Double spin asymmetry A_{LT} in direct photon production [PDF]
Zuo-Tang Liang, Andreas Metz, Daniel Pitonyak, Andreas Schäfer, Yu-Kun Song, Jian ZhouWe study the longitudinal-transverse double spin asymmetry $A_{LT}$ for direct photon production in nucleon-nucleon scattering by using the collinear twist-3 approach. This asymmetry, which, for instance, could be measured at RHIC, contains a complete set of collinear twist-3 correlation functions in a transversely polarized nucleon.View original: http://arxiv.org/abs/1203.3956
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