EXPERIMENTAL STATUS DVCS ep → epγ AND en → enγ AT JEFFERSON LAB-HALL A
Abstract
The experiments E00-110 and E03-106 [1] propose to measure the Deep Virtual Compton Scattering process (DVCS) ep → epγ and en → enγ in Hall A at Jefferson Lab with a 5.75 GeV longitudinally polarized electron beam. The exclusivity requires the High Resolution Spectrometer of the Hall A for the detection of the scattered electron (∆p/p = 10-4), an electromagnetic calorimeter for the detection of the real photon (σ/E < 5%) and a scintillator array for the detection of the third particle. A 1 GHz sampling system allows one to deal with pile-up as expected from running detectors at small angles and high luminosity L = 1037 cm-2 s-1. We will describe the apparatus and will explain the method to extract GPDs and evaluate the contributions from higher twists from the measurement of the cross-section difference.
- Publication:
-
GDH 2004
- Pub Date:
- February 2005
- DOI:
- 10.1142/9789812702111_0028
- Bibcode:
- 2005gdh..conf..223F