Evolution of charge fluctuations and correlations in the hydrodynamic stage of heavy ion collisions

Pratt, Scott; Kim, Jane; Plumberg, Christopher

doi:10.1103/physrevc.98.014904

Cited by 14 publications

(38 citation statements)

References 47 publications

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“…At lower energies, the NA49 Collaboration has also measured BFs at CERN SPS energies [27,28]. Detailed theoretical models describing the dynamics of charge correlations, superimposed onto state-of-theart dynamical descriptions of the bulk evolution, have been able to quantitatively reproduce several features of measurements at both RHIC and the LHC [4,[29][30][31]. The inferred diffusivity and chemistry from comparing models to data appears consistent with expectations from lattice gauge theory [32][33][34].…”

Section: Introductionmentioning

confidence: 85%

The Interplay of Femtoscopic and Charge-Balance Correlations

Pratt,

Martirosova

2022

Preprint

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Correlations driven by the constraints of local charge conservation have been shown to provide insight into the chemical evolution and diffusivity of the high-temperature matter created in ultra-relativistic heavy ion collisions. Two-particle correlations driven by final-state interactions have allowed the extraction of critical femtoscopic space-time information about the expansion and dissolution of the same collisions. Whereas correlations from final-state interactions mainly appear at small relative momenta, a few tens of MeV/c, charge-balance correlations extend over a range of hundreds of MeV/c. In nearly all previous analyses, this separation of scales is used to focus solely on one class or the other. The purpose of this study is to quantitatively understand the degree to which correlations from final-state interactions distort the interpretation of charge-balance correlations and vice versa.

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Section: Introductionmentioning

confidence: 85%

The Interplay of Femtoscopic and Charge-Balance Correlations

Pratt,

Martirosova

2022

Preprint

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“…In order to make the paper more self contained this section reviews the formalism and methods discussed in detail in [20].…”

Section: Theory: Charge Correlations In Coordinate Spacementioning

confidence: 99%

“…The source function is determined from the above constraint of the integral of C ab in Eq. ( 8) [20,21],…”

Section: A General Formalismmentioning

confidence: 99%

“…At the hyper-surface separating these two descriptions, the charge-charge correlation function must be translated into correlations indexed by hadron species based on statistical arguments. The accurate modeling of conserved charge dynamics thus raises a number technical challenges for constructing and propagating charge correlations throughout the collision lifetime which have been addressed previously in the context of heavy-ion collisions at RHIC [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…One thus expects increased leverage and constraining power, both for investigating the chemical evolution of the matter created in the collision and for extracting the diffusivity of the QGP. The same model applied to RHIC collisions in [20][21][22] will be applied here. Preliminary results from the ALICE Collaboration have appeared in the last year and will be compared to model results here [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Charge Balance Functions for Heavy-Ion Collisions at LHC Energies

Pratt,

Plumberg

2021

Preprint

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Heavy-ion collisions at the LHC provide the conditions to investigate regions of quark-gluon plasma that reach higher temperatures and that persist for longer periods of time compared to collisions at the Relativistic Heavy Ion Collider. This extended duration allows correlations from charge conservation to better separate during the quark-gluon plasma phase, and thus be better distinguished from correlations that develop during the hadron phase or during hadronization. In this study charge balance functions binned by relative rapidity and azimuthal angle and indexed by species are considered. A detailed theoretical model that evolves charge correlations throughout the entirety of an event is compared to preliminary results from the ALICE Collaboration. The comparison with experiment provides insight into the evolution of the chemistry and diffusivity during the collision. A ratio of balance functions is proposed to better isolate the effects of diffusion and thus better constrain the diffusivity.

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Transits of the QCD critical point

et al. 2019

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We analyze the evolution of hydrodynamic fluctuations in a heavy ion collision as the system passes close to the QCD critical point. We introduce two small dimensionless parameters λ and ∆ s to characterize the evolution. λ compares the microscopic relaxation time (away from the critical point) to the expansion rate λ ≡ τ 0 /τ Q , and ∆ s compares the baryon to entropy ratio, n/s, to its critical value, ∆ s ≡ (n/s − n c /s c )/(n c /s c ). We determine how the evolution of critical hydrodynamic fluctuations depends parametrically on λ and ∆ s . Finally, we use this parametric reasoning to estimate the critical fluctuations and correlation length for a heavy ion collision, and to give guidance to the experimental search for the QCD critical point.

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Evolution of charge fluctuations and correlations in the hydrodynamic stage of heavy ion collisions

Cited by 14 publications

References 47 publications

The Interplay of Femtoscopic and Charge-Balance Correlations

The Interplay of Femtoscopic and Charge-Balance Correlations

Charge Balance Functions for Heavy-Ion Collisions at LHC Energies

Transits of the QCD critical point

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