Orateur
Dr
Airton Deppman
(São Paulo University)
Description
The statistical approach first proposed by Hagedorn was suceesful in the interpretation of many aspects of high energy hadron collisions. One important result of Hagedorn's theory~\cite{Hagedorn} is the existence of a critical temperature, $T_c$, above which the composed system, the so-called fireball, is impossible to go.
However, when still higher energies were available at new accelarators, as RICH and LHC, it was soon realized that Hagedorn's theory could no longer explain the experimental results. Indeed, this theory was replaced by a generalization~\cite{Beck, Bediaga} which includes the well-known Tsallis statistics, instead of the Boltzmann statistics used by Hagedorn. The generalized theory, here called Hagedorn-Tsallis theory, can explain the experimental data even at energies as high as those obtained at LHC.
In this work we study how the Hagedorn-Tsallis theory fits to transverse momentum distributions obtained in $p$-$p$ and $A$-$A$ collisions with $\sqrt{s}$ ranging from 200 GeV up to 7 TeV, and verify if the critical temperature limit is still valid.
The results show that Hagedorn-Tsallis theory agree with experiments even when a critical temperature is supposed to exist. We also obtain the dependence of the correlation parameter, $q$, typical in Tsallis statitics, on the value assumed for the critical temperature.
Auteur principal
Dr
Airton Deppman
(São Paulo University)
Co-auteur
Isaac Sena
(São Paulo University)
