The Left-Right asymmetry of top quarks in associated top-charged Higgs bosons at the LHC as a probe of the tan$\beta$ parameter

TL;DR

This paper investigates the left-right asymmetry in top quark production with charged Higgs bosons at the LHC, proposing it as a precise method to measure the MSSM parameter tanβ, sensitive to radiative corrections and superparticle spectrum.

Contribution

It introduces the use of top quark polarization asymmetry as a novel, theoretically clean probe for determining tanβ in the MSSM at the LHC.

Findings

Asymmetry remains sensitive to radiative corrections.

Potential to constrain superparticle spectrum.

Provides a new method for tanβ measurement.

Abstract

Many extensions of the Standard Model involve two Higgs doublet fields to break the electroweak symmetry, leading to the existence of three neutral and two charged Higgs particles. In particular, this is the case of the Minimal Supersymmetric extension of the Standard Model, the MSSM. A very important parameter is $\tan\beta$ defined as the ratio of the vacuum expectation value of the two Higgs doublets. In this paper we focus on the left-right asymmetry in the production of polarised top quarks in association with charged Higgs bosons at the LHC. This quantity allows for a theoretically clean determination of $\tan\beta$. In the MSSM, the asymmetry remains sensitive to the strong and electroweak radiative corrections and, thus, to the superparticle spectrum. Some possible implications of these results are discussed.