Nuclear $p_{\perp }$-broadening of Drell-Yan and quarkonium production from SPS to LHC

Abstract

The nuclear $p_{\perp }$-broadening of Drell-Yan and quarkonium ($J/\psi$, ${\rm Y}$) production in $\pi$A and pA collisions is investigated. The world data follow a simple scaling from SPS to LHC energies, once the process-dependent color factors are properly taken into account, which allows for the extraction of the transport coefficient in cold nuclear matter. We find that $\hat{q}(x)\propto x^{-\alpha }$ with $\alpha =0.25$-$0.30$. The magnitude of the transport coefficient at $x=10^{-2}$ is ${\hat{q}}_0=0.051$ GeV${}^2$/fm and ${\hat{q}}_0=0.075$ GeV${}^2$/fm, whether $Q\bar{Q}$ pairs are assumed to be produced as color octet or color singlet states, respectively. The relation between nuclear broadening data and the (CT14) gluon density is also investigated.

arXiv comment22 pages, 5 figures

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