Could two NMSSM Higgs bosons be present near 125 GeV?

Abstract

We examine GUT-scale NMSSM scenarios in which {\it both} $h_1$ and $h_2$ lie in the 123 -- 128 GeV mass range. Very substantially enhanced $γγ$ and other rates are possible. Broadened mass peaks are natural.

Figures (8)

• Figure 1: Correlation of $gg\rightarrow (h_1,h_2)\rightarrow \gamma\gamma$ signal strengths when both $h_1$ and $h_2$ lie in the $123\hbox{--}128~{\rm GeV}$ mass range. The circular points have $\Omega h^2<0.094$, while diamond points have $0.094\leq \Omega h^2\leq 0.136$. Points are color coded according to $m_{h_2}-m_{h_1}$ as indicated on the figure.
• Figure 2: $R^h_{gg}(X)$ for $X=\gamma\gamma,VV,b\overline b$, and $R^h_{\rm VBF}(b\overline b)$ versus $m_h$. For application to the Tevatron, note that $R_{\rm VBF}^h(b\overline b)=R^h_{W^*\rightarrow Wh}(b\overline b)$. The color code here and in the following figures is green for points with $2~{\rm GeV}<m_{h_2}-m_{h_1}\leq 3~{\rm GeV}$, blue for $1~{\rm GeV} <m_{h_2}-m_{h_1}\leq 2~{\rm GeV}$, and red for $m_{h_2}-m_{h_1}\leq 1~{\rm GeV}$.
• Figure 3: Left: correlation between the gluon fusion induced $\gamma\gamma$ and $VV$ rates relative to the SM. Right: correlation between the gluon fusion induced $\gamma\gamma$ rate and the $WW$ fusion induced $b\overline b$ rates relative to the SM; the relative rate for $W^*\rightarrow Wh$ with $h\rightarrow b\overline b$ (relevant for the Tevatron) is equal to the latter.
• Figure 4: Left: effective Higgs masses obtained from different channels: $m_h^{gg}(\gamma\gamma)$ versus $m_h^{gg}(VV)$. Right: $\gamma\gamma$ signal strength $R_{gg}^{h}(\gamma\gamma)$ versus effective coupling to $b\bar{b}$ quarks $({C^h_{b\bar{b}}})^2$. Here, ${C^h_{b\bar{b}}}^2\equiv\left[R_{gg}^{h_1}(\gamma\gamma){C^{h_1}_{b\bar{b}}}^2 +R_{gg}^{h_2} (\gamma\gamma){C^{h_2}_{b\bar{b}}}^2\right]/ \left[R_{gg}^{h_1}(\gamma\gamma)+R_{gg}^{h_2} (\gamma\gamma)\right]$.
• Figure 5: Dependence of $R^h_{gg}(\gamma\gamma)$ on $\lambda$, $\kappa$, $\tan\beta$ and $\mu_{\text{eff}}$.