منابع مشابه
Measurement of the gluon polarization ∆G/G at COMPASS
One of the key objectives of the COMPASS experiment at CERN is the determination of the gluon contribution to the nucleon spin. The gluon polarization is measured via photon-gluon fusion in deep-inelastic scattering of 160 GeV/c polarized muons on a polarized LiD solid-state target. Photon-gluon fusion is tagged by the observation of charmed mesons or the production of hadron pairs with large t...
متن کاملand gluon polarization †
In exclusive J/ψ production by polarized photons incident on polarized protons , a finite polarization asymmetry arises because of c¯ c Fermi-motion and binding-energy effects. The asymmetry depends on the polarized nonfor-ward gluon distribution of the proton and thus gives information on gluon polarization in the proton. The analyzing power, however, is rather small. Gluon polarization in the...
متن کاملGluon Polarization from QCD Sum Rules
The gluon polarization ∆G in a nucleon can be defined in a gauge invariant way as the integral over the Ioffe-time distribution of polarized gluons. We argue that for sufficiently regular polarized gluon distributions ∆G is dominated by contributions from small and moderate values of the Ioffe-time z ∼ 10. As a consequence ∆G can be estimated with 20% accuracy from the first two even moments of...
متن کاملExclusive J/ψ photoproduction and gluon polarization
In exclusive J/ψ production by polarized photons incident on polarized protons , a finite polarization asymmetry arises because of c¯ c Fermi-motion and binding-energy effects. The asymmetry depends on the polarized nonfor-ward gluon distribution of the proton and thus gives information on gluon polarization in the proton. The analyzing power, however, is rather small. Gluon polarization in the...
متن کاملGluon Polarization in e + e − → tt̄G
We calculate the linear and circular polarization of gluons radiated off top quarks produced in e + e −-annihilations. For typical top pair production energies at the Next-Linear-Collider (NLC) the degree of linear polarization remains close to its soft gluon value of 100% over almost the whole energy spectrum of the gluon. The circular polarization is largest for maximal gluon energies where t...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.56.6031