Charged Higgs production via bg -> tH- at the LHC

TL;DR

This work analyzes charged Higgs production via bg → tH- at the LHC within the MSSM framework, focusing on radiative QCD corrections. It shows that near-threshold soft-gluon emissions dominate higher-order effects and provides analytical NNLO soft-gluon corrections at NLL accuracy, including scale-dependent terms and explicit coefficient structures. Numerical results at 14 TeV demonstrate that NNLO-NLL corrections substantially enhance the cross section over Born, while simultaneously greatly reducing scale dependence and aligning closely with exact NLO results. The findings highlight strong sensitivity to the charged Higgs mass and tanβ, with milder dependence on the top-quark mass, underscoring the robustness of the predicted cross sections for experimental searches.

Abstract

I present a calculation of QCD radiative corrections to charged Higgs production via the process bg -> tH-. I show that the cross section is dominated by soft-gluon corrections, which are computed through next-to-next-to-leading order. Results for charged Higgs production at the LHC are presented, including the dependence of the cross section on the charged Higgs mass, the top quark mass, the factorization and renormalization scales, and tan beta.

Figures (8)

• Figure 1: The total cross section for charged Higgs production at the LHC.
• Figure 2: The $K$-factors for charged Higgs production at the LHC.
• Figure 3: The ratio of cross sections at various scales for charged Higgs production at the LHC. The bold lines are with $\mu=m_{H^-}+m_t$; the rest are with $\mu=(m_{H^-}+m_t)/2$.
• Figure 4: The ratio of exact and approximate NLO cross sections for charged Higgs production at the LHC.
• Figure 5: The scale dependence for production of a charged Higgs with mass $m_{H^-}=500$ GeV at the LHC.