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Transverse single spin asymmetry, $A_{N}$, of very forward $\pi^{0}$production from polarized $p + p$ collisions provides new information toward anunderstanding of its production mechanism. $A_{N}$ of forward $\pi^{0}$ in thepseudorapidity region of $3 < \eta < 4$ has been described by the partonicstructure of the proton in the perturbative QCD framework. However, recent dataindicates a potential contribution from not only partonic but also diffractiveinteractions. 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 regionof $6 < \eta$ from $\sqrt{s}$ = 510 GeV polarized $p + p$ collisions at RHIC in2017. We report our measurement of the very forward $\pi^{0}$ over thetransverse momentum range of $0 < p_{T} < 1$ GeV/$c$ and the preliminaryresult.

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