979 research outputs found
Thermalization through Hagedorn states - the importance of multiparticle collisions
Quick chemical equilibration times of hadrons within a hadron gas are
explained dynamically using Hagedorn states, which drive particles into
equilibrium close to the critical temperature. Within this scheme master
equations are employed for the chemical equilibration of various hadronic
particles like (strange) baryon and antibaryons. A comparison of the Hagedorn
model to recent lattice results is made and it is found that for both Tc =176
MeV and Tc=196 MeV, the hadrons can reach chemical equilibrium almost
immediately, well before the chemical freeze-out temperatures found in thermal
fits for a hadron gas without Hagedorn states.Comment: 8 pages, 3 figures, talk presented at the International Conference on
Strangeness in Quark Matter, Buzios, Rio de Janeiro, Brazil, Sept. 27 - Oct.
2, 200
Chemical Equilibration and Transport Properties of Hadronic Matter near
We discuss how the inclusion of Hagedorn states near leads to short
chemical equilibration times of proton anti-proton pairs, pairs, and
pairs, which indicates that hadrons do not need to be
"born" into chemical equilibrium in ultrarelativistic heavy ion collisions. We
show that the hadron ratios computed within our model match the experimental
results at RHIC very well. Furthermore, estimates for near
computed within our resonance gas model are comparable to the string theory
viscosity bound . Our model provides a good description of the
recent lattice results for the trace anomaly close to MeV.Comment: 4 pages, 3 figures, to appear in the conference proceedings for Quark
Matter 2009, March 30 - April 4, Knoxville, Tennesse
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