Abstract
We systematically study exclusiv2 diffractive (photo)production of vector mesons (, , , and ) off protons in high-energy collisions and investigate whether the production is a sensitive probe of gluon saturation. We confront saturation-based results for diffractive and production at HERA and photoproduction with all available data, including recent work from HERA, ALICE, and LHCb, finding good agreement. In particular, we show that the distribution of differential cross sections of photoproduction of vector mesons offers a unique opportunity to discriminate among saturation and nonsaturation models. This is due to the emergence of a pronounced dip (or multiple dips) in the distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible that can be traced back to the unitarity features of color dipole amplitude in the saturation regime. We show that in saturation models the dips in distribution recede towards lower with decreasing mass of the vector meson, increasing energy or decreasing Bjorken-, and decreasing virtuality . We provide various predictions for exclusive (photo)production of different vector mesons including the ratio of at HERA, the LHC, and future colliders.
5 More- Received 22 July 2014
DOI:https://doi.org/10.1103/PhysRevD.90.054003
© 2014 American Physical Society