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The rapidity and centrality dependence of nuclear modification factors at RHIC - what does bulk particle production tell us about the nuclear medium ?

Abstract : The BRAHMS experiment at RHIC has measured the production of charged hadrons as a function of pseudorapidity and transverse momentum in Au+Au, d + Au, and p+p collisions at a common energy of sqrt(s_NN)= 200 GeV, and from these spectra we construct the nuclear modification factors for both "hot" and "cold" nuclear matter. In this contribution I will show how these factors evolve with pseudorapidity and collision centrality. We see a Cronin-like enhancement in d+Au collisions at midrapidity, going to a strong suppression at eta >=2. In central Au+Au collisions we find a suppression both at mid-and forward rapidities that vanishes for peripheral collisions. We interpret this as signs of several different medium ralted effects modifying bulk particle production in Au+Au and d+Au collisions at RHIC energies.
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http://hal.in2p3.fr/in2p3-00023178
Contributor : Yvette Heyd <>
Submitted on : Wednesday, October 6, 2004 - 11:20:03 AM
Last modification on : Thursday, April 23, 2020 - 2:26:21 PM

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I. Arsene, G. Bearden, D. Beavis, C. Besliu, B. Budick, et al.. The rapidity and centrality dependence of nuclear modification factors at RHIC - what does bulk particle production tell us about the nuclear medium ?. 42th International Winter Meeting on Nuclear Physics, Jan 2004, Bormio, Italy. ⟨in2p3-00023178⟩

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