# Dilepton mass spectra in p+p collisions at $\sqrt{s}$= 200 GeV and the contribution from open charm

Abstract : 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.
Document type :
Journal articles
Physics Letters B, Elsevier, 2009, 670, pp.313-320. <10.1016/j.physletb.2008.10.064>

http://hal.in2p3.fr/in2p3-00238358
Contributor : Dominique Girod <>
Submitted on : Monday, February 4, 2008 - 2:25:41 PM
Last modification on : Friday, September 11, 2015 - 9:56:47 AM

### Citation

A. Baldisseri, H. Borel, J.-L. Charvet, J. Gosset, H. Pereira, et al.. Dilepton mass spectra in p+p collisions at $\sqrt{s}$= 200 GeV and the contribution from open charm. Physics Letters B, Elsevier, 2009, 670, pp.313-320. <10.1016/j.physletb.2008.10.064>. <in2p3-00238358>

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