CLAS Physics Database

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 φh amplitude has been measured in the distribution of the cross section ratio as a function of the azimuthal angle φh 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
ALUsin φh

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2
Q2max,
GeV2
Wmin,
GeV
Wmax,
GeV
E35M1 ALUsin φh e p semi-inclusive 1.36 3.26 None None