München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.12: Poster

Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium

Radiative corrections on pp → e⁺e⁻ with the PANDA experiment at FAIR — •Manuel Zambrana^1,2, Alaa Dbeyssi¹, Frank Maas^1,2,3, Egle Tomasi-Gustafsson⁴, Yury M. Bystritskiy⁵, Vladimir A. Zykunov⁵, Samer Ahmed^1,2, Luigi Capozza¹, Phillip Grasemann^1,2, Oliver Noll^1,2, David Rodríguez Piñeiro¹, Sahra Wolff^1,2, and Iris Zimmermann^1,2 — 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.