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Transverse-single-spin asymmetries of charged pions at midrapidity in transversely polarized p+p collisions at sqrt(s)=200  GeV

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 s=200 GeV. The pions were detected at central rapidities of |η|<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.

Asymmetry ; charged pions ; midrapidity ; p+p ; 200 GeV ; PHENIX ; RHIC

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