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  • Polarization components in ▫$\pi^0$▫ photoproduction at photon energies up to 5.6 GeV
    Luo, W. ...
    We present new data for the polarization observables of the final state proton in the ▫$^1H(\vec{\gamma},\vec{p})\pi^0$▫ reaction. These data can be used to test predictions based on hadron helicity ... conservation and perturbative QCD. These data have both small statistical and systematic uncertainties and were obtained with beam energies between 1.8 and 5.6 GeV and for ▫$\pi^0$▫ scattering angles larger than 75° in the center-of-mass frame. The data extend the polarization measurements database for neutral pion photoproduction up to ▫$E_\gamma=5.6$▫ GeV. The results show a nonzero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and ▫$\pi^0$▫ scattering angle in the center-of-mass frame. This indicates that hadron helicity conservation does not hold and that the perturbative QCD limit is still not reached in theenergy regime of this experiment.
    Vir: Physical review letters. - ISSN 0031-9007 (Vol. 108, iss. 22, 2012, str. 222004-1-222004-6)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 2432100

    Povezava(-e):

    http://link.aps.org/doi/10.1103/PhysRevLett.108.222004

vir: Physical review letters. - ISSN 0031-9007 (Vol. 108, iss. 22, 2012, str. 222004-1-222004-6)
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