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

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arxiv 1912.08182 v1 pith:IPPNTCLP submitted 2019-12-17 hep-ph hep-exnucl-exnucl-th

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

Renaud Boussarie , Yoshitaka Hatta , Lech Szymanowski , Samuel Wallon This is my paper
classification hep-ph hep-exnucl-exnucl-th
keywords functionsiverspolarizedbelievedcasecommonlyconnectiondemonstrate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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  1. Gluon GTMDs in the exclusive electroproduction of heavy-quark pairs

    hep-ph 2026-07 accept novelty 6.0

    Exclusive heavy-quark pair electroproduction is expressed through gluon GTMDs, with all azimuthal modulations catalogued and shown to reduce consistently to GPD-based formulas in the collinear limit.