Abstract
The tensor-Pomeron model is applied to low- deep inelastic lepton-nucleon scattering and photoproduction. We consider c.m. energies in the range 6–318 GeV and . In addition to the soft tensor Pomeron, which has proven quite successful for the description of soft hadronic high-energy reactions, we include a hard tensor Pomeron. We also include -Reggeon and -Reggeon exchange. The sum of these latter exchanges turns out to be particularly relevant for real-photon-proton scattering at c. m. energies in the range up to 30 GeV. The combination of all these exchanges permits a description of the absorption cross sections of real and virtual photons on the proton in the same framework. In particular, a detailed comparison of this two-tensor-Pomeron model with the latest HERA data for is made. Our model gives a very good description of the transition from the small- regime where the real or virtual photon behaves hadronlike to the large- regime where hard scattering dominates. Our fit allows us, for instance, a determination of the intercepts of the hard Pomeron as , of the soft Pomeron as , and of the plus Reggeons. We find that in photoproduction the hard Pomeron does not contribute within the errors of the fit. We show that assuming a vector instead of a tensor character for the Pomeron leads to the conclusion that it must decouple in real photoproduction and in the DIS structure functions.
10 More- Received 27 March 2019
DOI:https://doi.org/10.1103/PhysRevD.100.114007
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society