The Double Spin Asymmetry for Exclusive pi+ Production With CLAS

Conference · Mon Oct 01 00:00:00 EDT 2007

OSTI ID:1964033

Pierce, Joshua ^[1]

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1. University of Virginia

The eg1b run was conducted using CLAS at Jefferson Lab using a 1.6 GeV - 5.6 GeV longitudinally polarized electron beam and polarized nuclear targets (composed of NH3 and ND3). This analysis is of the double spin asymmetry Aet in the exclusive production of positive pions from a polarized proton (ep --> epi+n). The double spin asymmetry was measured as a function of the four kinematic variables W, Q2, cos theta* (the angle between the direction of the virtual photon and the produced pion), and ?phi* (the angle between the lepton interaction plane and the hadron interaction plane). The value of this asymmetry can be used to determine the spin structure of the resonances. A brief description of the experimental setup will be given, and preliminary results will be shown.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1964033
• Report Number(s): JLAB-PHY-07-954; DOE/OR/23177-5904
• Country of Publication: United States
• Language: English