Dilepton mass spectra in p+p collisions at s**(1/2) = 200-GeV and the contribution from open charm - INSPIRE

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Dilepton mass spectra in p+p collisions at s**(1/2) = 200-GeV and the contribution from open charm

PHENIX

Collaboration

Feb, 2008

18 pages

Published in:

Phys.Lett.B 670 (2009) 313-320

e-Print:

0802.0050 [hep-ex]

DOI:

10.1016/j.physletb.2008.10.064

Experiments:

BNL-RHIC-PHENIX

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Abstract: (Elsevier)

PHENIX has measured the electron–positron pair mass spectrum from 0 to 8 GeV/c2 in p+p collisions at 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. Within the systematic uncertainty of ∼20% they account for all e+e− pairs in the mass region below ∼1 GeV/c2 . 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) μb , which is consistent with QCD calculations and measurements of single leptons by PHENIX.

Note:

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

p p: colliding beams
electron: pair production
mass spectrum: dilepton
meson: hadroproduction
meson: leptonic decay
meson: radiative decay
charmed meson: semileptonic decay
charm
bottom
quark: pair production

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