e1dvcs run CLAS data

Spokesperson

H. Avakian

Year

2011

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 the Thomas Jefferson National Accelerator Facility, using an unpolarized hydrogen target and the CEBAF Large Acceptance Spectrometer (CLAS). A substantial sin φ_h amplitude has been measured in the distribution of the cross section ratio as a function of the azimuthal angle φ_h of the produced neutral pion. The dependence of this amplitude on Bjorken x and on the pion transverse momentum is extracted and compared with published data and model calculations.

Comment

Beam polarization is 80%.

Publication

1. M. Aghasyan, H. Avakian, P. Rossi, E. De Sanctis, D. Hasch, M. Mirazita and CLAS Collaboration Precise measurements of beam spin asymmetries in semi-inclusive π⁰ production // Phys. Letters B 704, 397 (2011)

Quantities

A_LU^sin φ_h

Measurements