Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $π^0$ production

Details Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $π^0$ production Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $π^0$ production

2011-06-12

arxiv.org/abs/1106.2293v2

Phys.Lett.B704:397-402,2011

Physics

High Energy Physics

High Energy Physics - Experiment

to be submitted PLB

Scientific paper

10.1016/j.physletb.2011.09.044

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.

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