Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Poster – Instrumentation

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 Hu21Forschungszentrum 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.

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