Coulomb effect in Au+Au and Pb+Pb collisions as a function of collision energy

Cebra, D.; Klay, J. L.; Brovko, S. G.; Flores, C.

doi:10.48550/arxiv.1408.1369

Cited by 10 publications

(21 citation statements)

References 21 publications

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“…where the value of the a and b parameters, as well as the 𝜒 2 /𝑑𝑜𝑓 are given in The f2 and f3 functions seems to describe better the behavior of the Coulomb kick energy dependence, while the f1 functions fails to describe this dependence. The Coulomb kick decrease with the increase of the beam energy, showing that the Coulomb interaction is stronger at lower energies, as it has been already observed in other analyzes [18][19][20]. If the colliding nuclei are strongly stopped, the total charge stays for a sufficient time to affect the charged pions.…”

Section: Resultssupporting

confidence: 61%

Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies

Ristea

Jipa

2018

Advances in High Energy Physics

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The publication of this article was funded by SCOAP 3 .Coulomb effects on charged pion transverse momentum spectra measured in Au+Au collisions at RHIC-BES energies are investigated. From these spectra the − / + ratios as a function of transverse momentum are obtained and used to extract the "Coulomb kick", (a momentum change due to the Coulomb interaction), and initial pion ratio for three different collision energies and various centrality classes. The Coulomb kick shows a decrease with the increase of beam energy and a clear centrality dependence, with larger values for the most central collisions. The results are connected with the kinetic freeze-out dynamics.

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Section: Resultssupporting

confidence: 61%

Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies

Ristea

Jipa

2018

Advances in High Energy Physics

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“…within a hadronic transport model allowing for different freeze-out times and loci depending on the charge and momentum of the pions. Here, we follow instead a more data-driven ansatz similar to the one applied in [14,10], where all pions are assumed to freezeout at the same time, and parameterize the attenuation of the electrostatic force by replacing V C with an effective potential V eff expressed as a function of the pion kinetic energy measure for the relative velocities of pions and protons, and integrating over the proton velocity distribution, the authors of [14] found…”

Section: Coulomb Field Acting On Charged Pionsmentioning

confidence: 99%

“…Note that this second factor has been omitted in previous work, e.g. in [14,10], and it is novel in our methodology.…”

Section: Coulomb Field Acting On Charged Pionsmentioning

confidence: 99%

“…An increase of the π − /π + yield ratio at low momenta was first observed in early Bevalac experiments [1,2,3] and was quickly interpreted as being related to the Coulomb field [4,5]. Indeed, these effects turned out to be ubiquitous in heavy-ion collisions, ranging from SIS beam energies [6,7,8], to AGS [9,10], SPS [11], and even up to RHIC energies, as discussed in an extensive report [10]. The early theoretical work done to interpret the Bevalac data [4,5] was taken up again as the SIS, AGS, and SPS results became available [12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 95%

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Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions

Adamczewski-Musch,

Arnold,

Behnke

et al. 2022

Preprint

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In nuclear collisions the incident protons generate a Coulomb field which acts on produced charged particles. The impact of these interactions on charged-pion transversemass and rapidity spectra, as well as on pion-pion momentum correlations is investigated in Au+Au collisions at √ s NN = 2.4 GeV. We show that the low-m t part of the data (m t < 0.2 GeV/c 2 ) can be well described with a Coulomb-modified Boltzmann distribution that also takes changes of the Coulomb field during the expansion of the fireball into account. The observed centrality dependence of the fitted mean Coulomb potential deviates strongly from a A 2/3 part scaling, indicating that, next to the fireball, the non-interacting charged spectators have to be taken into account. For the most central collisions, the Coulomb modifications of the HBT source radii are found to be consistent with the potential extracted from the single-pion transverse-mass distributions. This finding suggests that the region of homogeneity obtained from two-pion correlations coincides with the region in which the pions freeze-out. Using the inferred mean-square radius of the charge distribution at freeze-out, we have deduced a baryon density, in fair agreement with values obtained from statistical hadronization model fits to the particle yields.

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“…[9]. This prediction has sparked interest in the community, especially in light of the BES-II and its Fixed Target Program [24,25], which is intended to provide larger statistics and reach lower collision energies.…”

Section: Introductionmentioning

confidence: 99%

Quartic cumulant of baryon number in the presence of QCD critical point

Mroczek,

Noronha-Hostler,

Acuna

et al. 2020

Preprint

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In the context of the ongoing search for the QCD critical point at the Relativistic Heavy-Ion Collider, we study the equation of state near the critical point in the temperature and baryon chemical potential plane. We use the parametric representation introduced in earlier literature, which maps the universal 3D Ising equation of state onto the QCD phase diagram using several non-universal parameters. We focus on the quartic cumulant of the baryon number, or baryon number susceptibility χ B 4 , which can be accessed experimentally via net-proton fluctuation kurtosis measurements. It was originally predicted, through universality arguments based on the leading singular contribution, that χ B 4 and net-proton kurtosis should show a specific non-monotonic behavior due to the critical point. In particular, when following the freeze-out curve on the phase diagram by decreasing beam energy, the kurtosis is expected to dip, and then peak, when the beam energy scan passes close to the critical point. We study the effects of the non-universal and thus far unknown parameters of the Ising-to-QCD mapping on the behavior of χ B 4 . We find that, while the peak remains a solid feature, the presence of the critical point does not necessarily cause a dip in χ B 4 on the freezeout line below the transition temperature. The critical point contribution to the dip appears only for a narrow set of mapping parameters, when subleading singular terms are sufficiently suppressed.

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Coulomb effect in Au+Au and Pb+Pb collisions as a function of collision energy

Cited by 10 publications

References 21 publications

Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies

Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies

Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions

Quartic cumulant of baryon number in the presence of QCD critical point

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