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ELECTROPRODUCTION OF NEUTRAL PION OFF HE Bayram Torayev Old Dominion University, 2016 Director: Dr. Stephen Bueltmann Deeply virtual exclusive processes offer a unique opportunity to study the internal structure of the nucleon and nuclei. The goal of this work is to extract the beam-spin asymmetry in deeply virtual coherent neutral pion electroproduction, eHe→ e′4He′π0, using the CLAS detector in the experimental Hall B at Thomas Jefferson National Accelerator Facility. The data were collected in 2009 with a 6 GeV longitudinally polarized electron beam impinging on a 30 cm long, 6 atm Helium-4 gaseous target. In order to ensure that the process is coherent, a new Radial Time Projection Chamber was used to detect and identify low energy recoil α-particles. The Beam Spin Asymmetry in the coherent deep exclusive regime was measured at Q = 1.50 GeV, xB = 0.18 and −t = 0.14 GeV. The measured asymmetry has an amplitude of 10%±5% and has the opposite sign compared the asymmetry measured for π production on the proton.

Electroproduction of the neutral pion off 4He