Measurements of Diffractive Vector-Meson Photoproduction at High Momentum Transfer from the ZEUS Experiment at HERA · arXivDesk
hep-ex/0010079Oct 31, 2000Contributed to the proceedings of DPF2000, the meeting of the Division of Particles and Fields of the American Physical Society, August 9-12, 2000, Columbus, Ohio, USA (3 pages including 2 figures) Replaced to remove postscript format error. Transparencies are available at http://www-zeus.physik.uni-bonn.de/~critten/dpf2000/dpft/index.html
Measurements of Diffractive Vector-Meson Photoproduction at High Momentum Transfer from the ZEUS Experiment at HERA
We discuss recent preliminary results on the diffractive photoproduction of , φ, and mesons at high momentum transfer reported by the ZEUS collaboration at HERA. A special-purpose calorimeter served to tag the quasi-real photons (<0.01) in the process γ+p→VM+Y, where Y represents a dissociated state of the proton. The resulting range in photon-proton center-of-mass energy extends from 80 to 120 . The differential cross sections
Nearby in the stack
(σ/ t)
were obtained in the region
>1.2
, where
t
denotes the squared momentum transfer to the proton. The measurements provide good sensitivity to the observed power-law dependence
(σ/ t) ∝ (-t)⁻ⁿ
. Over the region in momentum transfer covered by the data, the power is found to be approximately