Mainz 2012 – wissenschaftliches Programm
HK 53.2: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
Antiproton-proton elastic scattering as a day-one experiment at HESR — •Huagen Xu1, James Ritman1, and Qiang Hu2 — 1Forschungszentrum Jülich — 2Institute of Modern Physics CAS
The conceptual design of the luminosity monitor for the PANDA experiment is based on measuring the differential elastic Antiproton-Proton scattering rate. The detector will be located at about 10m downstream of the target and will measure forward outgoing antiprotons which are emitted at angles of 3-8 mrad relative to the beam axis. The polar angle of the scattered antiproton will be reconstructed by measuring its track with 4 planes of silicon strip detectors. The absolute precision is limited by the lack of existing data on this system in the relevant momentum region, therefore a day-one experiment at HESR dedicated to antiproton-proton elastic scattering has been proposed. The goal of this experiment is to measure a wide range of 4-momentum transfer t (0.0008-0.1 GeV2) so that the contribution of the physical differential distributions to the absolute luminosity uncertainty is less than 1%. The polar angle of scattered antiprotons and the energy of recoil protons will be measured at forward angles by tracking detectors and by thick energy detectors near 90∘, respectively. The conceptual design of the day-one experiment is finished. Part of device has been fabricated and commissioning of them with proton-proton elastic scattering will take place at COSY in the upcoming years.