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- W1920157966 endingPage "10" @default.
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- W1920157966 abstract "We review what is currently known about the gluon Sivers distribution and what are the opportunities to learn more about it. Because single transverse spin asymmetries in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:msup><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>↑</mml:mo></mml:mrow></mml:msup><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>π</mml:mi><mml:mi>X</mml:mi></mml:math>provide only indirect information about the gluon Sivers function through the relation with the quark-gluon and tri-gluon Qiu-Sterman functions, current data from hadronic collisions at RHIC have not yet been translated into a solid constraint on the gluon Sivers function. SIDIS data, including the COMPASS deuteron data, allow for a gluon Sivers contribution of natural size expected from large<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>arguments, which is<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mi mathvariant=script>O</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:mn mathvariant=normal>1</mml:mn><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub><mml:mo stretchy=false>)</mml:mo></mml:math>times the nonsinglet quark Sivers contribution. Several very promising processes to measure the gluon Sivers effect directly have been suggested, which besides RHIC investigations, would strongly favor experiments at AFTER@LHC and a possible future Electron-Ion Collider. Due to the inherent process dependence of TMDs, the gluon Sivers TMD probed in the various processes are different linear combinations of two universal gluon Sivers functions that have different behavior under charge conjugation and that therefore satisfy different theoretical constraints. For this reason both hadronic and DIS type of collisions are essential in the study of the role of gluons in transversely polarized protons." @default.
- W1920157966 created "2016-06-24" @default.
- W1920157966 creator A5012793166 @default.
- W1920157966 creator A5039726094 @default.
- W1920157966 creator A5041028503 @default.
- W1920157966 creator A5083642525 @default.
- W1920157966 date "2015-01-01" @default.
- W1920157966 modified "2023-10-16" @default.
- W1920157966 title "The Gluon Sivers Distribution: Status and Future Prospects" @default.
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