Title

Precise measurements of beam spin asymmetries in semi-inclusive pi(0) production

Document Type

Article

Department/Program

Physics

Journal Title

Physics Letters B

Pub Date

2011

Volume

704

Issue

5

First Page

397

Abstract

We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial sin phi(h) amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle phi(h) of the produced neutral pion. The dependence of this amplitude on Bjorken x and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations. (C) 2011 Elsevier B.V. All rights reserved.

DOI

10.1016/j.physletb.2011.09.044

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