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Jet conversions in a quark-gluon plasma

W. Liu, C. M. Ko, and B. W. Zhang
Phys. Rev. C 75, 051901(R) – Published 4 May 2007

Abstract

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q¯)ggq(q¯) and the inelastic qq¯gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/π+ and p¯/π ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

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  • Received 27 July 2006

DOI:https://doi.org/10.1103/PhysRevC.75.051901

©2007 American Physical Society

Authors & Affiliations

W. Liu, C. M. Ko, and B. W. Zhang*

  • Cyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USA

  • *On leave from Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China.

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Vol. 75, Iss. 5 — May 2007

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