Double-spin asymmetry $A_{LT}$ in open charm production

Koichi Kanazawa; Shinsuke Yoshida; Yoshitaka Hatta

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Double-spin asymmetry $A_{LT}$ in open charm production

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arxiv 1305.7001 v2 pith:3EADZWYN submitted 2013-05-30 hep-ph

Yoshitaka Hatta , Koichi Kanazawa , Shinsuke Yoshida This is my paper

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keywords asymmetrycharmopenproductionallowsamplitudeanalysisapproach

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In the collinear twist-three approach, we calculate for the first time the gluon contribution to double (longitudinal-transverse) spin asymmetry A_{LT} for open charm production in proton-proton collisions measurable at RHIC. Utilizing the Ward-Takahashi identity for the non-pole part of the hard scattering amplitude, we derive a factorized, gauge invariant formula for the asymmetry. The result may be combined with the previous studies of single-spin asymmetry in the same channel and allows for a systematic analysis of three-gluon correlations inside a transversely polarized nucleon.

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