Connecting fluctuation measurements in heavy-ion collisions with the grand-canonical susceptibilities

Vovchenko, Volodymyr; Savchuk, О.; Poberezhnyuk, Roman V.; Gorenstein, M. I.; Koch, Volker

doi:10.1016/j.physletb.2020.135868

Cited by 68 publications

(68 citation statements)

References 21 publications

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“…Recently, a subensemble acceptance method (SAM) has been developed [1,22] that allows one to correct cumulants of conserved charges for the effect of exact global conservation laws. More specifically, the SAM expresses the cumulants measured in a coordinate space subsystem of a thermal system in terms of the grand-canonical susceptibilities and a fraction α of the whole volume covered by the subsystem.…”

Section: Introductionmentioning

confidence: 99%

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Vovchenko

2021

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We introduce the subensemble acceptance method 2.0 (SAM-2.0) -a procedure to correct cumulants of a random number distribution inside a subsystem for the effect of exact global conservation of a conserved quantity to which this number is correlated, with applications to measurements of event-by-event fluctuations in heavy-ion collisions. The method expresses the corrected cumulants in terms of the cumulants inside and outside the subsystem that are not subject to the exact conservation. The derivation assumes that all probability distributions associated with the cumulants are peaked at the mean values but are otherwise of arbitrary shape. The formalism reduces to the original SAM [1] when applied to a coordinate space subvolume of a uniform thermal system. As the new method is restricted neither to the uniform systems nor to the coordinate space, it is applicable to fluctuations measured in heavy-ion collisions at various collision energies in different momentum space acceptances. The SAM-2.0 thus brings the experimental measurements and theoretical calculations of event-by-event fluctuations closer together, as the latter are typically performed without the account of exact global conservation.

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Section: Introductionmentioning

confidence: 99%

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Vovchenko

2021

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“…The subensemble acceptance method (SAM) has been developed recently [33][34][35][36] to perform a correction on the cumulants for exact global conservation laws. Although this topic has been studied before in the framework of ideal gas of particles and antiparticles [37,38], the main feature of the SAM is that it is model-independent and has no assumptions about the underlying equation of state.…”

Section: Recent Developments 31 Subensemble Acceptance Methods (Sam)mentioning

confidence: 99%

“…The original SAM [33,34] was formulated for the case of single conserved charge. The method explores fluctuations of a globally conserved charge 𝐵 in a coordinate space subsystem which covers a fraction 𝛼 of the total volume.…”

Section: Single Conserved Chargementioning

confidence: 99%

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Phenomenological developments for event-by-event fluctuations of conserved charges

Vovchenko¹

2021

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“…The bulk observables in heavy-ion collision are commonly well described by relativistic hydrodynamics [10][11][12]. Event-by-event fluctuations, however, are affected by several additional mechanisms like baryon number conservation [13,14], the smearing of fluctuations due to momentum cuts [15], volume fluctuations [16,17], and other effects. The two main issues mentioned above have recently been addressed at the LHC energies in Refs.…”

Section: Introductionmentioning

confidence: 99%

Net-particle number fluctuations in a hydrodynamic description of heavy-ion collisions

2022

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Utilizing viscous hydrodynamic simulations of heavy-ion collisions, we study the behavior of cumulants of (net-)(anti)proton number distributions at RHIC beam energy scan energies, incorporating non-critical contributions like baryon conservation and excluded volume. The experimental data on net-proton cumulants at √SNN > 20 GeV are consistent with simultaneous effects of global baryon conservation and repulsive interactions in baryon sector, whereas the data at lower collision energies show possible indications for sizable attractive interactions among baryons. We discuss the behavior of factorial cumulants in addition to the ordinary cumulants, and also address the quantitative difference between proton and baryon number cumulants.

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Connecting fluctuation measurements in heavy-ion collisions with the grand-canonical susceptibilities

Cited by 68 publications

References 21 publications

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Phenomenological developments for event-by-event fluctuations of conserved charges

Net-particle number fluctuations in a hydrodynamic description of heavy-ion collisions

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