Počet záznamů: 1

Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W(+/-) Boson Production in Polarized Proton-Proton Collisions at root s=500 GeV

  1. 1.
    0366157 - UJF-V 2012 RIV US eng J - Článek v odborném periodiku
    Aggarwal, M. M. - Ahammed, Z. - Alekseev, I. - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Kapitán, Jan - Šumbera, Michal - Tlustý, David
    Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W(+/-) Boson Production in Polarized Proton-Proton Collisions at root s=500 GeV.
    Physical Review Letters. Roč. 106, č. 6 (2011), 062002/1-062002/5 ISSN 0031-9007
    Grant CEP: GA MŠk LA09013
    Výzkumný záměr: CEZ:AV0Z10480505
    Klíčová slova: DISTRIBUTIONS * PHYSICS
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 7.370, rok: 2011

    We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W(+) and W(-) boson production in longitudinally polarized proton-proton collisions at root s = 500 GeV by the STAR experiment at RHIC. The measured asymmetries, A(L)(W+) = -0.27 +/- 0.10(stat.) +/- 0.02(syst.) +/- 0.03(norm.) and A(L)(W-) = 0.14 +/- 0.19(stat.) +/- 0.02(syst.) +/- 0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.
    Trvalý link: http://hdl.handle.net/11104/0201231