Baryon scattering at high energies: wave function, impact factor, and gluon radiation
| Jazyk: | English |
|---|---|
| DOI: | 10.1140/epjc/s10052-008-0572-z |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d08d080635fb027cc824121658acdac http://arxiv.org/abs/0711.2196 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....7d08d080635fb027cc824121658acdac |
| Autor: | L. Motyka, Jochen Bartels |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Quark
perturbation theory [quantum chromodynamics] Particle physics small-x integral equations Physics and Astronomy (miscellaneous) Lipatov equation diquark [quark] High Energy Physics::Lattice Nuclear Theory momentum dependence FOS: Physical sciences Pomeron High Energy Physics - Phenomenology (hep-ph) helicity [quark] scattering amplitude [baryon] ddc:530 coupling [odderon] wave function [baryon] Wave function Nuclear Experiment Engineering (miscellaneous) Physics radiation [gluon] Scattering Regge poles [gluon] High Energy Physics::Phenomenology Perturbative QCD multigluon [coupling] Gluon Baryon Scattering amplitude High Energy Physics - Phenomenology valence [quark] High Energy Physics::Experiment |
| Zdroj: | European journal of physics 55(1), 65-83 (2008). doi:10.1140/epjc/s10052-008-0572-z arXiv E-Print (only) (2007). |
| DOI: | 10.1140/epjc/s10052-008-0572-z |
| Popis: | The scattering of a baryon consisting of three massive quarks is investigated in the high energy limit of perturbative QCD. A model of a relativistic proton-like wave function, dependent on valence quark longitudinal and transverse momenta and on quark helicities, is proposed, and we derive the baryon impact factors for two, three and four t-channel gluons. We find that the baryonic impact factor can be written as a sum of three pieces: in the first one a subsystem consisting of two of the three quarks behaves very much like the quark-antiquark pair in gamma* scattering, whereas the third quark acts as a spectator. The second term belongs to the odderon, whereas in the third (C-even) piece all three quarks participate in the scattering. This term is new and has no analogue in gamma* scattering. We also study the small x evolution of gluon radiation for each of these three terms. The first term follows the same pattern of gluon radiation as the gamma*-initiated quark-antiquark dipole, and, in particular, it contains the BFKL evolution followed by the 2-->4 transition vertex (triple Pomeron vertex). The odderon-term is described by the standard BKP evolution, and the baryon couples to both known odderon solutions, the Janik-Wosiek solution and the BLV solution. Finally, the t-channel evolution of the third term starts with a three reggeized gluon state which then, via a new 3-->4 transition vertex, couples to the four gluon (two-Pomeron) state. We briefly discuss a few consequences of these findings, in particular the pattern of unitarization of high energy baryon scattering amplitudes. 36 pages, 16 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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