Nonuniversal gaugino masses and muong−2

Abstract

We consider two classes of supersymmetric models with nonuniversal gaugino masses at M GUT in an attempt to resolve the apparent muon g − 2 anomaly encountered in the Standard Model. We explore two distinct scenarios, one in which all gaugino masses have the same sign at M GUT , and a second case with opposite sign gaugino masses. The sfermion masses in both cases are assumed to be universal at M GUT . We exploit the non universality among gaugino masses to realize large mass splitting between the colored and non-colored sfermions. Thus, the sleptons can have masses in the few hundred GeV range, whereas the colored sparticles turn out to be an order of magnitude or so heavier. In both models the resolution of the muon g − 2 anomaly is compatible, among other things, with a 125 − 126 GeV Higgs boson mass and the WMAP dark matter bounds.

GUT-inspired supersymmetric model forh→γγand the muong−2

“…It was shown in ref. [13] that the sleptons can be as light as 100 GeV in this model. This observation motivated us to investigate the decay rate for h → γγ and study the parameter space which yields enhancement or suppression for this process.…”

“…Thus, it is hard to simultaneously explain the observed Higgs boson mass and resolve the muon g − 2 anomaly if we consider CMSSM, NUHM1 or NUHM2, since in all these cases, the slepton masses are larger than 1 TeV. Recently, there have been several attempts to reconcile this apparent tension between muon g − 2 and the Higgs boson mass within the MSSM framework by assuming non-universal SSB mass terms for the gauginos [13,14] or the sfermions [15,16] at the GUT scale. Indeed, a simultaneous explanation of m h and muon g − 2 is possible [17] in the presence of t − b − τ Yukawa coupling unification condition [18].…”

“…This is a follow up of the work presented in ref. [13], where it was shown that the muon g − 2 anomaly can be explained in this model, but the decay rate for h → γγ was not analyzed. It was shown in ref.…”

“…On the other hand, as shown in ref. [13], non-universal gaugino masses allow for sufficiently light sleptons while keeping the colored sparticles in the multi TeV region. Because of this observation, we investigate the extent to which non-universality is allowed in the gaugino sector to enhance or suppress the decay channel h → γγ.…”

“…We choose different sign for gauginos which was again motivated from the work presented in ref [13], where it was shown that an opposite sign non-universal gaugino mass case is more preferable from the muon g − 2 point of view than the same sign non-universal gaugino case.…”