# Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $\pi^0$ production

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.
Document type :
Journal articles

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Submitted on : Tuesday, June 14, 2011 - 1:40:00 PM
Last modification on : Monday, December 13, 2021 - 9:14:51 AM

### Citation

M. Aghasyan, H. Avakian, P. Rossi, E. de Sanctis, D. Hasch, et al.. Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $\pi^0$ production. Physics Letters B, Elsevier, 2011, 704, pp.397-402. ⟨10.1016/j.physletb.2011.09.044⟩. ⟨in2p3-00600257⟩

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