München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.2: Talk
Monday, March 18, 2019, 17:00–17:15, HS 13
SIDIS Pion Beam Spin Asymmetries measured with CLAS 12 at 10.6 GeV — •Stefan Diehl for the CLAS collaboration — University of Connecticut, Storrs, USA — Justus Liebig University Giessen, Giessen, Germany
The CLAS12 detector at Jefferson Laboratory (JLab) started data taking with a polarized 10.6 GeV electron beam in February 2018. One of the first quantities which could be extracted from the new data is the moment Asin(φ)LU corresponding to the polarized electron beam spin asymmetry in semi-inclusive deep inelastic scattering. Asin(φ)LU is a twist-3 quantity which provides information about the quark gluon correlations. The study was performed with a 10.6 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. The talk will present a simultaneous study of all three pion channels (π+, π0 and π−) over a large kinematic range with virtualities Q2 ranging from 1 GeV2 up to 8 GeV2. The measurement in a large range of z, xB, PT and Q2, including up to now not measured kinematic regions, enables a comparison with different reaction models.
*The work is supported by DOE grant no: DE-FG02-04ER41309.