Photoproduction of J/psi and of high mass e(+)e(-) in ultra-peripheral Au plus Au collisions at root s(NN)=200 GeV
Description
We present the first measurement of photoproduction of J/Ψ and of two-photon production of high-mass e+e- pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at √sNN. 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 me+e- > 2 GeV/c2 with zero like-sign background. The measured cross sections at midrapidity of dσ/dy (J/Ψ + Xn, y = 0) = 76 ± 33(stat) ± 11(syst) μb and d2σ/dm dy (e+e- + Xn, y = 0) = 86 ± 23(stat) ± 16(syst) μb/(GeV/c2) for me+e- (elementof) [2.0,2.8] GeV/c2 have been compared and found to be consistent with models for photoproduction of J/Ψ and QED based calculations of two-photon production of e+e- pairs.
Additional details
Identifiers
- DOI
- 10.1016/j.physletb.2009.07.061;
- arXiv
- arXiv:0903.2041v1;
Publishing Information
- Journal Title
- Physics Letters. Section B
- Journal Volume
- 679
- Journal Issue
- 4
- Journal Page Range
- p. 321-329
- ISSN
- 0370-2693
- CODEN
- PYLBAJ
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- United States
- INIS RN
- 43079179
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- COULOMB EXCITATION; CROSS SECTIONS; NEUTRONS; NUCLEI; PHOTOPRODUCTION
- Descriptors DEC
- BARYONS; BASIC INTERACTIONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; EXCITATION; FERMIONS; HADRONS; INTERACTIONS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION
Optional Information
- Contract/Grant/Project number
- KB0201021; AC02-98CH10886
- Notes
- doi 10.1016/j.physletb.2009.07.061
- Collaborations
- PHENIX Collaboration
- Funding organization
- USDOE SC Office of Science (United States)
- Secondary number(s)
- BNL--90648-2009-JA