$\chi_c$ production in modified NRQCD

TL;DR

This paper extends a modified NRQCD model to include $$ production, fitting parameters from Tevatron data and validating predictions against LHC measurements, showing small feed-down effects and good agreement with ATLAS data.

Contribution

The paper introduces an extension of the modified NRQCD model to $$ production, fitting non-perturbative parameters and validating predictions with LHC data.

Findings

Small $$ feed-down effect on $J/$ production.

Excellent agreement with ATLAS $$ data at 7 TeV.

Model successfully predicts $$ production cross-sections.

Abstract

In a previous paper, we had modified Non-Relativistic QCD as it applies to quarkonium production by taking into account the effect of perturbative soft-gluon emission from the colour-octet quarkonium states. We tested the model by fitting the unknown non-perturbative parameter in the model from Tevatron data and using that to make parameter-free predictions for $J/\psi$ and $\psi '$ production at the LHC. In this paper, we study $\chi_c$ production: we fit as before the unknown matrix-element using data from Tevatron. We, then, extend the results of the previous paper for $J/\psi$ production by calculating the effect of $\chi_c$ feed-down to the $J/\psi$ cross-section, which, by comparing with CMS results at $\sqrt{s}=$ 13 TeV, we demonstrate to be small. We have also computed $\chi_c^1$ and $\chi_c^2$ at $\sqrt{s}=$7 TeV and find excellent agreement with data from the ATLAS experiment.