EPL, 85 (2009) 22002
DOI: 10.1209/0295-5075/85/22002

Fresh look at the Hagedorn mass spectrum as seen in the experiments

K. A. Bugaev, V. K. Petrov and G. M. Zinovjev

Bogolyubov Institute for Theoretical Physics, National Academy of Science of Ukraine - Kiev, Ukraine

bugaev@th.physik.uni-frankfurt.de

received 29 July 2008; accepted in final form 9 December 2008; published January 2009
published online 20 January 2009

Abstract
The medium-dependent finite width is introduced into an exactly solvable model with the general mass-volume spectrum of the QGP bags. The model allows us to estimate the minimal value of the QGP bags' width from the lattice QCD data. The large width of the QGP bags not only explains the observed deficit in the number of hadronic resonances comparing to the Hagedorn mass spectrum, but also clarifies the reason why the heavy QGP bags cannot be directly observed as metastable states in a hadronic phase.

PACS
25.75.-q - Relativistic heavy-ion collisions.
25.75.Dw - Particle and resonance production.
25.75.Nq - Quark deconfinement, quark-gluon plasma production, and phase transitions.

© EPLA 2009