Form factors and phenomenology of B(s) and D(s) semileptonic decays to η and η′

Melić, Blaženka; Reboud, Méril (2025) Form factors and phenomenology of B(s) and D(s) semileptonic decays to η and η′. Journal of High Energy Physics, 10 . ISSN 1029-8479

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Abstract

Motivated by more precise recent measurements of the B -> eta & ell;nu and D(s) -> eta(')& ell;nu decays, we employ state-of-the-art parametrizations to describe the B(s), D(s) -> eta(') form factors across the full q2 range, fitting them to the latest light-cone sum rule results. Using these results, we compute the branching ratios for all relevant decays and compare them with experimental data, finding good agreement. Additionally, we examine the validity and precision of the extracted eta-eta ' mixing angle in the context of heavy meson decays. By combining our predictions for the B, D, Ds -> eta(') form factors with recent semileptonic decay measurements, we extract the CKM elements |Vub|, Vcs, and Vcd. We also provide tests of the lepton flavour universality in the B, D, Ds -> eta(')& ell;nu decays and present results for the forward-backwards asymmetries in these decays. Our findings indicate that the extracted values are becoming comparable in precision to those obtained from more conventional semileptonic decay analyses.

Item Type:	Article
Uncontrolled Keywords:	Bottom Quarks; CKM Parameters; Hadronic Matrix Elements and Weak Decays; Semi-Leptonic Decays
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Neperturbativni QCD u fizici teških okusa Blaženka Melić IP-2024-05-4427 HRZZ
Depositing User:	Ana Zečević
Date Deposited:	05 May 2026 06:15
URI:	https://fulir.irb.hr:/id/eprint/11886
DOI:	10.1007/jhep10(2025)025

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