μtoeinR-symmetric supersymmetry

Abstract

We compute the one-loop corrections to the Z → b ¯ b vertex in the U (1) R symmetric minimal supersymmetric extension of the standard model. We find that the predicted value of R b is consistent with experiment if the mass of the lighter top squark is no more than 180 GeV. Furthermore, other data combines to place a lower bound of 88 GeV on the mass of the light top squark. A top squark in this mass range should be accessible to searches by experiments at FNAL and LEP. 1

Higgs boson mass and electroweak observables in the MRSSM

“…[15][16][17][18][19]. Excitingly, the MRSSM alleviates some of the most important experimental constraints on the MSSM: the R-symmetry forbids large contributions to flavor-violating observables, so the MRSSM is generically in agreement with flavor data even for an anarchic flavor structure in the sfermion sector and for sfermion masses below the TeV scale [14,20]. Similarly, heavy Dirac gluinos suppress the production cross section for squarks, making squarks below the TeV scale generically compatible with LHC data [21].…”

Mixing stops at the LHC

“…This is a consequence of the fact that most flavor violating observables turn out to be proportional to terms which break R-symmetry, and are hence suppressed [11][12][13]. Therefore, a significant amount of flavor mixing is possible and quite generic.…”

Fitting neutrino physics with a U(1) R lepton number

“…In addition, the LHC phenomenology is non standard, both due to the Dirac nature of the gluino [9][10][11][12] and to the presence of additional particles that can be rather easily detected [13]. Moreover, the Flavor Problem is also softened, since unsuppressed flavor changing terms are now allowed for sufficiently heavy gaugino Dirac masses [4,14].…”