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- W3098083264 abstract "We present a summary of recent photoproduction results in ultra peripheral relativistic heavy ions collisions with STAR. These collisions have impact parameters larger then twice the nuclear radius; the nuclei do not physically collide, but interact via long-range electromagnetic fields. We observe exclusive ρ0 production as well as AuAu → Au*Au*ρ0 with accompanying mutual nuclear excitation at sNN = 200 GeV. We report the ρ0 production cross section for both coherent and incoherent coupling accompanied by mutual nuclear excitation. We have studied the cross section as a function of pT, yρ0 and Mππ and compared it to theoretical models. In addition, we measured the ρ0 helicity matrix elements. They are found to be consistent with s-channel helicity conservation. The ratio of coherent ρ0 and direct π+π− pair photoproduction has been measured and found to be consistent with earlier measurements. The 4-pion final state AuAu → π+π−π+π− state has also been observed." @default.
- W3098083264 created "2020-11-23" @default.
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- W3098083264 date "2008-11-01" @default.
- W3098083264 modified "2023-10-05" @default.
- W3098083264 title "Photoproduction in Ultra-Peripheral Relativistic Heavy Ion Collisions with STAR" @default.
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- W3098083264 doi "https://doi.org/10.1016/j.nuclphysbps.2008.09.154" @default.
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