The spin-dependent BFKL Pomeron generates proton-helicity-flip amplitudes in exclusive quarkonium photoproduction at order momentum transfer squared, with explicit eikonal expressions and quark-model estimates.
Probing the Sivers function with an unpolarized target: GTMD distributions and the Odderons
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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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Off forward non-SCHC contributions to exclusive vector quarkonium production from the "spin dependent BFKL Pomeron"
The spin-dependent BFKL Pomeron generates proton-helicity-flip amplitudes in exclusive quarkonium photoproduction at order momentum transfer squared, with explicit eikonal expressions and quark-model estimates.