Journal
PHYSICS LETTERS B
Volume 679, Issue 4, Pages 321-329Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2009.07.061
Keywords
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Funding
- Office of Nuclear Physics in DOE Office of Science and NSF (USA)
- MEXT
- JSPS Oapan
- CNPq
- FAPESP (Brazil)
- NSFC (China)
- IN2P3/CNRS
- CEA (France)
- BIVIBF, DAAD
- AvH (Germany),
- OTKA (Hungary)
- DAE (India)
- ISF (Israel)
- KRF
- KOSEF (Korea)
- MES
- RAS
- FAAE (Russia)
- VR
- KAW (Sweden)
- US CRDF for the FSU
- US-Hungarian NSF-OTKA-MTA
- US-Israel BSF
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We present the first measurement of photoproduction of J/psi and of two-photon production of high-mass e(+)e(-) pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at root s(NN) = 200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au* nuclei. The event sample consists of 28 events with m(e+e-) > 2 GeV/c(2) with zero like-sign background. The measured cross sections at midrapidity of d sigma/dy (J/psi + Xn, y = 0) = 76 +/- 33 (stat) +/- 11 (syst) pb and d(2)sigma /dm dy (e(+) e(-) + Xn, y = 0) = 86 +/- 23(stat) +/- 16(syst) mu b/ (GeV/c(2)) for m(e+e-) epsilon vertical bar 2.0, 2.8 vertical bar GeV/c(2) have been compared and found to be consistent with models for photoproduction of J/psi and QED based calculations of two-photon production of e(+)e(-) pairs. (C) 2009 Elsevier B.V. All rights reserved.
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