Transverse-single-spin asymmetries of charged pions at midrapidity in transversely polarized collisions at GeV

Acharya, U. A.*; Hasegawa, Shoichi   ; Imai, Kenichi*; Sako, Hiroyuki   ; Sato, Susumu  ; Tanida, Kiyoshi   ; PHENIX Collaboration*; 306 of others*

In 2015, the PHENIX collaboration has measured single-spin asymmetries for charged pions in transversely polarized proton-proton collisions at the center of mass energy of GeV. The pions were detected at central rapidities of . 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.