The Beam Single Spin Asymmetry in Semi-inclusive Deep Inelastic Scattering
Abstract
We study the beam single spin asymmetry in semi-inclusive hadron production in deep inelastic scattering in at order 1/Q. There are two competing contributions: the leading order transverse momentum dependent parton distribution h1(x,k) convoluted with chiral-odd fragmentation function e(z), and the chiral-odd distribution function e(x) convoluted with Collins fragmentation function H1(z,k'). We estimate this asymmetry and compare with the experimental measurements from CLAS and HERMES collaborations.
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