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Dilepton mass spectra in p+p collisions at $\sqrt(s)$= 200 GeV and the contribution from open charm
Baldisseri A., Borel H., Charvet J.-L., Gosset J., Pereira H. et al
Physics Letters B 670 (2009) 313-320 - http://hal.in2p3.fr/in2p3-00238358
Physique/Physique des Hautes Energies - Expérience
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
1 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :  LLR - Laboratoire Leprince-Ringuet
CNRS : UMR7638 – IN2P3 – Polytechnique - X
Route de Saclay - 91128 Palaiseau Cedex
3 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
5 :  SUBATECH - Laboratoire SUBATECH Nantes
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
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.

Articles dans des revues avec comité de lecture
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 

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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