Flavor violating processes with sgoldstino pair production

作者：Demidov S V^*; Gorbunov D S

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, 85(7): 077701.

DOI：10.1103/PhysRevD.85.077701

In supersymmetric extensions of the standard model of particle physics (SM), goldstino superpartners-scalar and pseudoscalar sgoldstinos-can be light enough for emerging in decays of SM particles. Sgoldstino interaction with SM fields is suppressed by the scale of supersymmetry breaking in the whole theory. Hence, searches for sgoldstinos give an opportunity to probe the underlying mechanism of supersymmetry breaking. Sgoldstino couplings to SM fields are proportional to the supersymmetry breaking parameters-MSSM soft terms-and therefore can lead to flavor violating processes in quark and lepton sectors. We consider flavor violating processes involving sgoldstino pair production which are driven by sgoldstino couplings proportional to squark and slepton soft mass terms, (m) over tilde (2)(LL) and (m) over tilde (2)(RR). We find that present limits on off-diagonal entries in squark and slepton squared mass matrices allow t-, b-, c-quark and tau-lepton decays at levels available for study with existing data (BaBar, Belle, CLEOc) and in ongoing experiments (LHCb, CMS, ATLAS). In particular, we obtain the following branching ratios Br(t -> cSP) less than or similar to 10(-7), Br(tau -> mu SP) less than or similar to 10(-7), Br(B-s -> SP) less than or similar to 10(-4), Br(B -> K-(*()) SP) less than or similar to 10(-4), Br(D -> SP) less than or similar to 10(-7) with sgoldstino subsequent decays into kinematically allowed pairs of SM particles gamma gamma, e(+)e(-), mu(+)mu(-), etc. Remarkably, the prominent signature of sgoldstino pair production is two muon pairs with pair momenta peaked at sgoldstino masses.

• 出版日期2012-4-16