158 research outputs found
A phenomenological study of single transverse-spin asymmetry for inclusive light-hadron productions at RHIC
We study the single transverse-spin asymmetry for inclusive light-hadron
productions in the proton-proton collision, \pphx (), for the
RHIC kinematics based on the twist-3 mechanism in the collinear factorization.
The analysis includes all the contributions from the soft-gluon pole and the
soft-fermion pole for the twist-3 quark-gluon correlation functions in the
transversely polarized proton. After discussing the flavor decomposition and
the -dependence of the asymmetry obtained in the previous analysis at the
center-of-mass energy and 200 GeV, we will give a prediction
for the asymmetry at GeV and also for the -meson
production. We found slightly smaller asymmetry at GeV for
and compared with those at the lower energies. The
asymmetry for the -meson turned out to be significantly larger than that
for .Comment: 12 pages, 8 figures, Final version published in Phys. Rev. D 83,
114024 (2011
Single Transverse Spin Asymmetry in and
Single transverse spin asymmetry for the pion production in pp and ep
collisions is studied in the framework of collinear factorization. The
soft-gluon pole contributions with twist-3 distribution and fragmentation
functions are identified and its characteristic features are discussed.Comment: 4 pages in LaTex. Talk presented at PANIC2002, Sep. 30 - Oct. 4,
2002, Osaka, Japa
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