Statistical ensembles with finite bath: A description for an event generator

Hauer, M.; Wheaton, S.

doi:10.1103/physrevc.80.054915

Cited by 4 publications

(2 citation statements)

References 68 publications

(127 reference statements)

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“…However, since most of the experiments cover only limited phase space, the part of the fireball accessible to the measurements may resemble with the Grand Canonical Ensemble (GCE) where energy (momentum), charge and number are not conserved locally. In general, the magnitude of multiplicity fluctuations and correlations in limited phase space crucially depends on the choice of the statistical ensemble that imposes different conservation laws [15,16]. Since no extensive quantities like energy, momentum and charge are needed to be locally conserved in GCE, the particles following Maxwell-Boltzmann distribution are assumed to be uncorrelated and fluctuations are expected to follow Poisson statistics even in the limited phase space when quantum effects are ignored.…”

Section: Hadron Resonance Gas Modelmentioning

confidence: 99%

Conserved number fluctuations in a hadron resonance gas model

et al. 2013

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Net-baryon, net-charge and net-strangeness number fluctuations in high energy heavy-ion collisions are discussed within the framework of a hadron resonance gas (HRG) model. Ratios of the conserved number susceptibilities calculated in HRG are being compared to the corresponding experimental measurements to extract information about the freeze-out condition and the phase structure of systems with strong interactions. We emphasize the importance of considering the actual experimental acceptances in terms of kinematics (pseudorapidity (η) and transverse momentum (p T )), the detected charge state, effect of collective motion of particles in the system and the resonance decay contributions before comparisons are made to the theoretical calculations. In this work, based on HRG model, we report that the net-baryon number fluctuations are least affected by experimental acceptances compared to the net-charge and net-strangeness number fluctuations.

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Section: Hadron Resonance Gas Modelmentioning

confidence: 99%

Conserved number fluctuations in a hadron resonance gas model

et al. 2013

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“…In heavy-ion collision, if one could make the measurements with full phase-space coverage, no conserved number fluctuation would be seen, as baryon number (B), electric charge (Q) and strangeness (S) are strictly conserved. In thermal models, the magnitude of multiplicity fluctuations and correlations in limited phase-space crucially depends on the choice of the statistical ensemble that imposes different conservation laws [23]. The micro canonical ensemble (MCE) considers all the micro states where energy, momentum and charge are conserved.…”

Section: Introductionmentioning

confidence: 99%

Multiplicity fluctuations in heavy-ion collisions using canonical and grand-canonical ensemble

2016

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We report the higher order cumulants and their ratios for baryon, charge and strangeness multiplicity in canonical and grand-canonical ensembles in ideal thermal model including all the resonances. When the number of conserved quanta is small, an explicit treatment of these conserved charges is required, which leads to a canonical description of the system and the fluctuations are significantly different from the grand canonical ensemble. Cumulant ratios of total charge and net-charge multiplicity as a function of collision energies are also compared in grand canonical ensemble. . 25.75.Gz, 12.38.Mh, 21.65.Qr, 25.75.Nq. PACS

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THERMINATOR 2: THERMal heavy IoN generATOR 2

Chojnacki

Kisiel

Florkowski

et al. 2012

Computer Physics Communications

181

185

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We present an extended version of THERMINATOR, a Monte Carlo event generator dedicated to studies of the statistical production of particles in relativistic heavyion collisions. The increased functionality of the code contains the following features: The input of any shape of the freeze-out hypersurface and the expansion velocity field, including the 3+1 dimensional profiles, in particular those generated externally with various hydrodynamic codes. The hypersufraces may have variable thermal parameters, which allows for studies departing significantly from the mid-rapidity region, where the baryon chemical potential becomes large. We include a library of standard sets of hypersurfaces and velocity profiles describing the RHIC Au+Au data at √ s N N = 200 GeV for various centralities, as well as those anticipated for the LHC Pb+Pb collisions at √ s N N = 5.5 TeV. A separate code, FEMTO-THERMINATOR, is provided to carry out the analysis of femtoscopic correlations which are an important source of information concerning the size and expansion of the system. We also include several useful scripts that carry out auxiliary tasks, such as obtaining an estimate of the number of elastic collisions after the freeze-out, counting of particles flowing back into the fireball and violating causality (typically very few), or visualizing various results: the particle p T -spectra, the elliptic flow coefficients, and the HBT correlation radii. We also investigate the problem of the back-flow of particles into the hydrodynamic region, as well as estimate the elastic rescattering in terms of trajectory crossings. The package is written in C++ and uses the CERN ROOT environment.

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Statistical ensembles with finite bath: A description for an event generator

Cited by 4 publications

References 68 publications

Conserved number fluctuations in a hadron resonance gas model

Conserved number fluctuations in a hadron resonance gas model

Multiplicity fluctuations in heavy-ion collisions using canonical and grand-canonical ensemble

THERMINATOR 2: THERMal heavy IoN generATOR 2

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