Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-18
Phys.Rev.D78:114013,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 7 figures
Scientific paper
10.1103/PhysRevD.78.114013
We calculate the single transverse-spin asymmetry for open charm production in $pp$ collisions within the QCD collinear factorization approach. We include contributions from both twist-three quark-gluon and tri-gluon correlation functions. We find that the quark-gluon correlation functions alone generate only a very small asymmetry for open charm production in the kinematic region of current interest at RHIC, so that the observation of any significant single-spin asymmetry would be a clear indication of the presence of tri-gluon correlations inside a polarized proton. We furthermore demonstrate that the tri-gluon contribution could be very different for the production of $D$ and $\bar{D}$ mesons. These features make the single spin asymmetry in open charm production in polarized $pp$ collisions at RHIC an excellent probe of tri-gluon correlation functions.
Kang Zhong-Bo
Qiu Jian-Wei
Vogelsang Werner
Yuan Fang-Fang
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