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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F22%3A00560994" target="_blank" >RIV/61389005:_____/22:00560994 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1140/epja/s10050-022-00796-6" target="_blank" >https://doi.org/10.1140/epja/s10050-022-00796-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epja/s10050-022-00796-6" target="_blank" >10.1140/epja/s10050-022-00796-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Physical Journal A

ISSN

1434-6001

e-ISSN

1434-601X

Svazek periodika

58

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

166

Kód UT WoS článku

000849216000001

EID výsledku v databázi Scopus

2-s2.0-85137671609