Energy dependence of acceptance-corrected dielectron excess mass spectrum at mid-rapidity in Au plus Au collisions at root(NN)-N-S=19.6 and 200 GeV

Adamczyk, L.; Bielčík, J.; Bielčíková, Jana; Chaloupka, P.; Federič, Pavol; Rusňák, Jan; Rusňáková, O.; Šumbera, Michal; Tlustý, David; Trzeciak, B. A.; Vértési, Robert

doi:https://dx.doi.org/10.1016/j.physletb.2015.08.044

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Energy dependence of acceptance-corrected dielectron excess mass spectrum at mid-rapidity in Au plus Au collisions at root(NN)-N-S=19.6 and 200 GeV

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SYSNO ASEP	0454034
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Energy dependence of acceptance-corrected dielectron excess mass spectrum at mid-rapidity in Au plus Au collisions at root(NN)-N-S=19.6 and 200 GeV
Author(s)	Adamczyk, L. (PL) Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Chaloupka, P. (CZ) Federič, Pavol (UJF-V)_{ORCID, SAI} Rusňák, Jan (UJF-V)_{RID, ORCID, SAI} Rusňáková, O. (CZ) Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Tlustý, David (UJF-V) Trzeciak, B. A. (CZ) Vértési, Robert (UJF-V)
Number of authors	336
Source Title	Physics Letters. B. - : Elsevier - ISSN 0370-2693 Roč. 750, NOV (2015), s. 64-71
Number of pages	8 s.
Publication form	Print - P
Language	eng - English
Country	NL - Netherlands
Keywords	STAR collaboration ; nucleus-nucleus collisions ; CERN-SPS
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
R&D Projects	GA13-20841S GA ČR - Czech Science Foundation (CSF)
Institutional support	UJF-V - RVO:61389005
UT WOS	000364250600013
EID SCOPUS	84940398947
DOI	10.1016/j.physletb.2015.08.044
Annotation	The acceptance-corrected dielectron excess mass spectra, where the known hadronic sources have been subtracted from the inclusive dielectron mass spectra, are reported for the first time at mid-rapidity vertical bar Y-ee vertical bar <1 in minimum-bias Au + Au collisions at root(NN)-N-S and 200 GeV. The excess mass spectra are consistently described by a model calculation with a broadened p spectral function for Mee <1.1 GeV/c2. The integrated dielectron excess yield at root(NN)-N-S= 19.6 GeV for 0.4 < M-ee <0.75 GeV/c(2), normalized to the charged particle multiplicity at mid-rapidity, has a value similar to that in In + In collisions at root(NN)-N-S = 17.3 GeV. For root(NN)-N-S = 200 GeV, the normalized excess yield in central collisions is higher than that at root(NN)-N-S = 17.3 GeV and increases from peripheral to central collisions. These measurements indicate that the lifetime of the hot, dense medium created in central Au + Au collisions at root(NN)-N-S = 200 GeV is longer than those in peripheral collisions and at lower energies.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2016

Number of the records: 1