Enhanced Charged Higgs Production through W-Higgs Fusion in W-b Scattering

TL;DR

This paper investigates the production of charged Higgs bosons at the LHC via W-Higgs fusion in 2HDMs, highlighting potential enhancements due to mass differences and a light pseudoscalar, with implications for detection strategies.

Contribution

It demonstrates the potential for significantly increased charged Higgs production through W-Higgs fusion, especially with a light pseudoscalar, and explores distinguishing features in kinematic distributions.

Findings

Production cross section can reach 0.1 pb at large tanβ.

Transverse momentum distribution can differentiate fusion diagrams.

Enhancement is possible beyond 2HDMs with additional particles.

Abstract

We study the associated production of a charged Higgs boson with a bottom quark and a light quark at the LHC via p p \to H^\pm\,b\,j in the Two Higgs Doublet Models (2HDMs). Using the effective W approximation, we show that there is exact cancellation among various Feynman diagrams in high energy limit. This may imply that the production of charged Higgs can be significantly enhanced in the presence of large mass differences among the neutral Higgs bosons via W^\pm-Higgs fusion in the p p \to H^\pm\,b\,j process. Particularly, we emphasize the potential enhancement due to a light pseudoscalar boson $A$, which is still allowed by the current data by which we explicitly calculate the allowed regions in (M_A,\,\tan\beta) plane, and show that the production cross section can be as large as 0.1 pb for large $\tan\beta$. We also show that the transverse momentum distribution of the b quark can potentially distinguish the W^\pm-A fusion diagram from the top diagram. Finally, we point out further enhancement when we go beyond the 2HDMs.