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Hadronization in heavy-ion collisions: recombination or fragmentation?

R J Fries1, B Müller1, C Nonaka1 and S A Bass1,2

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We show that hadron production in relativistic heavy-ion collisions at transverse momenta larger than 2 GeV/c can be explained by the competition of two different hadronization mechanisms. Above 5 GeV/c hadron production can be described by fragmentation of partons that are created perturbatively. Below 5 GeV/c recombination of partons from the dense and hot fireball dominates. This can explain some of the surprising features of RHIC data such as the constant baryon-to-meson ratio of about one and the small nuclear suppression for baryons between 2 to 4 GeV/c.


PACS

25.75.Dw Particle and resonance production

21.65.-f Nuclear matter

24.10.Pa Thermal and statistical models

27.80.+w 190(less-than-or-equal-to)A(less-than-or-equal-to)219

24.85.+p Quarks, gluons, and QCD in nuclear reactions

Subjects

Nuclear physics

Dates

Issue 1 (January 2004)

Received 27 May 2003

Published 11 December 2003



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