Study of Particle Ratio Fluctuations and Charge Balance Functions at RHIC

Wang, Hui

doi:10.48550/arxiv.1304.2073

Cited by 4 publications

(7 citation statements)

References 39 publications

(75 reference statements)

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“…Preliminary results from the STAR Collaboration [21] from central (0-5% most central) Au+Au collisions at √ s nn = 200 GeV. These are shown alongside the calculations in Fig.…”

Section: Resultsmentioning

confidence: 88%

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Evolution of Charge Fluctuations and Correlations in the Hydrodynamic Stage of Heavy Ion Collisions

Pratt,

Kim,

Plumberg

2017

Preprint

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Charge fluctuations for a baryon-neutral quark-gluon plasma have been calculated in lattice gauge theory. These fluctuations provide a well-posed rigorous representation of the quark chemistry of the vacuum for temperatures above T c 155 MeV. Due to the finite lifetime and spatial extent of the fireball created in relativistic heavy ion collisions, chargecharge correlations can only equilibrate for small volumes due to the finite time required to transport charge. This constraint leads to charge correlations at finite relative position that evolve with time. The source and evolution of such correlations is determined by the evolution of the charge fluctuation and the diffusion constant for light quarks. Here, calculations are presented for the evolution of such correlations superimposed onto hydrodynamic simulations. Results are similar to preliminary measurements from STAR, but significant discrepancies remain.

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“…Preliminary results from the STAR Collaboration [21] from central (0-5% most central) Au+Au collisions at √ s nn = 200 GeV. These are shown alongside the calculations in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…The sums ignore the terms where the pair refers to a particle with itself. These correlations have been measured by STAR for pp, pK, KK and ππ [21]. They have also been measured by STAR, NA49 and by ALICE for the case where h and h refer to hadron indexed by charge only [22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Charge Fluctuations and Correlations in the Hydrodynamic Stage of Heavy Ion Collisions

Pratt,

Kim,

Plumberg

2017

Preprint

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“…The first goal of this paper is to gauge the degree to which charge-balance correlations affect higher-order correlations. Charge balance functions, which are two-particle correlations related to charge conservation, have been measured extensively [31][32][33][34][35][36][37][38][39][40][41], and modeled theoretically [42][43][44][45][46][47][48][49]. In addition to making it difficult for phases to separate or for critical correlations to emerge, local charge conservation also represents its own source of correlation, which needs to be understood as a potential source of background before making firm arguments to have observed phenomena related to phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Charge Conservation and Higher Moments of Charge Fluctuations

Pratt,

Steinhorst

2020

Preprint

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Higher moments of distributions of net charge and baryon number in heavy-ion collisions have been proposed as signals of fundamental QCD phase transitions. In order to better understand background processes for these observables, models are presented which enable one to gauge the effects of local charge conservation, decays of resonances and clusters, Bose symmetrization, and volume fluctuations. Monte Carlo methods for generating samplings of particles consistent with local charge conservation are presented, and are followed by a review of simple analytic models involving a single type of charge with a constant experimental efficiency. The main model consists of thermal emission superimposed onto a simple parameterization of collective flow, known as a blast-wave, with emission being consistent with individual canonical ensembles. The spatial extent of local charge conservation is parameterized by the size and extent over which charge is conserved. The sensitivity of third and fourth order moments, skewness and kurtosis, to these parameters, and to beam energy and baryon density is explored. Comparisons with STAR data show that a significant part of the observed non-Poissonian fluctuations in net-proton fluctuations are explained by charge and baryon-number conservation, but that measurements of the STAR collaboration for fluctuations of net electric charge significantly differ from expectations of the models presented here.

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“…By analyzing charge balance functions indexed by hadronic species from STAR [7], it appears that the susceptibilities for strangeness and baryon number grew markedly during early times. This is evidenced by the relatively broad balance functions for pp and K + K − when plotted as a function of relative rapidity.…”

Section: Introductionmentioning

confidence: 99%

“…The in-plane balance function, φ 1 ≈ 0, is significantly narrower than the the out-of-plane balance function, φ 1 ≈ 90 • , due to the stronger collective flow. When φ 1 ≈ 45 • the balance function skew towards negative ∆φ because the balancing charge is more likely to be found closer to the reaction plane, where more particles are emitted.The model calculations (blue lines) have been scaled by a factor of 0.94 to match the normalization of the preliminary experimental results from STAR[7] (red stars). After adjusting the normalization the experimental and model results are in remarkable agreement.…”

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confidence: 99%

Evolving charge correlations in a hybrid model with both hydrodynamics and hadronic Boltzmann descriptions

Pratt

Plumberg

2019

Phys. Rev. C

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Correlations related to local charge conservation provide insight into the creation and evolution of up, down and strange charges in the quark-gluon plasma. Here, the evolution of charge correlations is overlaid onto a hydrodynamic calculation for the regions where temperature exceed 155 MeV, then transferred and carried through a microscopic model of the hadronic stage. Thus, for the first time, charge correlations are evolved consistently with a full state-of-the-art description of a heavy-ion collision. The charge correlations are projected onto charge balance functions, which characterize such correlations in the final state, and are presented as a function of relative rapidity and relative azimuthal angle for Au/Au collisions. The role of the hadronic stage is investigated. Calculation of the contribution to charge-separation observables related to the chiral magnetic effect are also presented. Calculations are compared to data from the STAR Collaboration at RHIC (Relativistic Heavy Ion Collider) data when possible.arXiv:1812.05649v1 [nucl-th]

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Study of Particle Ratio Fluctuations and Charge Balance Functions at RHIC

Cited by 4 publications

References 39 publications

Evolution of Charge Fluctuations and Correlations in the Hydrodynamic Stage of Heavy Ion Collisions

Evolution of Charge Fluctuations and Correlations in the Hydrodynamic Stage of Heavy Ion Collisions

Charge Conservation and Higher Moments of Charge Fluctuations

Evolving charge correlations in a hybrid model with both hydrodynamics and hadronic Boltzmann descriptions

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