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arXiv · 1604.06585

Exploring universality of transversity in proton-proton collisions

Marco Radici·Alessandro M. Ricci·Alessandro Bacchetta·Asmita Mukherjee
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Abstract

We consider the azimuthal correlations of charged hadron pairs with large total transverse momentum and small relative momentum, produced in proton-proton collisions with one transversely polarized proton. One of these correlations directly probes the chiral-odd transversity parton distribution in connection with a chiral-odd interference fragmentation function. We present predictions for this observable based on previous extractions of transversity (from charged pion pair production in semi-inclusive deep-inelastic scattering) and of the interference fragmentation function (from the production of back-to-back charged pion pairs in electron-positron annihilations). All analyses are performed in the framework of collinear factorization. We compare our predictions to the recent data on proton-proton collisions released by the STAR collaboration at RHIC, and we find them reasonably compatible. This comparison confirms for the first time the predicted role of transversity in proton-proton collisions and it allows to test its universality.

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Marco Radici, Alessandro M. Ricci, Alessandro Bacchetta, Asmita Mukherjee. 2016-04-22. Exploring universality of transversity in proton-proton collisions. https://doi.org/10.1103/physrevd.94.034012

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