Europhys. Lett.
Volume 76, Number 3, November 2006
Page(s) 402 - 408
Section Nuclear physics
Published online 27 September 2006
Europhys. Lett., 76 (3), pp. 402-408 (2006)
DOI: 10.1209/epl/i2006-10280-8

The Hagedorn thermostat

L. G. Moretto1, K. A. Bugaev1, 2, J. B. Elliott1 and L. Phair1

1  Nuclear Science Division, Lawrence Berkeley National Laboratory Berkeley, CA, USA
2  Bogolyubov Institute for Theoretical Physics - Kiev, Ukraine

received 18 May 2006; accepted in final form 8 September 2006
published online 27 September 2006

At variance with previous understanding, a system $\mathcal{H}$ with a Hagedorn-like mass spectrum can sustain the unique temperature $T_{\mathcal{H}}$ encoded in the spectrum itself. $\mathcal{H}$ imposes the same temperature to all emitted particles which are then in physical and chemical equilibrium with $\mathcal{H}$ and with each other. Coexistence between hadronic and partonic phases is thus completely characterized. This may explain the recurring constant physical and chemical temperature observed in several experiments. The near indifference of $\mathcal{H}$ to fragmentation or coalescence makes this approach relevant to heavy-ion and elementary-particle collisions alike. The equation of state for a gas of $\mathcal{H}$ systems has been derived.

25.75.Nq - Quark deconfinement, quark-gluon plasma production, and phase transitions.

© EDP Sciences 2006