期刊
PHYSICS LETTERS B
卷 670, 期 4-5, 页码 313-320出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2008.10.064
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资金
- Department of Energy (USA)
- NSF (USA)
- MEXT (Japan)
- JSPS (Japan)
- CNPq (Brazil)
- FAPESP (Brazil)
- NSFC (China)
- IN2P3/CNRS (France)
- CEA (France)
- BMBF (Germany)
- DAAD (Germany)
- AvH (Germany)
- OTKA (Hungary)
- DAE (India)
- ISF (Israel)
- KRF (Korea)
- KOSEF (Korea)
- MES (Russia)
- RAS (Russia)
- FAAE (Russia)
- VR (Sweden)
- KAW (Sweden)
- US CRDF
- US-Hungarian NSF-OTKA-MTA
- US-Israel BSF
- Division Of Physics
- Direct For Mathematical & Physical Scien [855569] Funding Source: National Science Foundation
PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root 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 similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 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) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved.
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