Gluon Saturation Effects in Relativistic U+U Collisions

Abstract

We examine entropy production in relativistic U+U collisions on the basis of a Color Glass Condensate (CGC) type picture as implemented in the Kharzeev-Levin-Nardi model (KLN). In this framework, we find that the peak entropy density produced in tip-on-tip U+U collisions is about 30% greater than that seen in central Au+Au collisions. Although the resulting difference in the produced charged particle multiplicity between tip-on-tip and side-on-side collisions is smaller than that predicted by previous Glauber model estimates, it is still large enough to allow for experimental discrimination between average orientations of the uranium nuclei. We also point out that in the saturation/CGC approach the collision geometry plays a more important role than previously believed, and that the observed centrality dependence of the produced particle multiplicity per participant in Au+Au collisions can be qualitatively reproduced even without running coupling effects.

7 pages, including 8 figures

References in corpus (20)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Hadron production in nuclear collisions at RHIC and high density QCD
• Anisotropic transverse flow and the quark-hadron phase transition
• Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
• Manifestations of high density QCD in the first RHIC data
• Saturation Physics and Deuteron--Gold Collisions at RHIC
• Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics
• The onset of classical QCD dynamics in relativistic heavy ion collisions
• Centrality Dependence of the Charged Particle Multiplicity near Mid-Rapidity in Au+Au Collisions at sqrt(s_NN) = 130 and 200 GeV
• QCD Saturation and Deuteron-Nucleus Collisions
• Gluon production in the Color Glass Condensate model of collisions of ultrarelativistic finite nuclei
• Hydrodynamic afterburner for the Color Glass Condensate and the parton energy loss
• Anisotropic flow and jet quenching in ultra-relativistic U+U collisions
• Multiplicity distribution and source deformation in full-overlap U+U collisions
• Uranium on uranium collisions at relativistic energies
• High energy collisions of strongly deformed nuclei: An old idea with a new twist
• Advantage of U+U over Au+Au collisions at constant beam energy

Cited by in corpus (18)

• The eccentricity in heavy-ion collisions from Color Glass Condensate initial conditions
• Eccentricity fluctuations and elliptic flow at RHIC
• Azimuthal anisotropy in U+U and Au+Au collisions at RHIC
• Eccentricity fluctuation effects on elliptic flow in relativistic heavy ion collisions
• Mass ordering of differential elliptic flow and its violation for phi mesons
• Parameterization of Deformed Nuclei for Glauber Modeling in Relativistic Heavy Ion Collisions
• Universality of the saturation scale and the initial eccentricity in heavy ion collisions
• Small x physics and RHIC data
• Two-Gluon Correlations in Heavy-Light Ion Collisions: Energy and Geometry Dependence, IR Divergences, and $k_T$-Factorization
• Running Coupling Corrections to High Energy Inclusive Gluon Production
• Elliptic flow fluctuations in central collisions of spherical and deformed nuclei
• Causal Viscous Hydrodynamics for Relativistic Heavy Ion Collisions
• Viscosity from elliptic flow: the path to precision
• Selection of special orientations in relativistic collisions of deformed heavy nuclei
• Azimuthal anisotropy measurements of strange and multistrange hadrons in U+U collisions at $\sqrt{s_{NN}}=193$ GeV at the BNL Relativistic Heavy Ion Collider
• Mutual boosting of the saturation scales in colliding nuclei
• Pion, kaon, and (anti-)proton production in U+U Collisions at $\sqrt{s_{NN}}$ = 193 GeV measured with the STAR detector
• Energy Dependent Growth of Nucleon and Inclusive Charged Hadron Distributions