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arXiv · 2004.07188

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

François Arleo·Charles-Joseph Naïm
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Abstract

The nuclear $p_\perp$-broadening of Drell-Yan and quarkonium ($J/\psi$, $\Upsilon$) 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.

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François Arleo, Charles-Joseph Naïm. 2020-04-15. Nuclear $p_\perp$-broadening of Drell-Yan and quarkonium production from SPS to LHC. https://doi.org/10.1007/jhep07(2020)220

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