Individual Tsallis fits to ALICE Pb-Pb 2.76 TeV pion, kaon, and proton spectra give effective temperatures and freezeout volumes that rise toward central collisions while the nonextensivity parameter q falls, a pattern the authors read as evidence for multiple kinetic freezeout.
Consequences of temperature fluctuations in observables measured in high energy collisions
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abstract
We review the consequences of intrinsic, nonstatistical temperature fluctuations as seen in observables measured in high energy collisions. We do this from the point of view of nonextensive statistics and Tsallis distributions. Particular attention is paid to multiplicity fluctuations as a first consequence of temperature fluctuations, to the equivalence of temperature and volume fluctuations, to the generalized thermodynamic fluctuations relations allowing us to compare fluctuations observed in different parts of phase space, and to the problem of the relation between Tsallis entropy and Tsallis distributions. We also discuss the possible influence of conservation laws on these distributions and provide some examples of how one can get them without considering temperature fluctuations.
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Thermodynamic Analysis of Transverse Momentum Spectra in Pb-Pb Collisions at 2.76 TeV: Centrality Dependence of Temperature, Freezeout Parameters and Non-Extensitivity
Individual Tsallis fits to ALICE Pb-Pb 2.76 TeV pion, kaon, and proton spectra give effective temperatures and freezeout volumes that rise toward central collisions while the nonextensivity parameter q falls, a pattern the authors read as evidence for multiple kinetic freezeout.