Transverse momentum dependent forward neutron single spin asymmetries in transversely polarized $p+p$ collisions at $\sqrt{s}=200$ GeV

The PHENIX collaboration
Acharya, U.A. , Aidala, C. , Akiba, Y. , Alfred, M. , Andrieux, V. , Apadula, N. , Asano, H. , Azmoun, B. , Babintsev, V. , Bandara, N.S.
Phys.Rev.D 103 (2021) 032007, 2021.

Abstract (data abstract)
BNL-RHIC. In 2015, the PHENIX collaboration has measured very forward ($\eta > 6.8$) single spin asymmetries of inclusive neutrons in transversely polarized proton-proton and proton-nucleus collisions at a center of mass energy of 200 GeV. A previous publication from this data set concentrated on the nuclear dependence of such asymmetries. In this measurement the explicit transverse momentum dependence of inclusive neutron single spin asymmetries for proton-proton collisions is extracted using a bootstrapping unfolding technique on the transverse momenta. This explicit transverse momentum dependence will help improve the understanding of the mechanisms that create these asymmetries.

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