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Transverse single spin asymmetry for very forward $$pi^0$$ production in polarized proton-proton collisions at $$sqrt s$$ = 510 GeV

$$sqrt s$$=510GeVでの偏極陽子-陽子衝突における超前方$$pi^0$$生成の横スピン非対称性

Kim, M. H.*; 谷田 聖; 他20名*

Kim, M. H.*; Tanida, Kiyoshi; 20 of others*

Transverse single spin asymmetry, $$A_{N}$$, of very forward $$pi^{0}$$ production from polarized $$p + p$$ collisions provides new information toward an understanding of its production mechanism. $$A_{N}$$ of forward $$pi^{0}$$ in the pseudorapidity region of $$3 < eta < 4$$ 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 $$A_{N}$$, we measured the very forward $$pi^{0}$$ production in the pseudorapidity region of $$6 < eta$$ from $$sqrt{s}$$ = 510 GeV polarized $$p + p$$ collisions at RHIC in 2017. We report our measurement of the very forward $$pi^{0}$$ over the transverse momentum range of $$0 < p_{T} < 1$$ GeV/$$c$$ and the preliminary result.

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