Next-to-leading order corrections to the spin-dependent energy spectrum of hadrons from polarized top quark decay in the general two Higgs doublet model

TL;DR

This paper calculates the next-to-leading order corrections to the spin-dependent energy spectrum of B mesons produced in polarized top quark decays involving a charged Higgs in the two-Higgs-doublet model, proposing a new search channel at the LHC.

Contribution

It provides a detailed NLO analysis of the polarized top decay into a charged Higgs and B mesons, extending the understanding of Higgs signatures in top decays within the 2HDM.

Findings

Energy distribution predictions for B mesons in polarized top decays.

Identification of a new potential channel for charged Higgs searches at the LHC.

Numerical analysis within the MSSM parameter space consistent with current experimental bounds.

Abstract

In recent years, searches for the light and heavy charged Higgs bosons have been done by the ATLAS and the CMS collaborations at the Large Hadron Collider (LHC) in proton-proton collision. Nevertheless, a definitive search is a program that still has to be carried out at the LHC. The experimental observation of charged Higgs bosons would indicate physics beyond the Standard Model. In the present work, we study the scaled-energy distribution of bottom-flavored mesons ($B$) inclusively produced in polarized top quark decays into a light charged Higgs boson and a massless bottom quark at next-to-leading order in the two-Higgs-doublet model; $t(\uparrow)\to bH^+\to BH^++X$. This spin-dependent energy distribution is studied in a specific helicity coordinate system where the polarization vector of the top quark is measured with respect to the direction of the Higgs momentum. The study of these energy distributions could be considered as a new channel to search for the charged Higgs bosons at the LHC. For our numerical analysis and phenomenological predictions, we restrict ourselves to the unexcluded regions of the MSSM $m_{H^+}-\tan\beta$ parameter space determined by the recent results of the CMS \cite{CMS:2014cdp} and ATLAS \cite{TheATLAScollaboration:2013wia} collaborations.