LHC Lunch
Speaker: Yun Jiang
Title: Multiple/Degenerate Higgs scenarios within the NMSSM perspective
Host: Markus Luty
Room: 430
Abstract:
We have assessed the extent to which various semi-constrained NMSSM (scNMSSM) scenarios with, at least, a $\sim$125 GeV Higgs are able to describe the Higgs-like signal at the LHC and Tevatron. In light of the fact that broadened mass peaks are natural, we proposed a novel idea --- ``degenerate Higgs'' --- which predicts that not merely one but more than one Higgs has mass near 125 GeV. For the purpose of verifying our idea, we examined scNMSSM scenarios in which both the lightest Higgs h1 and the second lightest Higgs h2 have mass near 125 GeV. As what we expected, very substantially enhanced $\gamma\gamma$ and other signals are possible. Furthermore, we developed diagnostic tools that could discriminate whether or not there are two (or more) Higgs bosons versus just one contributing to the LHC signals at 125 GeV.
In addition, two interesting multiple Higgs scenarios will be presented. (i) For the 125 GeV+136 GeV LHC-Tevatron scenario, we showed that the best fit to the Tevatron results in the $b\bar{b}$ channel and the mild excesses in CMS data in the $\gamma\gamma$ channel at 136 GeV and in the $\tau\tau$ channel above 132~GeV can be explained by the heavier Higgs h2 in this mass range, together with the lightest h1 at 125 GeV discovered at the LHC. (ii) For the 98+125 LEP-LHC scenario, we saw that the lightest Higgs h1 is consistent with the small LEP excess at 98 GeV whereas the heavier Higgs h2 possesses the primary features of the LHC Higgs-like signals at 125 GeV, including an enhanced $\gamma\gamma$ rate. Both scenarios can be consistent with practically all available signal rates, including a reduced rate in the $b\bar{b}$ ($\tau\tau$) channel around 98 GeV (125 GeV) in the former (latter) scenario.
