Searching for Charged Higgs Boson in Polarized Top Quark

Abstract

The charged Higgs boson is quite common in many new physics models. In this study we examine the potential of observing a heavy charged Higgs boson in its decay mode of top-quark and bottom-quark in the Type-II Two-Higgs-Doublet-Model. In this model, the chirality structure of the coupling of charged Higgs boson to the top- and bottom-quark is very sensitive to the value of $\tan \beta$. As the polarization of the top-quark can be measured experimentally from the top-quark decay products, one could make use of the top-quark polarization to determine the value of $\tan \beta$. We preform a detailed analysis of measuring top-quark polarization in the production channels $gb\to t{H}^{-}$ and $g\bar{b}\to \bar{t}{H}^{+}$. We calculate the helicity amplitudes of the charged Higgs boson production and decay.Our calculation shows that the top-quark from the charged Higgs boson decay provides a good probe for measuring $\tan \beta$, especially for the intermediate $\tan \beta$ region. On the contrary, the top-quark produced in association with the charged Higgs boson cannot be used to measure $\tan \beta$ because its polarization is highly contaminated by the $t$-channel kinematics.

21 pages, 12 figures, 2 tables

References in corpus (3)

• Color Sextet Vector Bosons and Same-Sign Top Quark Pairs at the LHC
• New angles on top quark decay to a charged Higgs
• Top quark spin and $Htb$ interaction in charged Higgs and top quark associated production at LHC

Cited by in corpus (4)

• Exclusive production of heavy charged Higgs boson pairs in the $pp\to pp{H}^{+}{H}^{-}$ reaction at the LHC and a future circular collider
• Exploring a heavy charged Higgs using jet substructure in a fully hadronic channel
• The Hunt for the Rest of the Higgs Bosons
• Determination of charged Higgs couplings at the LHC