Transverse Expansion and High $p_T$ Azimuthal Asymmetry at RHIC

Details Transverse Expansion and High $p_T$ Azimuthal Asymmetry at RHIC Transverse Expansion and High $p_T$ Azimuthal Asymmetry at RHIC

2001-09-20

arxiv.org/abs/nucl-th/0109063v2

Phys.Lett.B526:301-308,2002

Physics

Nuclear Physics

Nuclear Theory

Journal version: 1 figure added, references added. 6 pages, 4 figures

Scientific paper

10.1016/S0370-2693(02)01157-7

Rapid 3+1D transverse plus Bjorken collective expansion in $A+A$ collisions at ultra-relativistic energies is shown to reduce substantially the azimuthal asymmetry resulting from jet quenching. While the azimuthal asymmetry in non-central collisions, $v_2(p_T>2 \rm{GeV/c})\sim 0.15$ reported by STAR at RHIC, can be accounted for by spatially anisotropic jet energy loss through a 1+1D expanding gluon plasma with $dN^g/dy\sim 1000$, we show that if rapid transverse collective expansion of the plasma is assumed, then the asymmetry due to jet quenching may be reduced below the observed level. Possible implications of this effect are discussed.

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