Ultra-peripheral collisions (UPC) of heavy-ions involve long range electromagnetic interactions at impact parameters twice larger than the nuclear radius, where no nucleonnucleon collisions occur. The first measurement of photoproduction of J/ψ and of two-photon production of high-mass e +e-. pairs in ultra-peripheral nucleus-nucleus interactions will be presented, using Au+Au data at √sNN = 200 GeV. The measured cross sections at midrapidity are consistent with various theoretical predictions. .
|Publication status||Published - Dec 1 2009|
|Event||17th International Workshop on Deep-Inelastic Scattering and Related Topics, DIS 2009 - Madrid, Spain|
Duration: Apr 26 2009 → Apr 30 2009
|Other||17th International Workshop on Deep-Inelastic Scattering and Related Topics, DIS 2009|
|Period||4/26/09 → 4/30/09|
ASJC Scopus subject areas