New charged Higgs boson discovery channel at the LHC

Abstract

The ATLAS and CMS experiments have an ambitious search program for charged Higgs bosons. The two main searches for $H^{\pm }$ at the LHC have traditionally been performed in the $\tau \nu$ and $tb$ decay channels, as they provide the opportunity to probe complementary regions of the Minimal SuperSymmetric Model (MSSM) parameter space. Charged Higgs bosons may decay also to light quarks, $H^{\pm }\to cs/cb$, which represent an additional probe for the mass range below $m_t$. In this work, we focus on $H^{\pm }\to \mu \nu$ as an alternative channel in the context of two Higgs doublet model type III. We explored the prospect of looking $pp\to tb{H}^{\pm }$, followed by $H^{\pm }\to \mu \nu$ signal at the LHC. Such a scenario appears in 2HDM type-III where couplings of the charged Higgs are enhanced to $\mu \nu$. Almost all the experimental searches rely on the production and decay of the charged Higgs are taken into account. We show that for a such scenario, the above signal is dominant for most of the parameter space, and $H^{\pm }\to \mu \nu$ can be an excellent complementary search. Benchmarks points are proposed for further Monte Carlo analysis.

Comments: 21 pages, 9 Figures