An Aerogel Čerenkov Counter for Pion Rejection in the G0 Experiment

Details An Aerogel Čerenkov Counter for Pion Rejection in the G0 Experiment An Aerogel Čerenkov Counter for Pion Rejection in the G0 Experiment

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre13005h&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The G0 experiment at JLab will measure the parity violating electron-nucleon asymmetries over a momentum transfer range of Q^2 = 0.1 - 1.0 (GeV/c)^2 in order to determinine the nucleon's strange form factors G_E^s and G_M^s. Measurements at both forward and backward angles are necessary for separating the two form factors from the asymmetry results. The backward angle measurements are mostly sensitive to G_M^s, but have a potentially large radiative correction from the axial electric form factor of the nucleon. This correction can be determined from backward angle measurements with deuterium. The negative pion background in the backward angle runs has been shown to be large. In the deuterium case, separation of the quasielastic electrons from the pion background will require the use of an aerogel Čerenkov counter capable of at least a 100:1 pion rejection for pion momenta up to 400 MeV/c. In this talk we describe the design and construction of a diffusely reflective aerogel Čerenkov counter, and report on the results from pion rejection tests performed at the M11 pion channel at TRIUMF. The experimental results are compared with a Geant4 simulation of the counter.

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