EPJ Web of Conferences (Jan 2019)

Transverse single spin asymmetry for very forward π0 production in polarized proton-proton collisions at √s = 510 GeV

  • Kim M. H.,
  • Hong B.,
  • Goto Y.,
  • Nakagawa I.,
  • Seidl R.,
  • Park J. S.,
  • Tanida K.,
  • Itow Y.,
  • Menjo H.,
  • Sato K.,
  • Ueno M.,
  • Zhou Q. D.,
  • Sako T.,
  • Kasahara K.,
  • Suzuki T.,
  • Torii S.,
  • Sakurai N.,
  • Adriani O.,
  • Bonechi L.,
  • Berti E.,
  • D'Alessandro R.,
  • Tricomi A.

DOI
https://doi.org/10.1051/epjconf/201920805007
Journal volume & issue
Vol. 208
p. 05007

Abstract

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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.