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Fast equilibration of hadrons in an expanding fireball

J. Noronha-Hostler
(
- Frankfurt U., FIAS
)
,
C. Greiner
(
- Frankfurt U.
)
,
I.A. Shovkovy
(
- Western Illinois U.
)

Nov, 2007

4 pages

Published in:

Phys.Rev.Lett. 100 (2008) 252301

e-Print:

0711.0930 [nucl-th]

DOI:

10.1103/PhysRevLett.100.252301

View in:

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Abstract: (arXiv)

Due to long chemical equilibration times within standard hadronic reactions during the hadron gas phase in relativistic heavy ion collisions it has been suggested that the hadrons are 'born' into equilibrium after the quark gluon plasma phase. Here we develop a dynamical scheme in which possible Hagedorn states contribute to fast chemical equilibration times of baryon anti-baryon pairs (as well as kaon anti-kaon pairs) inside a hadron gas and just below the critical temperature. Within this scheme, we use master equations and derive various analytical estimates for the chemical equilibration times. Applying a Bjorken picture to the expanding fireball, the kaons and baryons as well as the bath of pions and Hagedorn resonances can indeed quickly chemically equilibrate for both an initial overpopulation or underpopulation of Hagedorn resonances. Moreover, a comparison of our results to

(B+\bar{B})/\pi^{+}

and

K/\pi^{+}

ratios at RHIC, indeed, shows a close match.

24.85.+p
25.75.Dw
12.38.Mh
heavy ion: scattering
hadron: hadroproduction
yield: ratio
hadron: gas
baryon: pair production
K: pair production
fireball

References(34)

Figures(0)

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