Pseudoscalar mesons parton distribution amplitudes
نویسندگان
چکیده
منابع مشابه
Transition form factors and light cone distribution amplitudes of pseudoscalar mesons in the chiral quark model
It is shown that a chiral quark model of the Nambu–Jona-Lasinio type can be used to describe ”soft”-momenta parts of the amplitudes with large momentum transfer. As a sample, the processes γ∗ → γ(π, η, η′) where one of the photons, γ∗, has large spacelike virtuality is investigated. The γ∗ → γ(π, η, η′) transition form factors are calculated for a wide region of transferred momenta. The results...
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P.A. Boylea, D. Brömmel∗b, M.A. Donnellanb,c, J.M. Flynnb, A. Jüttnerd and C.T. Sachrajdab a School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JH, UK b School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK c Deutsches Elektronen-Synchrotron DESY, 15738 Zeuthen, Germany d Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Ma...
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η – η mixing is discussed in the quark-flavor basis with the hypothesis that the decay constants follow the pattern of particle state mixing. On exploiting the divergences of the axial vector currents – which embody the axial vector anomaly – all mixing parameters are fixed to first order of flavor symmetry breaking. An alternative set of parameters is obtained from a phenomenological analysis....
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We present the current status of the MILC collaboration’s calculations of the properties of the light pseudoscalar meson sector. We use asqtad staggered ensembles with 2+1 dynamical flavors down to a≈ 0.045 fm and light quark mass down to 0.05ms. Here we describe fits to the data using chiral forms from SU(3) chiral perturbation theory, including all staggered taste violations at NLO and the co...
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Parton distributions of pseudoscalar π,K and η mesons obtained within the NJL model using the Pauli-Villars regularization method are analyzed in terms of LO and NLO evolution, and the valence sea quark and gluon parton distributions for the pion are obtained at Q2 = 4GeV and compared to existing parametrizations at that scale. Surprisingly, the NLO order effects turn out to be small compared t...
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ژورنال
عنوان ژورنال: EPJ Web of Conferences
سال: 2016
ISSN: 2100-014X
DOI: 10.1051/epjconf/201611305013