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Report No.

Transverse single-spin asymmetry for very forward neutral pion production in polarized $$p+p$$ collisions at $$sqrt{s}$$ = 510 GeV

Kim, M. H.*; Tanida, Kiyoshi; RHICf Collaboration*; 23 of others*

Transverse single-spin asymmetries of very forward neutral pions generated in polarized $$p + p$$ collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized $$p$$+$$p$$ collisions at $$sqrt{s}$$ = 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction $$x_{F}$$ and transverse momentum $$p_{T}$$ have been observed at low transverse momentum $$p_{T} < 1$$ GeV/$$c$$ for the first time at this collision energy. The asymmetries show an approximate $$x_{F}$$ scaling in the $$p_{T}$$ region where non-perturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.



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Category:Physics, Multidisciplinary



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