Measurements of Diffractive Vector-Meson Photoproduction at High Momentum Transfer from the ZEUS Experiment at HERA

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dc.creatorCrittenden, J. A.
dc.date2000-10-31
dc.date2000-11-03
dc.date.accessioned2026-07-07T03:34:14Z
dc.date.available2026-07-07T03:34:14Z
dc.descriptionWe discuss recent preliminary results on the diffractive photoproduction of {\rhoz}, $ϕ$, and {\jpsi} mesons at high momentum transfer reported by the ZEUS collaboration at HERA. A special-purpose calorimeter served to tag the quasi-real photons ($\qsq<0.01 \gevsq$) in the process $γ+ p \to {\rm VM}+ Y$, where $Y$ represents a dissociated state of the proton. The resulting range in photon-proton center-of-mass energy extends from 80 to 120 \gev. The differential cross sections $\frac{\Dσ}{\D t}$ were obtained in the region ${\abst}>1.2 \gevsq$, where $t$ denotes the squared momentum transfer to the proton. The measurements provide good sensitivity to the observed power-law dependence $\frac{\Dσ}{\D t} \propto {(-t)}^{-n}$. Over the region in momentum transfer covered by the data, the power is found to be approximately $n\simeq 3$ for {\rhoz} and $ϕ$ photoproduction, and approximately $n\simeq 2$ for {\jpsi} photoproduction.
dc.descriptionContributed 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
dc.identifierhttps://arxiv.org/abs/hep-ex/0010079
dc.identifierhttp://arxiv.org/abs/hep-ex/0010079
dc.identifierInt.J.Mod.Phys. A16S1A (2001) 187-190
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/36889
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurements of Diffractive Vector-Meson Photoproduction at High Momentum Transfer from the ZEUS Experiment at HERA
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