Influence of Photon Inverse Emission on Forward-Backward Asymmetry in Dilepton Production at the LHC

Abstract

The contribution of photon inverse emission to dilepton production in hadron collisions at the Large Hadron Collider (LHC) is calculated in detail. Numerical analysis of inverse emission effects on cross sections and forward-backward asymmetry is performed in a wide kinematic region covering the CMS experiment at the Run 3/HL-LHC regime, corresponding to ultra-high energies and high dilepton invariant masses. We apply an effective technique using additive relative corrections to analyse the impact of radiative contributions on forward-backward asymmetry.

Figures (10)

• Figure 1: Dimuon production mechanisms in hadron collisions: a -- Drell--Yan, b -- $\gamma\gamma$ fusion, c -- quark-initiated photon/gluon inverse emission, d -- lepton-initiated photon inverse emission. Unsigned lines: $\gamma$ or $Z$-boson.
• Figure 2: Feynman diagrams for photon inverse emission: upper diagrams show photon-quark interactions, which can easily be converted into gluon-quark diagrams.
• Figure 3: The configuration of the three-momenta of the final particles in the partonic centre-of-mass system.
• Figure 4: Regions of integration in variables $y$ and $\cos\theta_3$ for the forward ($\sigma_{\rm F}$) and backward ($\sigma_{\rm B}$) cross sections.
• Figure 5: Relative corrections $\delta_+$ induced by photon IE for different contributions: quarks, leptons (muons), and interference terms.