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- W2969759881 abstract "The leading-twist parton distribution functions of the pion and kaon are calculated for the first time using a rainbow-ladder truncation of QCD's Dyson-Schwinger equations (DSEs) that self-consistently sums all planar diagrams. The non-perturbative gluon dressing of the quarks is thereby correctly accounted for, which in practice means solving the inhomogeneous Bethe-Salpeter equation (BSE) for the quark operator that defines the spin-independent quark distribution functions. An immediate consequence of using this dressed vertex is that gluons carry 35% of the pion's and 30% of the kaon's light-cone momentum, with the remaining momentum carried by the quarks. The scale associated with these DSE results is $mu_0 = 0.78,$GeV. The gluon effects generated by the inhomogeneous BSE are inherently non-perturbative and cannot be mimicked by the perturbative QCD evolution equations. A key consequence of this gluon dressing is that the valence quarks have reduced support at low-to-intermediate $x$, where the gluons dominate, and increased support at large $x$. As a result, our DSE calculation of the pion's valence quark distribution is in excellent agreement with the Conway et al. pion-induced Drell-Yan data, but nevertheless exhibits the $q_pi(x) simeq (1-x)^2$ behavior as $xto 1$ predicted by perturbative QCD." @default.
- W2969759881 created "2019-08-29" @default.
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- W2969759881 date "2018-11-29" @default.
- W2969759881 modified "2023-09-24" @default.
- W2969759881 title "Distinguishing Quark and Gluon Partons in the the Pion and Kaon" @default.
- W2969759881 hasPublicationYear "2018" @default.
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