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Proceedings of XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2018)
Coherent photoproduction of vector mesons is sensitive to the shape of the target nucleus, as probed at four-momentum scale Q 2 ∝ (M V /2) 2 . Previously STAR presented a high-statistics measurement of dσ c /dt for coherent π + π − photoproduction in ultra-peripheral gold-gold collisions, and made a two-dimensional Fourier-Bessel (Hanckel) transformation to give the transverse distribution of interactions in the nucleus. Here, we study how dσ c /dt evolves with Q 2 . We divide the π + π −doi:10.22323/1.316.0047 fatcat:elzhfx2qm5girasrbglmzcd63q