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Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions
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SYSNO ASEP 0560994 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions Author(s) Adamczewski-Musch, J. (DE)
Arnold, O. (DE)
Behnke, C. (DE)
Belounnas, A. (FR)
Chlad, Lukáš (UJF-V) RID, ORCID, SAI
Kugler, Andrej (UJF-V) RID, ORCID, SAI
Rodriguez Ramos, Pablo (UJF-V)
Sobolev, Yuri, G. (UJF-V) ORCID
Svoboda, Ondřej (UJF-V) RID, ORCID, SAI
Tlustý, Pavel (UJF-V) ORCID, SAI
Wagner, Vladimír (UJF-V) RID, ORCID, SAINumber of authors 127 Article number 166 Source Title European Physical Journal A. - : Springer - ISSN 1434-6001
Roč. 58, č. 9 (2022)Number of pages 15 s. Publication form Print - P Language eng - English Country US - United States Keywords Coloumb field ; heavy ion collisions ; HBT source OECD category Particles and field physics R&D Projects LTT17003 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF18_046/0016066 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure FAIR-CZ II - 90112 - Ústav jaderné fyziky AV ČR, v. v. i. Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000849216000001 EID SCOPUS 85137671609 DOI 10.1140/epja/s10050-022-00796-6 Annotation In nuclear collisions the incident protons generate a Coulomb field which acts on produced charged particles. The impact of these interactions on charged-pion transverse-mass and rapidity spectra, as well as on pion-pion momentum correlations is investigated in Au + Au collisions at root s(NN) = 2.4 GeV. We show that the low-m t region (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 energy deviates strongly from a A(part)(2/3) 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. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023 Electronic address https://doi.org/10.1140/epja/s10050-022-00796-6
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