Abstract
Temperature fluctuations may have two distinct origins, first, quantum fluctuations that are initial state fluctuations, and second, thermodynamical fluctuations. We discuss a method of extracting the thermodynamic temperature from the mean transverse momentum of pions, by using controllable parameters such as centrality of the system, and range of the transverse momenta. Event-by-event fluctuations in global temperature over a large phase space provide the specific heat of the system. We present Beam Energy Scan of specific heat from data, AMPT and HRG model prediction. Experimental results from NA49, STAR, PHENIX, PHOBOS and ALICE are combined to obtain the specific heat as a function of beam energy. These results are compared to calculations from AMPT event generator, HRG model and lattice calculations, respectively.
Highlights
Experiments at RHIC and LHC are on the quest to unearth the nature of the QCD phase transition and to get a glimpse of how matter behaves at such extreme conditions
For obtaining the event-by-event fluctuation, the temperature needs to Entries(a.u.)
(a) NA49 (b) STAR Au-Au be estimated in every event either by fitting in a specified region or by calculating mean transverse momentum of particles
Summary
Experiments at RHIC and LHC are on the quest to unearth the nature of the QCD phase transition and to get a glimpse of how matter behaves at such extreme conditions. For obtaining the event-by-event fluctuation, the temperature needs to Entries(a.u.) (a) NA49 (b) STAR Au-Au be estimated in every event either by fitting in a specified (thermal) region or by calculating mean transverse momentum ( pT ) of particles.
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