Speaker
Description
Forward neutron single spin asymmetries in proton-proton collisions have
been discovered in early polarized RHIC running and have since been used
as local polarimetry by the RHIC experiments. Its creation mechanism can
be explained by the interference of pion and a1 exchange between the
polarized proton and the other hadron. However, the PHENIX experiment
discovered that the asymmetries in proton-nucleus collisions change sign
and have a larger magnitude, which can be explained by ultra-peripheral
collisions. To better understand the interplay of the two suggested
mechanisms, the data was analyzed as a function of transverse momentum
and xF and in (anti)correlation with detector activity that is sensitive
to the presence or absence of hard collisions.
The results for proton-proton, proton-Aluminum and proton-Gold
collisions will be presented and compared to model predictions including
both mechanisms.
| Submitted on behalf of a Collaboration? | Yes |
|---|
