Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV
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-e...
Main Authors: | , , , , , , , , , |
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Other Authors: | , |
Format: | Article |
Language: | English |
Published: |
American Physical Society,
2012-10-23T15:35:40Z.
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Subjects: | |
Online Access: | Get fulltext |
Summary: | 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. |
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