39,377 research outputs found
Non-extensive statistical effects in high-energy collisions
No full textFollowing the basic prescriptions of the relativistic Tsallis’ non-extensive thermostatistics, we investigate from a phenomenological point of view the relevance of non-extensive statistical effects on relativistic heavy-ion collisions observables, such as rapidity spectra of the net proton production, transverse momentum distributions and transverse momentum fluctuations. Moreover, we study the nuclear and the subnuclear equation of state, investigating the critical densities of a phase transition to a hadron-quark-gluon mixed phase by requiring the Gibbs conditions on the global conservation of the electric and the baryon charges. The relevance of small deviations from the standard extensive statistics is studied in the context of intermediate- and high-energy heavy-ion collisions
Non-extensive statistics, fluctuations and correlations in high-energy nuclear collisions
No full textStarting from the experimental evidence that high-energy nucleus-nucleus collisions cannot be described in terms of superpositions of elementary nucleon-nucleon interactions, we analyze the possibility that memory effects and long-range forces imply a non-extensive statistical regime during high-energy heavy-ion collisions. The relevance of these statistical effects and their compatibility with the available experimental data are discussed. In particular, we show that theoretical estimates obtained in the framework of the generalized non-extensive thermostatistics, can reproduce the shape of the pion transverse mass spectrum and explain the different physical origin of the transverse momentum correlation function of the pions emitted during the central Pb + Pb and during the p +p collisions at 158 GeV
Response functions of asymmetric nuclear-matter.
No full textWe consider the spin-isospin response of asymmetric nuclear matter. The associated free and RPA polarization propagators, relative to isospin-flipping operators, are analytically evaluated and the new features with respect to the symmetric matter are pointed out. We suggest the relevance of neutron excess for charge exchange reactions in the region of the quasi-elastic peak
Stability of strange quark matter: MIT bag versus Color Dielectric Model
No full textWe discuss the properties of strange matter, in particular the minimum of the energy per baryon number as a function of the strangeness fraction. We utilize both the MIT bag model and the color dielectric model and compare the energy per baryon with the masses of hyperons having the corresponding strangeness fraction, which are coherently calculated within both models. We also take into account the perturbative exchange of gluons. The results obtained in the two approaches allow to discuss the stability of strangelets. While the MIT bag model and the double minimum version of the color dielectric model allow the existence of strangelets, the single minimum version of the color dielectric model excludes this possibility
Non-extensive statistics effects in quark-gluon plasma and in relativistic heavy-ion collisions
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Non-extensive statistics, fluctuiations and correlations in high energy nuclear collisions
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