Next-to-leading order QCD predictions for $A^{0}\gamma$ associated production at the CERN Large Hadron Collider

TL;DR

This paper provides detailed NLO QCD predictions for the associated production of a neutral Higgs boson and a photon in the MSSM at the LHC, including SUSY effects, and assesses their experimental observability.

Contribution

It presents the first complete NLO QCD calculations for $pp ightarrow A^{0}\gamma + X$ in the MSSM, including SUSY corrections, and evaluates their impact on cross sections and signatures.

Findings

NLO QCD corrections increase cross sections by 15-20% for certain parameters.

Scale dependence is reduced to less than 5% with NLO corrections.

Monte Carlo simulations show detectable $ au^{+} au^{-}+\gamma$ signals above SM background.

Abstract

We calculate the complete next-to-leading-order (NLO) QCD corrections (including SUSY QCD corrections) to the inclusive total cross sections of the associated production processes $pp\rightarrow A^{0}\gamma+X$ in the minimal supersymmetric standard model (MSSM) at the CERN Large Hadron Collider (LHC). Our results show that the enhancement of the total cross sections from the NLO QCD corrections can reach $15%\sim20%$ for 200 GeV$<m_{A}<500$ GeV and $\tan\beta=50$. The scale dependence of the total cross section is improved by the NLO corrections, which is less than 5%. We also show the Monte Carlo simulation results for the $\tau^{+}\tau^{-}+\gamma$ signature including the complete NLO QCD effects, and find an observable signature above the standard model (SM) background for a normal luminosity of 100 fb$^{-1}$ at the LHC.