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- Title
Probing proton structure with cc¯ correlations in ultraperipheral pA collisions.
- Authors
Linek, Barbara; Łuszczak, Agnieszka; Łuszczak, Marta; Pasechnik, Roman; Schäfer, Wolfgang; Szczurek, Antoni
- Abstract
We study the exclusive diffractive c c ¯ photoproduction in ultraperipheral pA collisions. The formalism makes use of off-diagonal generalizations of the unintegrated gluon distribution, the so-called generalized transverse momentum dependent distributions (GTMDs). We present two different formulations. The first one is based directly on gluon GTMD parametrizations in momentum space. Another option is the calculation of the GTMD as a Fourier transform of the dipole-nucleon scattering amplitude N(Y, r → ⊥, b → ⊥). The latter approach requires some extra regularization discussed in the paper. Different dipole amplitudes from the literature are used. Compared to previous calculations in the literature, we integrate over the full phase space and therefore cross sections for realistic conditions are obtained. We present distributions in rapidity of c or c ¯ , transverse momentum of the c c ¯ pair, four-momentum transfer squared as well as the azimuthal correlation between a sum and a difference of the c and c ¯ transverse momenta. The azimuthal correlations are partially due to the so-called elliptic gluon Wigner distribution. Different models lead to different modulations in the azimuthal angle. The modulations are generally smaller than 5%. They depend on the range of transverse momentum selected for the calculation.
- Subjects
MOMENTUM space; MOMENTUM distributions; WIGNER distribution; SCATTERING amplitude (Physics); PHASE space; GLUONS
- Publication
Journal of High Energy Physics, 2023, Vol 2023, Issue 10, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP10(2023)179