$χ_c$ production in modified NRQCD

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 $J/ψ$ and $ψ'$ production at the LHC. In this paper, we study $χ_c$ production: we fit as before the unknown matrix-element using data from Tevatron. We, then, extend the results of the previous paper for $J/ψ$ production by calculating the effect of $χ_c$ feed-down to the $J/ψ$ cross-section, which, by comparing with CMS results at $\sqrt{s}=$ 13 TeV, we demonstrate to be small. We have also computed $χ_c^1$ and $χ_c^2$ at $\sqrt{s}=$7 TeV and find excellent agreement with data from the ATLAS experiment.