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$$\eta ^{(\prime )}$$-meson twist-2 distribution amplitude within QCD sum rule approach and its application to the semi-leptonic decay $$ D_s^+ \rightarrow \eta ^{(\prime )}\ell ^+ \nu _\ell $$

Crossref DOI link: https://doi.org/10.1140/epjc/s10052-021-09958-0

Published Online: 2022-01-07

Published Print: 2022-01

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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