Implications of a high mass light MSSM Higgs scalar for SUSY searches at the LHC

Abstract

The Atlas and CMS collaborations have both reported an excess of events in the WW\star \rightarrow \ell+\ell- + ETmiss search channel, which could be the first evidence for the Higgs boson. In the context of the MSSM, the lightest SUSY Higgs scalar h is expected to occur with mass mh = 135 GeV, depending on the range of SUSY parameters scanned over. Since the h \rightarrow WW\star branching fraction falls swiftly with decreasing mh, a signal in the WW\star channel would favor an h at the high end of its predicted mass range. We scan over general GUT scale SUSY model parameters to find those which give rise to mh > 130 GeV. A value of m0 \sim 10 - 20 TeV is favored, with A0 \sim \pm2m0, while the lower range of m1/2 < 1 TeV is also slightly favored. This gives rise to an "effective SUSY" type of sparticle mass spectrum. For low m1/2, gluino pair production followed by three-body gluino decay to top quarks may ultimately be accesible to LHC searches, while for higher m1/2 values, the SUSY spectra would likely be out of range of any conceivable LHC reach. Since the thermal neutralino relic abundance tends to be very high, late-time entropy dilution or neutralino decay to light axinos would be required to gain accord with the measured dark matter abundance

12 pages, 3 figures, some references added, accepted in PRD

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