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- W3149195009 abstract "The STAR Collaboration reports on the photoproduction of π+π− pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly real photon emitted by one ion scatters from the other ion. We fit the π+π− invariant-mass spectrum with a combination of ρ0 and ω resonances and a direct π+π− continuum. This is the first observation of the ω in ultraperipheral collisions, and the first measurement of ρ−ω interference at energies where photoproduction is dominated by Pomeron exchange. The ω amplitude is consistent with the measured γp→ωp cross section, a classical Glauber calculation, and the ω→π+π− branching ratio. The ω phase angle is similar to that observed at much lower energies, showing that the ρ−ω phase difference does not depend significantly on photon energy. The ρ0 differential cross section dσ/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.2 MoreReceived 18 May 2017DOI:https://doi.org/10.1103/PhysRevC.96.054904©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasForm factorsNuclear reactionsNuclear structure & decaysPhoton & charged-lepton interactions with hadronsRelativistic heavy-ion collisionsParticles & FieldsNuclear Physics" @default.
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