D^\pm Production Asymmetry at the LHC from Heavy-Quark Recombination

TL;DR

This paper calculates the D± production asymmetry at the LHC using heavy-quark recombination, successfully matching experimental measurements and distributions in eta and p_T.

Contribution

It introduces a heavy-quark recombination model with fitted parameters to explain D± asymmetry at the LHC, aligning theory with experimental data.

Findings

Asymmetry A_p ~ -1% in the specified kinematic range

Calculated eta and p_T distributions agree with LHCb data

Model reproduces measured asymmetry within uncertainties

Abstract

The asymmetry in the forward region production cross section of D^\pm is calculated using the heavy-quark recombination mechanism for pp collisions at 7 TeV. By suitable choices of four non-perturbative parameters, our calculated results can reproduce those obtained at LHCb. We find A_p ~ -1% when integrated over 2.0 GeV < p_T < 18 GeV and 2.2< eta <4.75, which agrees with A_p=-0.96\pm0.26\pm0.18% as measured by LHCb. Furthermore, the calculated distributions in eta and p_T agree reasonably well with those obtained at LHCb.