Speaker
Description
The elastic proton-proton scattering at low momentum transfer can be described by a combination of Coulomb interaction, hadronic interaction and an interference term. While the Coulomb part is well understood and dominant for very small momentum transfer, the interference part is a mostly phenomenological description where the available data to extract parameters in the range of 1 GeV/c to 10 GeV/c is rather limited. A measurement at GSI utilizing the SIS18 beam with up to 4.2 GeV/c is currently in preparation for spring 2027. To reduce uncertainties all particles involved in the scattering process will be measured using silicon pixel sensors (HV-MAPS). The scattered proton trajectory will be measured in vacuum using a new small beam telescope developed in Mainz. For the recoil proton a new setup measuring close to the target is under construction in Mainz as well, while the precise beam position will be measured using an existing telescope currently in Bochum. Together with existing PANDA targets this will allow a precision measurement with good control of systematic errors. The experiment and its detectors will be presented.