Dilepton mass spectra in p+p collisions at $\sqrt{s}$= 200 GeV and the contribution from open charm - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2009

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

R. Granier de Cassagnac
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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.

Dates and versions

in2p3-00238358 , version 1 (04-02-2008)

Identifiers

Cite

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, 2009, 670, pp.313-320. ⟨10.1016/j.physletb.2008.10.064⟩. ⟨in2p3-00238358⟩
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