β. In the case where m b µ tan β ≪ M 2 SU SY there may be a large effect in B s mixing correlated with a large effect in B 0 d → φK S , typically yielding an unambiguous signal of new physics at Tevatron Run II.

The soft supersymmetry-breaking Lagrangian: theory and applications

“…The reported asymmetry is 2.7σ away from this value, although the error bars are large. Several recent analyses have studied this situation, both in model-dependent and model-independent analyses [241,242,243,244,245]. §…”

Single top quark production via SUSY-QCD FCNC couplings at the CERN LHC in the unconstrained MSSM

“…However, when the off-diagonal elements in the up squark mass matrix become large, the mass insertion approximation is no longer valid [19,20]. Therefore, we use the general mass eigenstate formalism as described above, which has been adopted in the literatures recently [10,19,20].…”

“…Thus, as shown in Ref. [10,19,20], it is reasonable to calculate the observables by only switching on one off-diagonal element in (M 2 U ) LL , (M 2 U ) LR and (M 2 U ) RR at a time. For the aim of this paper, the following strategy in the calculations of the process pp → tc(ū) will be used: first we deal with the LL, LR, RL and RR block of the matrix M 2 U separately and in each block we only consider the effects of individual element on the production cross sections, and then we investigate both the interference effects between different entries within one block and the interference effects between different blocks.…”

“…As we know, most of the works within SUSY models are limited in some constrained MSSM, where the top quark FCNC couplings were studied through some SUSY-CKM matrices or mass insertion approximation [18]. However, it is interesting to study the top quark FCNC productions using soft SUSY broken parameters directly, and then establish some relations between the production cross sections and soft SUSY broken parameters in the mass eigenstate formalism [19,20]. Actually, the general framework with SUSY FCNC mechanisms was presented several years ago [21], and there have been a lot of works studying SUSY FCNC processes within this framework [19,20].…”

“…However, it is interesting to study the top quark FCNC productions using soft SUSY broken parameters directly, and then establish some relations between the production cross sections and soft SUSY broken parameters in the mass eigenstate formalism [19,20]. Actually, the general framework with SUSY FCNC mechanisms was presented several years ago [21], and there have been a lot of works studying SUSY FCNC processes within this framework [19,20]. But the top quark SUSY FCNC production processes have not been studied in above framework so far, and this means that the relations between the observables of the top quark production processes and the mixing among up squarks involving the third generation have not been established yet.…”