Publications (4)0 Total impact
N. Liyanage J. Mitchell T. Pussieux R. D. Ransome R. Suleiman J. Templon T. Teresawa J. Thompson R. Tieulent P. E. Ulmer. 03/2004; 331218123327819(19).
Article: New measurement of parity violation in elastic electron-proton scattering and implications for strange form factors
Article: New measurement of parity violation in elastic electron–proton scattering and implications for strange form factors[show abstract] [hide abstract]
ABSTRACT: We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The result is A=−15.05±0.98(stat)±0.56(syst) ppm at the kinematic point 〈θlab〉=12.3° and 〈Q2〉=0.477 (GeV/c)2. Both errors are a factor of two smaller than those of the result reported previously. The value for the strange form factor extracted from the data is , where the first error is experimental and the second arises from the uncertainties in electromagnetic form factors. This measurement is the first fixed-target parity violation experiment that used either a “strained” GaAs photocathode to produce highly polarized electrons or a Compton polarimeter to continuously monitor the electron beam polarization.Physics Letters B.
Article: A photon calorimeter using lead tungstate crystals for the CEBAF Hall A Compton polarimeter[show abstract] [hide abstract]
ABSTRACT: A new Compton polarimeter is built on the CEBAF Hall A electron beam line. Performances of 10% resolution and 1% calibration are required for the photon calorimeter of this polarimeter. This calorimeter is built with lead tungstate scintillators coming from the CMS electromagnetic calorimeter R&D. Beam tests of this detector have been made using the tagged photon beam line at MAMI, Mainz, and a resolution of has been measured.Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.