Dilepton mass spectra in p+p collisions at sqrt(s)= 200 GeV and the contribution from open charm

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dc.creatorPHENIX Collaboration
dc.creatorAdare, A.
dc.date2008-02-01
dc.date2008-02-05
dc.date.accessioned2026-07-07T12:29:58Z
dc.date.available2026-07-07T12:29:58Z
dc.descriptionThe PHENIX experiement has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c^2 in p+p collisions at sqrt(s)=200 GeV. The contributions from light meson decays to e^+e^- pairs have been determined based on measurements of hadron production cross sections by PHENIX. They account for nearly all e^+e^- pairs in the mass region below 1 GeV/c^2. The e^+e^- pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) μb, which is consistent with QCD calculations and measurements of single leptons by PHENIX.
dc.description375 authors from 57 institutions, 18 pages, 4 figures, 2 tables. Submitted to Physics Letters B. v2 fixes technical errors in matching authors to institutions. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
dc.identifierhttps://arxiv.org/abs/0802.0050
dc.identifierhttp://arxiv.org/abs/0802.0050
dc.identifierPhys.Lett.B670:313-320,2009
dc.identifierdoi:10.1016/j.physletb.2008.10.064
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216012
dc.subjectHigh Energy Physics - Experiment
dc.titleDilepton mass spectra in p+p collisions at sqrt(s)= 200 GeV and the contribution from open charm
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