Journal article
Measurement of elastic J/ψ photoproduction at HERA
Zeitschrift für Physik. C, Particles and fields, Vol.75(2), pp.215-228
06/23/1997
DOI: 10.1007/s002880050464
Abstract
The reaction γ p → J/ψ p has been studied in ep interactions using the ZEUS detector at HERA. The cross section for elastic J/ψ photoproduction has been measured as a function of the photon-proton centre of mass energy W in the range 40 < W < 140 GeV at a median photon virtuality Q 2 of 5 × 10−5 GeV2. The photoproduction cross section, σγp→ J/ψp, is observed to rise steeply with W. A fit to the data presented in this paper to determine the parameter δ in the form σγp→ J/ψp α W δ yields the value δ = 0.92±0.14±0.10. The differential cross section dσ/d ¦t¦is presented over the range ¦t¦< 1.0 GeV2 where t is the square of the four-momentum exchanged at the proton vertex. dσ/d ¦t¦falls exponentially with a slope parameter of $4.6pm 0.4_{-0.6}^{+0.4} {⤪ GeV}^{-2}$. The measured decay angular distributions are consistent with s-channel helicity conservation.
Details
- Title: Subtitle
- Measurement of elastic J/ψ photoproduction at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor) - Physics and AstronomyU Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Zeitschrift für Physik. C, Particles and fields, Vol.75(2), pp.215-228
- DOI
- 10.1007/s002880050464
- ISSN
- 0170-9739
- eISSN
- 1431-5858
- Language
- English
- Date published
- 06/23/1997
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627332602771
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