Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2012) Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV. Physical Review C, 86 (2). pp. 24906-14. ISSN 0556-2813

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Abstract

We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e+e− decays, from √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 ω→e+e− invariant yields are consistent with previous measurements. The mid-rapidity yields (dN/dy) of φ and J/ψ are extracted through their di-electron decay channels and are consistent with the previous measurements of φ→K+K− and J/ψ→e+e−. Our results suggest a new upper limit of the branching ratio of the η→e+e− of 1.7×10−5 at the 90% confidence level.

Item Type: Article
Keywords: Di-electron, mid-rapidity, STAR
Date: August 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 11:00
Last Modified: 23 Feb 2016 15:56
URI: http://digre.pmf.unizg.hr/id/eprint/2249

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