Abstract
We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in the production of positively charged hadrons in polarized , , and collisions at . The measurements have been performed at forward rapidity () over the range of transverse momentum () and Feynman (). We observed positive asymmetries for positively charged hadrons in collisions, and significantly reduced asymmetries in collisions. These results reveal a nuclear dependence of TSSAs for charged-hadron production in a regime where perturbative techniques are applicable. These results provide new opportunities to use collisions as a tool to investigate the rich phenomena behind TSSAs in hadronic collisions and to use TSSAs as a new handle in studying small-system collisions.
- Received 18 March 2019
- Revised 2 July 2019
DOI:https://doi.org/10.1103/PhysRevLett.123.122001
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Published by the American Physical Society