In 2015, the PHENIX Collaboration has measured single-spin asymmetries for charged pions in transversely polarized $p+p$ collisions at the center-of-mass energy of $\sqrt{s}=200\mathrm{GeV}$. The pions were detected at central rapidities of $|\eta |<0.35$. The single-spin asymmetries are consistent with zero for each charge individually, as well as consistent with the previously published neutral-pion asymmetries in the same rapidity range. However, they show a slight indication of charge-dependent differences which may suggest a flavor dependence in the underlying mechanisms that create these asymmetries.

• Received 12 December 2021
• Accepted 7 January 2022

DOI:https://doi.org/10.1103/PhysRevD.105.032003

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Published by the American Physical Society