Year: 2014
Type: article
Abstract: A rainbow-ladder truncation of QCD's Dyson-Schwinger equations is used to calculate $\ensuremath{\rho}$- and $\ensuremath{\phi}$-meson valence-quark (twist-two parton) distribution amplitudes (PDAs) via a light-front projection of their Bethe-Salpeter wave functions, which possess $S$- and $D$-wave components of comparable size in the meson rest frame. All computed PDAs are broad concave functions, whose dilation with respect to the asymptotic distribution is an expression of dynamical chiral symmetry breaking. The PDAs can be used to define an ordering of valence-quark light-front spatial extent within mesons: this size is smallest within the pion and increases through the $\ensuremath{\perp}$ polarization to the $\ensuremath{\parallel}$ polarization of the vector mesons; effects associated with the breaking of SU(3)-flavor symmetry are significantly smaller than those associated with altering the polarization of vector mesons. Notably, the predicted pointwise behavior of the $\ensuremath{\rho}$-meson PDAs is in quantitative agreement with that inferred recently via an analysis of diffractive vector-meson photoproduction experiments.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G102163711, G3231345139, 高温高密强相互作用物质性质的研究
OpenAlex ID: W2170675882