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

• Main Authors: Balewski, Jan T. (Contributor), Betancourt, Michael Joseph (Contributor), Corliss, Ross Cameron (Contributor), Hays-Wehle, James Prewitt (Contributor), Leight, William Axel (Contributor), Redwine, Robert P. (Contributor), Seele, J. (Contributor), Steadman, Stephen G. (Contributor), Surrow, Bernd (Contributor), van Nieuwenhuizen, Gerrit Jan (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2012-10-23T15:35:40Z.
• Subjects: Article
• Online Access: Get fulltext

 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.