Measurement of the photon$+b$-jet production differential cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96~\TeV$

TL;DR

This paper measures the differential cross section of photon plus b-jet production in proton-antiproton collisions at 1.96 TeV, comparing results with various QCD theoretical models and event generators.

Contribution

It provides the first detailed measurement of photon+b-jet differential cross sections at Tevatron energies and compares them with multiple theoretical predictions.

Findings

Measured cross sections agree with some NLO QCD calculations.

Results show differences with certain Monte Carlo predictions.

Data constrains parton distribution functions and QCD models.

Abstract

We present measurements of the differential cross section dsigma/dpT_gamma for the inclusive production of a photon in association with a b-quark jet for photons with rapidities |y_gamma|< 1.0 and 30<pT_gamma <300 GeV, as well as for photons with 1.5<|y_gamma|< 2.5 and 30< pT_gamma <200 GeV, where pT_gamma is the photon transverse momentum. The b-quark jets are required to have pT>15 GeV and rapidity |y_jet| < 1.5. The results are based on data corresponding to an integrated luminosity of 8.7 fb^-1, recorded with the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider at sqrt(s)=1.96 TeV. The measured cross sections are compared with next-to-leading order perturbative QCD calculations using different sets of parton distribution functions as well as to predictions based on the kT-factorization QCD approach, and those from the Sherpa and Pythia Monte Carlo event generators.