Applications of the chiral potential with the semi-local regularization in momentum space to the disintegration processes

• Published in: arXiv.org 2020-07
• Main Authors: Urbanevych, V, Skibiński, R, Witała, H, Golak, J, Topolnicki, K, Grassi, A, Epelbaum, E, Krebs, H
• Format: Article
• Language: English
• Subjects: Convergence; Cross-sections; Deuterons; Disintegration; Mathematical analysis; Momentum; Neutrinos; Nucleon potential; Photodisintegration; Photons; Polarization; Regularization
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2007.14836

We apply the chiral potential with the momentum space semi-local regularization to the \(^2\)H and \(^3\)He photodisintegration processes and to the (anti)neutrino induced deuteron breakup reactions. Specifically, the differential cross section, the photon analyzing power and the final proton polarization have been calculated for the deuteron photodisintegration at the photon energies 30 MeV and 100 MeV. For the \(^3\)He photodisintegration predictions for the semi-inclusive and exclusive differential cross sections are presented for the photon energies up to 120 MeV. The total cross section is calculated for the (anti)neutrino disintegrations of the deuteron for the (anti)neutrino energies below 200 MeV. The predictions based on the Argonne V18 potential or on the older chiral force with regularization applied in coordinate space are used for comparison. Using the fifth order chiral nucleon-nucleon potential supplemented with dominant contributions from the sixth order allows us to obtain converged predictions for the regarded reactions and observables. Our results based on the newest semi-local chiral potentials show even smaller cutoff dependence for the considered electroweak observables than the previously reported ones with a coordinate-space regulator. However, some of the studied polarization observables in the deuteron photodisintegration process reveal more sensitivity to the regulator value than the unpolarized cross section. The chiral potential regularized semi-locally in momentum space yields also fast convergence of results with the chiral order. These features make the used potential a high quality tool to study electroweak processes.