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Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at s**(1/2) = 200-GeV

Collaboration
Jan, 2008
6 pages
Published in:
  • Phys.Rev.Lett. 101 (2008) 222001
e-Print:
DOI:
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Abstract: (arXiv)
We report precision measurements of the Feynman-x dependence, and first measurements of the transverse momentum dependence, of transverse single spin asymmetries for the production of \pi^0 mesons from polarized proton collisions at \sqrt{s}=200 GeV. The x_F dependence of the results are in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p_T dependence at fixed x_F are not consistent with pQCD-based calculations.
Note:
  • 6 pages, 4 figures
  • 13.88.+e
  • 13.85.Ni
  • 12.38.Qk
  • p p: colliding beams
  • p: polarized beam
  • pi0: hadroproduction
  • small-angle
  • spin: asymmetry
  • transverse momentum dependence
  • x-dependence
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