| Thème(s) : |
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Physique/Physique des Hautes Energies - Expérience
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| Titre : |
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Dilepton mass spectra in p+p collisions at $\sqrt{s}$= 200 GeV and the contribution from open charm |
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| Auteur : |
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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 |
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| Laboratoire : |
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| Résumé : |
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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. |
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| Collaboration/Projet : |
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PHENIX |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication ou d'écriture : |
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2009 |
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| Nom du périodique : |
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| Physics Letters B (Phys. Lett. B) |
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Elsevier |
| ISSN |
0370-2693 |
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| Volume : |
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670 |
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| Page/Article : |
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313-320 |
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| Commentaire : |
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375 authors from 57 institutions, 17 pages, 4 figures, 2 tables. Submitted to Physical Review Letters. 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 |
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