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 $h_1^{\perp }(x,k_{\perp })$ convoluted with chiral-odd fragmentation function $\hat{e}(z)$, and the chiral-odd distribution function $e(x)$ convoluted with Collins fragmentation function $H_1^{\perp }(z,k_{\perp }^{\prime })$. We estimate this asymmetry and compare with the experimental measurements from CLAS and HERMES collaborations.

8 pages, 2 PS figures

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• Recent progress in the understanding of single spin asymmetries
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• Transversity in the chiral quark--soliton model and single spin asymmetries
• A leading-twist beam-spin asymmetry in double-hadron inclusive lepto-production
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• Studies of spin-orbit correlations at JLAB
• Double-spin asymmetry $A_{LT}^{\cos {\varphi }_S}$ in semi-inclusive DIS at CLAS12 and EIC within the collinear framework
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• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD