Beam spin asymmetry in deep and exclusive pi0 electroproduction

Details Beam spin asymmetry in deep and exclusive pi0 electroproduction Beam spin asymmetry in deep and exclusive pi0 electroproduction

2007-11-29

arxiv.org/abs/0711.4736v2

Phys.Rev.C77:042201,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 6 figures

Scientific paper

10.1103/PhysRevC.77.042201

The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) 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.

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