Angular variation of hard back-to-back hadron suppression in heavy-ion collisions

Journal Article · Mon Sep 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.034904· OSTI ID:21192220

Renk, Thorsten ^[1]

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1. Department of Physics, University of Jyvaeskylae, P.O. Box 35, FI-40014 Finland and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 (Finland)

The basic idea of jet tomography is to infer information about the density evolution of the medium created in heavy-ion (A-A) collisions by studying the suppression of hard probes in an A-A environment as compared to the baseline process known from proton-proton (p-p) collisions. The suppression of back-to-back correlations in heavy-ion collisions allows, due to a different geometrical bias, a view into the medium that is qualitatively different from the one offered by single-hadron suppression. A control parameter for the suppression corresponding to a systematic variation of in-medium path lengths and densities can be obtained by studying collisions at finite impact parameter b. A systematic variation of path length can then be introduced by studying the suppression pattern as a function of the angle {phi} with the reaction plane. Using a three-dimensional hydrodynamic evolution model for the medium and a Monte Carlo model that has been shown to successfully reproduce the measured suppression of back-to-back correlations in central collisions of Au-Au at 200A GeV, we compute the suppression as a function of {phi} for b of 2.4, 4.5, 6.3, and 7.5 fm. Given that this involves variations in both control parameters b and {phi}, a comparison with data should eventually allow one to place strong constraints on the combination of the energy loss model and the medium evolution model.

• OSTI ID: 21192220
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevC.78.034904; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
COLLISIONS
COMPARATIVE EVALUATIONS
CORRELATIONS
DENSITY
ENERGY LOSSES
EVOLUTION
GEV RANGE
GOLD
HEAVY ION REACTIONS
HEAVY IONS
IMPACT PARAMETER
MONTE CARLO METHOD
PROTON-PROTON INTERACTIONS
PROTONS
THREE-DIMENSIONAL CALCULATIONS
TOMOGRAPHY