Abstract
Transverse single spin asymmetry, AN, of very forward π0 production from polarized p + p collisions provides new information toward an understanding of its production mechanism. AN of forward π0 in the pseudorapidity region of 3 < η < 4 has been described by the partonic structure of the proton in the perturbative QCD framework. However, recent data indicates a potential contribution from not only partonic but also diffractive interactions. In order to provide a new insight on the origin of the AN, we measured the very forward π0 production in the pseudorapidity region of 6 < η from √s = 510 GeV polarized p + p collisions at RHIC in 2017. We report our measurement of the very forward π0 over the transverse momentum range of 0 < pT < 1 GeV/c and the preliminary result.
Highlights
IntroductionAN is defined as a left-right asymmetry of the production cross section to beam polarization
A new experiment, RHIC forward [1] (RHICf), has measured the transverse single spin√asymmetry, AN, of very forward particle production in s = 510 GeV polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC) in June, 2017
AN is defined as a left-right asymmetry of the production cross section to beam polarization
Summary
AN is defined as a left-right asymmetry of the production cross section to beam polarization It plays an important role in the study of the production mechanism, from the view points of diffractive and non-diffractive interactions. Larger AN was observed with more isolated π0 production and it decreased when the event complexity increased which was more hard scattering-like event topology This result shows an agreement with the preliminary observations from the AN DY collaboration [13], which showed very small magnitude of AN for the inclusive jet production. The RHICf experiment can study the production mechanism of the π0 production by measuring the very forward (6 < η) π0 in wide transverse-momentum coverage (0 < pT < 1 GeV/c) where the diffractive process events are enhanced.
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