Document Type

Article

Publication Date

2008

DOI

10.1103/PhysRevC.77.042201

Publication Title

Physical Review C

Volume

77

Issue

4

Pages

042201

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 sinϕ 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 nonzero 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.

Comments

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Original Publication Citation

Collaboration, C., Masi, R. D., Garçon, M., Zhao, B., Amaryan, M. J., Ambrozewicz, P., . . . Zhao, Z. W. (2008). Measurement of ep→epπᵒ beam spin asymmetries above the resonance region. Physical Review C, 77(4), 042201. doi:10.1103/PhysRevC.77.042201

ORCID

0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)

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