The rapidity dependence of the average transverse momentum in p+Pb collisions at the LHC: the Color Glass Condensate versus hydrodynamics

Abstract

We show that in proton-lead (p+Pb) collisions at the LHC, the Color Glass Condensate (CGC) and hydrodynamics lead to qualitatively different behavior of the average transverse momentum, <p_T>, with the particles rapidity. In hydrodynamics, the <p_T> decreases as one goes from zero rapidity, y=0, to the proton fragmentation region since the number of particles decreases. In contrast, in the CGC the saturation momentum increases as one goes from y=0 to the proton fragmentation region, and so the <p_T> increases. At the LHC, the difference between the two models may be large enough to be tested experimentally.

4 pages, 2 figures

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• A scaling relation between pA and AA collisions
• Statistics of initial density perturbations in heavy ion collisions and their fluid dynamic response
• Di-photon "Ridge" in p+p and p+A collisions at RHIC and the LHC
• Pseudorapidity dependence of long-range two-particle correlations in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• p-Pb collisions at 5.02 TeV in the Parton-Hadron-String-Dynamics transport approach
• Multi-particle eccentricities in collisions dominated by fluctuations
• On the rapidity dependence of the average transverse momentum in hadronic collisions
• Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect
• Multiplicity and rapidity dependence of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Rapidity dependence of transverse-momentum multiplicity correlations
• The rapidity dependence of the average transverse momentum in p+p and p+Pb collisions - revisited