Production and decays of a light ${\varphi }^0$ in the LRTH model under the LHC Higgs data

Abstract

In this paper we study the production and decays of a light pseudoscalar boson ${\varphi }^0$ with $m_{{\varphi }^0}\le m_h/2$ appeared in the left-right twin Higgs (LRTH) model, and explore its phenomenological consequences when the latest LHC Higgs data are taken into account. We found that (a) the decay rate $Br(h\to {\varphi }^0{\varphi }^0)$ can be as large as $80\%$ and can suppress significantly the visible $\gamma \gamma$ signal rate, but the latest LHC Higgs data put a strong constraint on it: $Br(h\to {\varphi }^0{\varphi }^0)\le 30\%$ at $3\sigma$ level; (b) the $p$-value of the LRTH model is around $0.6$, smaller than that of the SM in most of the parameter space and approaches the SM value $0.8$ for a sufficiently large $f$ parameter; (c) the neutral pseudoscalar ${\varphi }^0$ dominantly decay into $b\bar{b}$ and the decay rate $Br({\varphi }^0\to b\bar{b})$ can be larger than $80\%$ for $m_{{\varphi }^0}\le 60$ GeV, and the second main decay mode is ${\varphi }^0\to {\tau }^{+}{\tau }^{-}$ with a branching ratio about $14\%$; and (d) at the future $e^{-}{e}^{+}$ collider with $\sqrt{s}=250$ GeV, the processes $e^{+}{e}^{-}\to Zh\to Z({\varphi }^0{\varphi }^0)\to Z(4b,2b2\tau )$ are promising for discovering such a light pseudoscalar ${\varphi }^0$.

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• Lightness of a Higgs Boson and Spontaneous CP-violation in the Lee Model: An Alternative Scenario
• Single Higgs boson production at the ILC in the left-right twin Higgs model
• Muon g-2 Anomaly confronted with the higgs global data in the Left-Right Twin Higgs Models
• Constraining dark matter in the LRTH model with latest LHC, XENON100 and LUX data