Probing the Sivers function with an unpolarized target: GTMD distributions and the Odderons

Abstract

It is commonly believed that the Sivers function has uniquely to do with processes involving a transversely polarized nucleon. In this paper we show that it is not necessarily the case. We demonstrate that exclusive pion production in $un$polarized electron-proton scattering in the forward region is a direct probe of the gluon Sivers function due to its connection to the QCD Odderon.

arXiv comment6 pages, 1 figure

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• Small-x Evolution of the Gluon Generalized Parton Distribution Eg of the Nucleon
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