Precise measurements of beam spin asymmetries in semi-inclusive π0 production

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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 amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle 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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Published by Elsevier B.V. under CC License Attribution 4.0 International (CC BY 4.0)

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Physics Letters B

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Aghasyan, M., H. Avakian, P. Rossi, E. De Sanctis, D. Hasch, M. Mirazita, D. Adikaram, Biselli, A. et al. "Precise measurements of beam spin asymmetries in semi-inclusive π0 production." Physics Letters B 704, no. 5 (2011): 397-402. https://doi.org/10.1016/j.physletb.2011.09.044