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Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV
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SYSNO ASEP 0385117 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV Author(s) Adamczyk, M. (PL)
Agakishiev, G. (RU)
Aggarwal, M. M. (IN)
Ahammed, Z. (IN)
Alakhverdyants, A. V. (RU)
Alekseev, I. (RU)
Alford, J. (US)
Anderson, B. D. (US)
Barnovská, Zuzana (UJF-V)
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Chaloupka, Petr (UJF-V) RID
Chung, Paul (UJF-V)
Hajková, O. (CZ)
Kapitán, Jan (UJF-V)
Pachr, M. (CZ)
Rusňák, Jan (UJF-V) RID, ORCID, SAI
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Tlustý, David (UJF-V)Number of authors 369 Source Title Physical Review. C - ISSN 0556-2813
Roč. 86, č. 2 (2012), s. 024906Number of pages 14 s. Language eng - English Country US - United States Keywords di-electron production ; relativistic collision Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders R&D Projects LA09013 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UJF-V - RVO:61389005 UT WOS 000307274900004 DOI 10.1103/PhysRevC.86.024906 Annotation We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e(+) e(-) decays, from root s = 200 GeV p + p collisions, measured by the large-acceptance experiment STAR at the Relativistic Heavy Ion Collider. The ratio of the di-electron continuum to the combinatorial background is larger than 10% over the entire mass range. Simulations of di-electrons from light-meson decays and heavy-flavor decays (charmonium and open charm correlation) are found to describe the data. The extracted omega -> e(+) e(-) invariant yields are consistent with previous measurements. The mid-rapidity yields (dN/dy) of phi and J/psi are extracted through their di-electron decay channels and are consistent with the previous measurements of phi -> K+ K- and J/psi -> e(+) e(-). Our results suggest a new upper limit of the branching ratio of the eta -> e(+) e(-) of 1.7 x 10(-5) at the 90% confidence level. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2013
Number of the records: 1