Production of a forward J/psi and a backward jet at the LHC

TL;DR

This paper investigates the production of a forward J/psi meson and a backward jet with large rapidity separation at the LHC, comparing NRQCD and color evaporation models within the BFKL formalism.

Contribution

It provides a comparative analysis of NRQCD and the color evaporation model for charmonium production in a specific LHC process using BFKL formalism, highlighting the dominance of a particular NRQCD component.

Findings

NRQCD's ^3 S_1^{8} component dominates the process.

NRQCD and color evaporation models yield similar results.

Discrepancies arise at lower transverse momenta of charmonium and jet.

Abstract

We study the production of a forward $J/\psi$ meson and a backward jet with a large rapidity separation at the LHC using the BFKL formalism. We compare the predictions given by the Non Relativistic QCD (NRQCD) approach to charmonium prediction and by the Color Evaporation Model. In NRQCD, we find that the $^3 S_1^{\, 8}$ part of the onium wavefunction is completely dominating the process. NRQCD and the color evaporation model give similar results, although a discrepancy seems to appear as the value of the transverse momenta of the charmonium and of the jet decrease.