Exclusive $$|V_{ub}|$$ determinations using Padé Approximants
We determine the CKM parameter |Vub| from the exclusive semileptonic decays B→πℓνℓ and Bs→Kℓνℓ, employing Lattice QCD theoretical information on the form factors in combination with experimental measurements of the differential branching ratio distributions. Using Pad\'{e} approximants to the participating form factors we obtain |Vub|=3.86(11)x10-3 and |Vub|=3.58(9)x10-3 from the analyses of the individual decay channels, respectively, and |Vub|=3.68(5)x10-3 from a simultaneous analysis of both decays. Our results highlight the importance of the decay Bs→Kμνμ in complementing the traditional B→πℓνℓ one in the exclusive determination of |Vub| , and strengthens the case for precise measurements of the differential Bs→Kℓνℓ decay rate with a finer resolution of the q2 bins, as it would definitely allow achieving more conclusive results for |Vub| .
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1960176
- Report Number(s):
- LA-UR-22-22737; TRN: US2312945
- Journal Information:
- PoS - Proceedings of Science, Vol. 411; Conference: 11. International Workshop on the CKM Unitarity Triangle (CKM2021), Melbourne (Australia), 22-26 Nov 2021; ISSN 1824-8039
- Publisher:
- SISSACopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
$B \to \pi \ell \nu$ and $B_s \to K \ell \nu$ form factors and $|V_{ub}|$ from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
$|V_{ub}|$ from $B\to\pi\ell\nu$ decays and (2+1)-flavor lattice QCD