Size of fireballs created in high energy heavy ion collisions as inferred from Coulomb distortions of pion spectra

Ayala, Alejandro; Jeon, Sangyong; Kapusta, Joseph I.

doi:10.1103/physrevc.59.3324

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…[36] concluded that: the SIS data are consistent with V C = 27 MeV corresponding to a freeze-out radius of 8 fm, the AGS data are consistent with a radius of 10 fm, and the early SPS data (NA44) are consistent with a 9 fm radius. A full transport model calculation [38,39] was also applied to these data. In that analysis, the freezeout radius was also found to be 10 fm for the AGS and SPS data sets.…”

Section: Introductionmentioning

confidence: 99%

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

Cebra¹,

Klay²,

Brovko³

et al. 2014

Preprint

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The subtle differences between positive and negative pion spectra can used be used to study the nature of the nuclear interaction region in heavy-ion collisions. Several large acceptance heavy ion experiments at facilities ranging from SIS, the AGS, the SPS, to RHIC have measured mid-rapidity π + and π − spectra for central Au+Au or Pb+Pb collisions. From these spectra one can create pion ratios as a function of mt − m0, which are used to determine the Coulomb potential, VC , and the initial pion ratio, Ri, across a range of collision energies from 1 to 158 AGeV. The implications of the VC and Ri trends with collision energy will be discussed.

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Section: Introductionmentioning

confidence: 99%

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

Cebra¹,

Klay²,

Brovko³

et al. 2014

Preprint

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“…The cited paper[18] also contains a description of various works made in the past on electromagnetic effects in low and high energy nuclear collisions. For more details on this subject, see[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

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confidence: 99%

Spectator-induced electromagnetic effect on directed flow in heavy ion collisions

Rybicki

Szczurek

2013

Phys. Rev. C

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We estimate the electromagnetic effect of the spectator charge on azimuthal anisotropies observed in heavy ion collisions. For peripheral Pb+Pb reactions at the top energy of the CERN Super Proton Synchrotron, √ s N N = 17.3 GeV, we predict this effect to bring very large distortions to the observed directed flow, v 1 , of positive and negative pions emitted close to beam rapidity. The overall magnitude of this effect is comparable to values of v 1 reported by the WA98 experiment. We argue that also at lower rapidities, the spectator induced electromagnetic effect may result in the splitting of values of v 1 observed for positive and negative pions. Such a splitting is visible in the data reported by the STAR Collaboration from the RHIC Beam Energy Scan. Both effects are sensitive to the space-time scenario assumed for pion emission. Therefore, they bring new information on the collision dynamics. 25.75Dw,25.75.Ld

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“…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]. In particular at low bombarding energies, the π − /π + ratio is expected to provide information on the symmetry term of the nuclear equation of state [17], thus requiring the Coulomb effect to be under full control [18].…”

Section: Introductionmentioning

confidence: 99%

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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Size of fireballs created in high energy heavy ion collisions as inferred from Coulomb distortions of pion spectra

Cited by 11 publications

References 18 publications

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

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

Spectator-induced electromagnetic effect on directed flow in heavy ion collisions

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

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