Parton Coalescence and the Antiproton/Pion Anomaly at RHIC

V. Greco, C. M. Ko, and P. Lévai

Phys. Rev. Lett. 90, 202302 – Published 22 May 2003

Abstract

Coalescence of minijet partons with partons from the quark-gluon plasma formed in relativistic heavy ion collisions is suggested as the mechanism for production of hadrons with intermediate transverse momentum. The resulting enhanced antiproton and pion yields at intermediate transverse momenta give a plausible explanation for the observed large antiproton to pion ratio. With further increasing momentum, the ratio is predicted to decrease and approach the small value given by independent fragmentations of minijet partons after their energy loss in the quark-gluon plasma.

Received 28 January 2003

DOI:https://doi.org/10.1103/PhysRevLett.90.202302

Authors & Affiliations

V. Greco¹, C. M. Ko¹, and P. Lévai^1,2

¹Cyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USA
²KFKI Research Institute for Particle and Nuclear Physics, P.O. Box 49, Budapest 1525, Hungary

Hadronization in Heavy-Ion Collisions: Recombination and Fragmentation of Partons

R. J. Fries, B. Müller, C. Nonaka, and S. A. Bass

Phys. Rev. Lett. 90, 202303 (2003)

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Vol. 90, Iss. 20 — 23 May 2003

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