Precise measurements of beam spin asymmetries in semi-inclusive pi(0) production
Physics Letters B
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.
Aghasyan, M.; Rossi, P.; De Sanctis, E.; Griffioen, K. A.; Jawalkar, S. S.; and Zhao, B., Precise measurements of beam spin asymmetries in semi-inclusive pi(0) production (2011). Physics Letters B, 704(5), 397-402.