Diffractive two-meson electroproduction with a nucleon and deuteron target
Autor: | Wim Cosyn, Bernard Pire, Lech Szymanowski |
---|---|
Přispěvatelé: | Dept of Physics and Astronomy, Ghent University, Florida International University [Miami] (FIU), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), National Center for Nuclear Research [Warsaw] (NCBJ), National Center for Nuclear Research (NCBJ) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Quark
Particle physics Nuclear Theory Meson High Energy Physics::Lattice Hadron FOS: Physical sciences Parton 01 natural sciences Nuclear Theory (nucl-th) Pomeron High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Vector meson Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology 3. Good health High Energy Physics - Phenomenology GPDS Physics and Astronomy [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] High Energy Physics::Experiment Production (computer science) Nucleon |
Zdroj: | Physical Review Physical Review D PHYSICAL REVIEW D |
ISSN: | 2470-0010 2470-0029 0038-5646 0038-5506 |
Popis: | The diffractive electro- or photo-production of two mesons separated by a large rapidity gap gives access to generalized parton distributions (GPDs) in a very specific way. First, these reactions allow to easily access the chiral-odd transversity quark GPDs by selecting one of the produced vector meson to be transversely polarized. Second, they are only sensitive to the so-called ERBL region where GPDs are not much constrained by forward quark distributions. Third, the skewness parameter $\xi$ is not related to the Bjorken $x_\text{Bj}$ variable, but to the size of the rapidity gap. We analyze different channels ($\rho_L^0\,\rho_{L/T}, \rho^0_L\,\omega_{L/T}$ and $\rho^0_L\,\pi$ production) on nucleon and deuteron targets. The analysis is performed in the kinematical domain where a large momentum transfer from the photon to the diffractively produced vector meson introduces a hard scale (the virtuality of the exchanged hard Pomeron). This enables the description of the hadronic part of the process in the framework of collinear factorization of GPDs. We show that the unpolarized cross sections depend very much on the parameterizations of both chiral-even and chiral-odd quark distributions of the nucleon, as well as on the shape of the meson distribution amplitudes. The rates are shown to be in the range of the capacities of a future electron-ion collider. Comment: 20 pages, 15 figures |
Databáze: | OpenAIRE |
Externí odkaz: |