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Vector mesons leading-twist longitudinal distribution amplitudes and related semi-leptonic decays within QCD sum rules
In this work, we focus on the light vector meson leading-twist longitudinal distribution amplitudes (DAs) $ϕ^\parallel_{2;V}(x,μ)$ with $V = ρ, K^\ast, ϕ$. A new scheme of QCD sum rule research with respect to DA suggested in 2021 by us is adopted. With an improved sum rule formula, the $ξ$-moments
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