The tensor pomeron and low-x deep inelastic scattering

• Verfasst von: Britzger, Daniel [VerfasserIn]
• Verfasst von: Ewerz, Carlo [VerfasserIn]
• Verfasst von: Glazov, S. [VerfasserIn]
• Verfasst von: Nachtmann, Otto [VerfasserIn]
• Verfasst von: Schmitt, Stefan [VerfasserIn]
• Titel: The tensor pomeron and low-x deep inelastic scattering
• Verf.angabe: Daniel Britzger, Carlo Ewerz, Sasha Glazov, Otto Nachtmann, Stefan Schmitt
• E-Jahr: 2019
• Jahr: 24 Jan 2019
• Umfang: 47 S.
• Fussnoten: Gesehen am 21.02.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Ridge, NY : American Physical Society, 2016
• Jahr Quelle: 2019
• Band/Heft Quelle: 100(2019,11) Artikel-Nummer 114007, 47 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.100.114007
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: High Energy Physics - Experiment
• Sach-SW: High Energy Physics - Phenomenology
• K10plus-PPN: 1690567821

Abstract

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.