Boussarie R, Hatta Y, Szymanowski L, Wallon S. Probing the Gluon Sivers Function with an Unpolarized Target: GTMD Distributions and the Odderons.
PHYSICAL REVIEW LETTERS 2020;
124:172501. [PMID:
32412297 DOI:
10.1103/physrevlett.124.172501]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 03/26/2020] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
It is commonly believed that the Sivers function has uniquely to do with processes involving a transversely polarized nucleon. In this Letter we show that this is not necessarily the case. We demonstrate that exclusive pion production in unpolarized 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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