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Forward Neutral-Pion Transverse Single-Spin Asymmetries in p plus p Collisions at s=200 GeV

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    0322604 - ÚJF 2009 RIV US eng J - Journal Article
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    Forward Neutral-Pion Transverse Single-Spin Asymmetries in p plus p Collisions at s=200 GeV.
    [Asymetrie mezi příčnou hybností dopředných neutrálních pionů a jedním spinem ve srážkách p+p při s=200 GeV.]
    Physical Review Letters. Roč. 101, č. 22 (2008), 222001/1-222001/6. ISSN 0031-9007. E-ISSN 1079-7114
    Institutional research plan: CEZ:AV0Z10480505
    Keywords : POLARIZED PROTON-BEAM * HIGH CHI-F * ANALYZING-POWER
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    Impact factor: 7.180, year: 2008

    We report precision measurements of the Feynman x (x(F)) dependence, and first measurements of the transverse momentum (p(T)) dependence, of transverse single-spin asymmetries for the production of pi(0) mesons from polarized proton collisions at s=200 GeV. The x(F) dependence of the results is 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 these same perturbative QCD-based calculations.

    Předkládáme přesné měření příčné asymetrie jednoho spinu v závislosti na Feynmanovu x a první měření v závislosti na příčné hybnosti pro produkci mezonů pi(0) ve srážkách polarizovaných protonů při s=200 GeV. Závislost na x, na rozdíl od závislosti na příčné hybnosti při daném x, je ve shodě s předpovědí modelu poruchové QCD.
    Permanent Link: http://hdl.handle.net/11104/0170806

     
     
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