München 2019 – wissenschaftliches Programm
HK 54.12: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium
Radiative corrections on pp → e+e− with the PANDA experiment at FAIR — •Manuel Zambrana1,2, Alaa Dbeyssi1, Frank Maas1,2,3, Egle Tomasi-Gustafsson4, Yury M. Bystritskiy5, Vladimir A. Zykunov5, Samer Ahmed1,2, Luigi Capozza1, Phillip Grasemann1,2, Oliver Noll1,2, David Rodríguez Piñeiro1, Sahra Wolff1,2, and Iris Zimmermann1,2 — 1Helmholtz-Institut Mainz, Germany — 2Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany — 3Prisma Cluster of Excellence, Mainz, Germany — 4CEA, IRFU, SPhN, Saclay, France — 5Joint Institute for Nuclear Research, Dubna, Russia
First order radiative corrections to pp → e+e− have been calculated in the proton point-like approximation, including both virtual and real corrections, and interference effects. Soft and hard photon emission regimes are covered in the calculation. In the soft photon regime, divergences from singular virtual diagrams are cancelled in pairs with the corresponding ones from real diagrams. On the other hand, the regularisation of infrared divergences of the bremsstrahlung cross section is achieved by the use of a small photon mass as a parameter, which makes the calculation suitable in both the soft and hard photon regime. The calculated cross section is the basis of an event generator to be used in the framework of the future PANDA experiment, where the expected precision in the measurement of the timelike electromagnetic form factors of the proton will demand a next-to-leading order differential cross section.