Impact of inclusive jet cross sections with low transverse momenta on the determination of gluon parton distributions in pp collisions

TL;DR

This paper investigates how low transverse momentum inclusive jet cross section measurements at 8 TeV impact the determination of the gluon parton distribution function in the proton, especially at large Bjorken x, using next-to-leading order QCD analysis.

Contribution

It introduces the first detailed analysis of low-$p_T$ jet data's effect on gluon PDF constraints at high x in a global QCD fit.

Findings

Low-$p_T$ jet data significantly reduce gluon PDF uncertainties at x > 0.1.

Inclusion of these measurements enhances the precision of gluon distribution at large Bjorken x.

Results agree with theoretical predictions within uncertainties.

Abstract

Jet production at hadron colliders provides constraints on the parton distribution functions (PDFs) of the proton, in particular on the gluon distribution. In the present paper, the impact on PDF of CMS inclusive differential jet cross sections at center-of-mass energy of $\sqrt s = 8$ TeV for jets with low momentum $p\mathrm{_T}$ and produced in the forward direction is investigated at next-to leading order in perturbative quantum chromodynamics (QCD). The results of the QCD global analysis are compared with theoretical predictions. The impact of low-$p\mathrm{_T}$ jet measurements on the determination of the gluon distribution is assessed. The inclusion of the discussed measurements adds further constraints on the uncertainty of the gluon distribution at large Bjorken $x > 0.1$, where the low-$p_T$ data have the largest impact.