The Tensor Pomeron and Low-x Deep Inelastic Scattering
| Title: | The Tensor Pomeron and Low-x Deep Inelastic Scattering |
|---|---|
| Authors: | Britzger, Daniel, Ewerz, Carlo, Glazov, Sasha, Nachtmann, Otto, Schmitt, Stefan |
| Source: | Phys. Rev. D 100, 114007 (2019) |
| Publication Year: | 2019 |
| Collection: | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| Subject Terms: | High Energy Physics - Phenomenology, High Energy Physics - Experiment |
| More Details: | The tensor-pomeron model is applied to low-x deep-inelastic lepton-nucleon scattering and photoproduction. We consider c.m. energies in the range 6 - 318 GeV and Q^2 < 50 GeV^2. 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 f_2-reggeon exchange which 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 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 x < 0.01 is made. Our model gives a very good description of the transition from the small-Q^2 regime where the real or virtual photon behaves hadron-like to the large-Q^2 regime where hard scattering dominates. Our fit allows us, for instance, a determination of the intercepts of the hard pomeron as 1.3008(+73,-84), of the soft pomeron as 1.0935(+76,-64), and of the f_2 reggeon. 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. Comment: 47 pages |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevD.100.114007 |
| Access URL: | http://arxiv.org/abs/1901.08524 |
| Accession Number: | edsarx.1901.08524 |
| Database: | arXiv |
| DOI: | 10.1103/PhysRevD.100.114007 |
|---|