Nuclear p$_{⊥}$-broadening of Drell-Yan and quarkonium production from SPS to LHC
Résumé
The nuclear p$_{⊥}$-broadening of Drell-Yan and quarkonium (J/ψ, Υ) production in πA 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 α = 0.25–0.30. The magnitude of the transport coefficient at x = 10$^{−2}$ is $ {\hat{q}}_0=0.051\;{\mathrm{GeV}}^2/\mathrm{fm} $ and $ {\hat{q}}_0=0.075\;{\mathrm{GeV}}^2/\mathrm{fm} $qˆ0 = 0.075 GeV$^{2}$/fm, whether $ Q\overline{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.
Mots clés
nuclear broadening
transport coefficient
cold nuclear matter
Phenomenological Models
QCD Phenomenology
quarkonium: production
color: singlet
color: octet
gluon: density
p nucleus: scattering
pi nucleus: scattering
Drell-Yan process
transport theory
CERN LHC Coll
CERN SPS
nuclear matter
transverse momentum: broadening
scaling
J/psi(3100): production
Upsilon(9460): production