Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV
Name
Adamczyk-2012-Di-electron spectrum at mid-rapidity in.pdf
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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
Date Issued
August 2012
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.86.024906
