Document Type
Article
Publication Date
7-4-1996
Abstract
The production of φ mesons in the reaction e+p → e+φp (φ → K+K-), for 7 < Q2 < 25 GeV2 and for virtual photon-proton centre of mass energies (W) in the range 42-134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar Q2, the results show that the γp → p0p cross section rises strongly with W. This behaviour is similar to that previously found for the γ*p → p0p cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small x. The ratio of σ(φ)/σ(p0), which has previously been determined by ZEUS to be 0.065 ± 0.013 (stat.) in photoproduction at a mean W of 70 GeV, is measured to be 0.18 ± 0.05 (stat.) ± 0.03 (syst.) at a mean Q2 of 12.3 GeV2 and mean W of ≈ 100 GeV and is thus approaching at large Q2 the value of 2/9 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.
Journal Title
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume
380
Issue
1-2
First Page
220
Last Page
234
DOI
10.1016/0370-2693(96)00603-X
First Department
Physics
Recommended Citation
Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Okrasinski, J. R.; Repond, J.; Stanek, R.; Talaga, R. L.; Zhang, H.; Mattingly, Margarita C. K.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Bruni, R.; Cara Romeo, G.; Castellini, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Corradi, M.; Gialas, I.; Giusti, R.; Iacobucci, G.; Laurenti, G.; Levi, G.; Margotti, A.; and Massam, T., "Measurement of the Reaction Γ*P→Φp in Deep Inelastic E+P Scattering at HERA" (1996). Faculty Publications. 2667.
https://digitalcommons.andrews.edu/pubs/2667
Acknowledgements
Accepted version retrieved July 19, 2021 from https://arxiv.org/pdf/hep-ex/9604008.pdf