Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-20
Phys.Rev.Lett.107:062001,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 2 figures, minor changes, final version, to be published in PRL
Scientific paper
10.1103/PhysRevLett.107.062001
We consider photon pair production in hadronic collisions at large mass and small transverse momentum of the pair, assuming that factorization in terms of transverse momentum dependent parton distributions applies. The unpolarized cross section is found to have azimuthal angular dependencies that are generated by a gluonic version of the Boer-Mulders function. In addition, the single-transversely polarized cross section is sensitive to the gluon Sivers function. We present simple numerical estimates for the Boer-Mulders and Sivers effects in diphoton production at RHIC and find that the process would offer unique opportunities for exploring transverse momentum dependent gluon distributions.
Qiu Jianwei
Schlegel Marc
Vogelsang Werner
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