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Longitudinal double-spin asymmetry for inclusive jet production in (p)over-right-arrow + (p)over-right-arrow collisions at root s=200 GeV

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    0315907 - ÚJF 2009 RIV US eng J - Journal Article
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    Longitudinal double-spin asymmetry for inclusive jet production in (p)over-right-arrow + (p)over-right-arrow collisions at root s=200 GeV.
    [Podélná dvoučásticová spinová asymetrie pro inkluzivní produkci ve srážkách /vec{p} + /vec{p} při (sNN) = 200 GeV].]
    Physical Review Letters. Roč. 100, č. 23 (2008), 232003/1-232003/7. ISSN 0031-9007. E-ISSN 1079-7114
    R&D Projects: GA ČR GA202/07/0079
    Institutional research plan: CEZ:AV0Z10480505
    Keywords : polarized protons * nucleon * photoproduction
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    Impact factor: 7.180, year: 2008

    We report a new STAR measurement of the longitudinal double-spin asymmetry A(LL) for inclusive jet production at midrapidity in polarized p+p collisions at a center-of-mass energy of root s = 200 GeV. The data, which cover jet transverse momenta 5 < p(T) < 30 GeV/c, are substantially more precise than previous measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements.

    Sdělujeme nové STAR měření podélné dvojité spinové asymetrie ALL pro inkluzivní produkci jetů v centrální oblasti rapidit ve srážkách polarizovaných protonů při (sNN) =200 GeV. Údaje pokrývají oblast příčných hybností 5 < pT < 50 GeV/c a jsou podstatně přesnější než předchozí měření. Údaje poukazují na nové omezující podmínky pro příspěvky spinu gluonu do spinu nukleonu porovnáním s předpověďmi odvozenými z jednoho globálního fitu měření polarizovaného hlubokého nepružného rozptylu.
    Permanent Link: http://hdl.handle.net/11104/0165987

     
     
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