Photoproduction of J / ψ and of high mass e+ e- in ultra-peripheral Au + Au collisions at sqrt(sN N) = 200 GeV

@article{Collaboration2009PhotoproductionOJ,
  title={Photoproduction of J / ψ and of high mass e+ e- in ultra-peripheral Au + Au collisions at sqrt(sN N) = 200 GeV},
  author={P. Collaboration and A. Afanasiev and E. al.},
  journal={Physics Letters B},
  year={2009},
  volume={679},
  pages={321-329}
}
We present the first measurement of photoproduction of J/{Psi} and of two-photon production of high-mass e{sup +}e{sup -} pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at {radical}s{sub NN}. 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{sup +}e{sup -} > 2 GeV/c{sup 2} with zero like-sign background. The measured cross sections at… Expand
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