Author:
Zhong 钟 Tao 涛,Dai 代 Ya-Hong 亚红,Fu 付 Hai-Bing 海冰
Abstract
Abstract
Motivated by our previous study [Phys. Rev. D 104(1), 016021 (2021)] on the pionic leading-twist distribution amplitude (DA), we revisit the ρ-meson leading-twist longitudinal DA
in this study. A model proposed by Chang based on the Dyson-Schwinger equations is adopted to describe the behavior of
. However, the ξ-moments of
are calculated with the QCD sum rules in the framework of the background field theory. The sum rule formulas for these moments are improved. More accurate values for the first five nonzero ξ-moments at the typical scale
are given, e.g., at
,
,
,
,
, and
. By fitting these values with the least squares method, the DSE model for
is determined. By taking the left-handed current light-cone sum rule approach, we obtain the transition form factor in the large recoil region, i.e.,
,
, and
, and the ratio
,
. After extrapolating with a rapidly converging series based on
-expansion, we present the
-independent decay width for the semileptonic decays
. Finally, the branching fractions are
,
,
, and
.
Funder
National Natural Science Foundation of China
Cited by
2 articles.
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