Design and Performance of a Lead Fluoride Detector as a Luminosity Monitor

Abstract

Precise luminosity measurements for the OLYMPUS two-photon exchange experiment at DESY were performed by counting scattering events with alternating beams of electrons and positrons incident on atomic electrons in a gaseous hydrogen target. Final products of Møller, Bhabha, and pair annihilation interactions were observed using a pair of lead fluoride Cherenkov calorimeters with custom housings and electronics, adapted from a system used by the A4 parity violation experiment at MAMI. This paper describes the design, calibration, and operation of these detectors. An explanation of the Monte Carlo methods used to simulate the physical processes involved both at the scattering vertices and in the detector apparatus is also included.

arXiv comment12 pages, 13 figures

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• How to reconcile the Rosenbluth and the polarization transfer method in the measurement of the proton form factors
• Review of two-photon exchange in electron scattering
• Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2
• The OLYMPUS Experiment
• Measurements and simulations of Cherenkov light in lead fluoride crystals
• QED Radiative Corrections to Low-Energy Moller and Bhabha Scattering

Cited by in corpus (6)

• Two-photon exchange in elastic electron-proton scattering
• Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering: Determined by the OLYMPUS Experiment
• A novel technique for determining luminosity in electron-scattering/positron-scattering experiments from multi-interaction events
• Measurement and tricubic interpolation of the magnetic field for the OLYMPUS experiment
• Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment
• Measuring the lepton sign asymmetry in elastic electron-proton scattering with OLYMPUS