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Physics Letters B 670 (2009) 313-320
Dilepton mass spectra in p+p collisions at $\sqrt{s}$= 200 GeV and the contribution from open charm
A. Baldisseri1, H. Borel1, J.-L. Charvet1, J. Gosset1, H. Pereira1, C. Silvestre1, F. Staley1, E.T. Atomssa2, O. Drapier2, F. Fleuret2, M. Gonin2, R. Granier de Cassagnac2, A. Rakotozafindrabe2, A. Romana2, V.-N. Tram2, S. Gadrat3, G. Roche3, P. Rosnet3, M.P. Comets4, D. Jouan4, C. Suire4, I. Garishvili5, D. Hornback5, Y. Kwon5, K.F. Read5, S.P. Sorensen5, Additional Authors Not Shown
PHENIX Collaboration(s)

The 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) \mu b, which is consistent with QCD calculations and measurements of single leptons by PHENIX.
1 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :  LLR - Laboratoire Leprince-Ringuet
3 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
5 :  SUBATECH - Laboratoire SUBATECH Nantes
Physique/Physique des Hautes Energies - Expérience
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