Lepton flavor-violating decays of the Higgs boson from sgoldstino mixing

Abstract

We study lepton flavor violation in a class of supersymmetric models with light sgoldstino - scalar superpartner of Goldstone fermions responsible for spontaneous supersymmetry breaking. Sgoldstino couplings to the Standard Model (SM) fermions are determined by the MSSM soft terms and, in general, provide with flavor violation in this sector. Sgoldstino admixture to the lightest Higgs boson results in changes of its coupling constants and, in particular, leads to lepton flavor-violating decay $h\to\tau\mu$ of the Higgs resonance. We discuss viability and phenomenological consequences of this scenario.Comment: 29 pages, 14 figure

Sgoldstino searches at CERN Electron Beam Dump

“…In general sgoldstino also mixes with neutral Higgs bosons as discussed in Refs. [10,[15][16][17]: the scalar sgoldstino S mixes with neutral light h and heavy H Higgs bosons, while pseudoscalar P mixes with their axial partner A. We account for the mixing with h only, since the other two do not change light scalar sgoldstino phenomenology at NA64 for considered set of parameters of the model.…”

Prospects of models with light sgoldstino in electron beam dump experiment at CERN SPS

“…In general sgoldstino also mixes with neutral Higgs bosons as discussed in Refs. [10,[15][16][17]: the scalar sgoldstino S mixes with neutral light h and heavy H Higgs bosons, while pseudoscalar P mixes with their axial partner A. We account for the mixing with h only, since the other two do not change light scalar sgoldstino phenomenology at NA64 for considered set of parameters of the model.…”

Gravitational waves from first-order electroweak phase transition in a model with light sgoldstinos

“…[11,12] and this scenario exhibits quite reach phenomenology, see, e.g. [13][14][15][16][17][18][19][20][21]. In particular, presence of relatively light sgoldstinos can noticeably affect the Higgs sector of the model, see e.g.…”