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Double Spin Asymmetries $A {LT}^{\cos\phi S}$ and $A {LT}^{\cos(2\phi h -\phi S)}$ in semi-inclusive DIS by Mao, Wenjuan; Lu, Zhun; Ma, Bo-Qiang; Schmidt, Ivan is a scholarly article available to read on EtoBox.

What is Double Spin Asymmetries $A {LT}^{\cos\phi S}$ and $A {LT}^{\cos(2\phi h -\phi S)}$ in semi-inclusive DIS about?

We investigate the double spin asymmetries of pion production in semi-inclusive deep inelastic scattering with a longitudinal polarized beam off a transversely polarized proton target. Particularly, we consider the $\cos\phi_S$ and $\cos(2\phi_h -\phi_S)$ modulations, which can be interpreted by the convolution of the twist-3 transverse momentum dependent distributions and twist-2 fragmentation functions. Three different origins are taken into account simultaneously for each asymmetry: the $g_T D_1$ term, the $e_T H_1^\perp$ term, and the $e_T^\perp H_1^\perp$ term in the $\cos\phi_S$ asymmetry; and the $g_T^\perp D_1$ term, the $e_T H_1^\perp$ term, and the $e_T^\perp H_1^\perp$ term in the $\cos(2\phi_h -\phi_S)$ asymmetry. We calculate the four twist-3 distributions $g_T(x,\boldsymbol{k}_T^2)$, $g_T^\perp(x,\boldsymbol{k}_T^2)$, $e_T(x,\boldsymbol{k}_T^2)$, and $e_T^\perp(x,\boldsymbol{k}_T^2)$ in a spectator-diquark model including vector diquarks. Then we predict the two corresponding asymmetries for charged and neutral pions at the kinematics of HERMES, JLab, and COMPASS for the first time. The numerical estimates indicate that the two different angular-dependence asymmetries

Author

Mao, Wenjuan; Lu, Zhun; Ma, Bo-Qiang; Schmidt, Ivan

Published

2014

Language

EN