Abstract
Measurements of beam‐spin asymmetries from semi‐inclusive pion electro‐production in deep inelastic scattering (DIS) have been performed. Data were taken with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 5.7 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (π+, π0 and π−) were measured simultaneously over a large range of kinematics at the intermediate Q2 range (Q2≈1–3 GeV2). We present our preliminary studies of single‐spin azimuthal asymmetries of the two charged pion channels as functions of z and PT. This new high statistical data will provide important means of studying physics underlying the spin structure of the nucleon.
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