Single spin asymmetries of forward neutron production in polarized and +A collisions at = 200 GeV

谷田 聖; PHENIX Collaboration*

Proceedings of Science (Internet), 265, p.211_1 - 211_5, 2016/11

https://doi.org/10.22323/1.265.0211

In high-energy hadron collisions, most energy goes to the forward region. However, particle production mechanisms in the forward region are not well understood as perturbative QCD is not applicable at small momentum transfers. We study single spin asymmetries () of forward neutron production in the PHENIX experiment using a transversely polarized proton beam. In 2015, we took data for + A collisions for the first time with Au and Al beams at = 200 GeV and observed a surprising A dependence. The results are presented together with discussions on possible mechanisms that could explain them.