Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV
Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Leight, William Axel; Surrow, Bernd; Redwine, Robert P; Seele, Joseph Patrick; Steadman, Stephen G; van Nieuwenhuizen, Gerrit J; ... Show more Show less
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We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e[superscript +]e[superscript −] 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[superscript +]e[superscript −] invariant yields are consistent with previous measurements. The mid-rapidity yields (d N/dy) of φ and J/ψ are extracted through their di-electron decay channels and are consistent with the previous measurements of φ→K[superscript +]K[superscript −] and J/ψ→e[superscript +]e[superscript −]. Our results suggest a new upper limit of the branching ratio of the η→e[superscript +]e[superscript −] of 1.7×10[superscript −5] at the 90% confidence level.
Date issued
2012-08Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L. et al. “Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV.” Physical Review C 86.2 (2012). ©2012 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X