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Title: Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive π0 production

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 Φh amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle Φh 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.
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Publication Date:
OSTI Identifier:
1026792
Report Number(s):
JLAB-PHY--11-1361; DOE/OR/23177--1736; arXiv:1106.2293
Journal ID: ISSN 0370-2693; TRN: US1105128
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 704; Journal Issue: 5; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; AMPLITUDES; ASYMMETRY; CEBAF ACCELERATOR; CROSS SECTIONS; DISTRIBUTION; ELECTRONS; ELECTROPRODUCTION; HYDROGEN; INCLUSIVE INTERACTIONS; PIONS; PIONS NEUTRAL; POLARIZATION; PRODUCTION; DEEP INELASTIC SCATTERING; SPECTROMETERS; SPIN; TRANSVERSE MOMENTUM