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Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Instrumentierung VIII

HK 46.3: Talk

Wednesday, March 23, 2011, 17:30–17:45, HS1

Antiproton-proton elastic scattering as a day-one experiment at HESR — •Huagen Xu and James Ritman — Forschungszentrum Juelich

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 angle of the scattered antiproton will be reconstructed by measuring the 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 angle by tracking detectors and by thick energy detectors near 90 polar angle area, respectively. The conceptual design of day-one experiment is nearly finished. The commissioning of devices with proton-proton elastic scattering will take place at COSY.

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