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e1-dvcs E06-003

Spokespersons
V. D. Burkert, L. Elouadrhiri, M. Garçon, S. Stepanyan
Year
2007
Abstract
The beam spin asymmetry (BSA) in the exclusive reaction ep → epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xb, Q2, t, and φ dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin φ function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
Publication
  1. R. De Masi, M. Garçon, B. Zhao, and CLAS Collaboration Beam spin asymmetry in deep and exclusive π0 electroproduction // arXiv:0711.4736
Quantities
A

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2 		Q2max,
GeV2 		Wmin,
GeV 		Wmax,
GeV
E25M1 A e p π0p 1.07 1.16 None None
E25M2 A e p π0p 1.14 1.17 None None
E25M3 A e p π0p 1.06 1.17 None None
E25M4 A e p π0p 1.12 1.16 None None
E25M5 A e p π0p 1.14 1.18 None None
E25M6 A e p π0p 1.33 1.37 None None
E25M7 A e p π0p 1.34 1.4 None None
E25M8 A e p π0p 1.23 1.37 None None
E25M9 A e p π0p 1.32 1.36 None None
E25M10 A e p π0p 1.27 1.47 None None
E25M11 A e p π0p 1.53 1.63 None None
E25M12 A e p π0p 1.55 1.59 None None
E25M13 A e p π0p 1.43 1.57 None None
E25M14 A e p π0p 1.51 1.58 None None
E25M15 A e p π0p 1.47 1.61 None None
E25M16 A e p π0p 1.59 1.69 None None
E25M17 A e p π0p 1.64 1.73 None None
E25M18 A e p π0p 1.65 1.76 None None
E25M19 A e p π0p 1.65 1.76 None None
E25M20 A e p π0p 1.64 1.72 None None
E25M21 A e p π0p 1.82 1.98 None None
E25M22 A e p π0p 1.87 2.05 None None
E25M23 A e p π0p 1.87 2.06 None None
E25M24 A e p π0p 1.89 2.0 None None
E25M25 A e p π0p 1.88 2.08 None None
E25M26 A e p π0p 2.1 2.27 None None
E25M27 A e p π0p 2.09 2.38 None None
E25M28 A e p π0p 2.04 2.51 None None
E25M29 A e p π0p 2.06 2.22 None None
E25M30 A e p π0p 2.16 2.28 None None
E25M31 A e p π0p 1.83 1.97 None None
E25M32 A e p π0p 1.9 2.04 None None
E25M33 A e p π0p 1.9 2.11 None None
E25M34 A e p π0p 1.95 2.05 None None
E25M35 A e p π0p 1.99 2.07 None None
E25M36 A e p π0p 2.2 2.23 None None
E25M37 A e p π0p 2.12 2.35 None None
E25M38 A e p π0p 2.25 2.4 None None
E25M39 A e p π0p 2.23 2.42 None None
E25M40 A e p π0p 2.33 2.44 None None
E25M41 A e p π0p 2.42 2.55 None None
E25M42 A e p π0p 2.52 2.71 None None
E25M43 A e p π0p 2.64 2.74 None None
E25M44 A e p π0p 2.63 2.95 None None
E25M45 A e p π0p 2.64 2.99 None None
E25M46 A e p π0p 2.71 2.88 None None
E25M47 A e p π0p 2.87 3.1 None None
E25M48 A e p π0p 3.0 3.18 None None
E25M49 A e p π0p 3.01 3.21 None None
E25M50 A e p π0p 2.93 3.19 None None
E25M51 A e p π0p 2.54 2.74 None None
E25M52 A e p π0p 2.53 2.83 None None
E25M53 A e p π0p 2.66 2.82 None None
E25M54 A e p π0p 2.71 2.82 None None
E25M55 A e p π0p 3.12 3.24 None None
E25M56 A e p π0p 3.21 3.33 None None
E25M57 A e p π0p 3.08 3.4 None None
E25M58 A e p π0p 3.06 3.42 None None
E25M59 A e p π0p 3.48 3.67 None None
E25M60 A e p π0p 3.58 3.81 None None
E25M61 A e p π0p 3.61 4.0 None None
E25M62 A e p π0p 3.55 4.05 None None
Created in SINP MSU, CLAS Collaboration