Beam-Spin Azimuthal Asymmetries in Pion Electroproduction at HERMES · arXivDesk
hep-ex/0408002Aug 1, 2004To appear in the proceedings of the 12th International Workshop on Deep Inelastic Scattering and QCD, Strbske Pleso, High Tatras, Slovakia, Apr 14 - 18, 2004
Beam-Spin Azimuthal Asymmetries in Pion Electroproduction at HERMES
We present the measurement of Single Beam-Spin Azimuthal Asymmetries in pion electroproduction off hydrogen in semi-inclusive deep inelastic scattering (SIDIS). The measurement was made using the HERMES spectrometer with an internal gas target and the polarized 27.6 GeV electron(positron) beam of HERA using the data taken during the years 1996-2000. The sinφ modulation of the azimuthal asymmetry was measured for semi-inclusive π+,π− and π0
Nearby in the stack
. The dependence of the asymmetry on the Bjorken
x
, pion relative (
z
) and transverse (
PT
) momentum is presented. Results are compared to theoretical model calculation.
H targets at 27.5 GeV beam energy
The HERMES Collaboration, A. Airapetian, N. Akopov +97