# Prompt and nonprompt J/$\psi$ production and nuclear modification in $p$Pb collisions at $\sqrt{s_{\text{NN}}}= 8.16$ TeV

## TL;DR

This paper measures prompt and nonprompt J/ψ production in pPb collisions at 8.16 TeV, analyzing nuclear effects and comparing results with various theoretical models to understand quarkonium production in nuclear environments.

## Contribution

It provides the first detailed double differential cross-sections and nuclear modification factors for J/ψ in pPb collisions at this energy, testing multiple theoretical approaches.

## Key findings

- Nuclear modification factors indicate suppression at certain kinematics.
- Results favor models incorporating nuclear parton distribution functions.
- Data show differences between prompt and nonprompt J/ψ production patterns.

## Abstract

The production of J/$\psi$ mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\text{NN}}}=8.16$ TeV with the LHCb detector at the LHC. The double differential cross-sections of prompt and nonprompt J/$\psi$ production are measured as functions of the J/$\psi$ transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame. Forward-to-backward ratios and nuclear modification factors are determined. The results are compared with theoretical calculations based on collinear factorisation using nuclear parton distribution functions, on the colour glass condensate or on coherent energy loss models.