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Determination of |𝑉𝑢⁢𝑏| from simultaneous measurements of untagged 𝐵⁰→𝜋⁻⁢ℓ⁺⁢𝜈ℓ and 𝐵⁺ →𝜌⁰⁢ℓ⁺⁢𝜈ℓ decays

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dc.contributor.authorAdachi, I.
dc.contributor.authorAggarwal, L.
dc.contributor.authorAihara, H.
dc.contributor.authorAkopov, N.
dc.contributor.authorAloisio, A.
dc.contributor.authorAlthubiti, N.
dc.contributor.authorAnh Ky, N.
dc.contributor.authorAsner, D.M.
dc.contributor.authorAtmacan, H.
dc.contributor.authorAushev, T.
dc.contributor.authorAushev, V.
dc.contributor.authorAversano, M.
dc.contributor.authorAyad, R.
dc.contributor.authorBabu, V.
dc.contributor.authorBae, H.
dc.contributor.authorBahinipati, S.
dc.contributor.authorBambade, P.
dc.contributor.authorBanerjee, S.
dc.contributor.authorBansal, S.
dc.contributor.authorBarrett, M.
dc.contributor.authoret al.
dc.date.issued2025
dc.description.abstractWe present a measurement of |𝑉𝑢⁢𝑏| from a simultaneous study of the charmless semileptonic decays 𝐵⁰→𝜋⁻⁢ℓ⁺⁢𝜈ℓ and 𝐵⁺→𝜌⁰⁢ℓ⁺⁢𝜈ℓ, where ℓ =𝑒, 𝜇. This measurement uses a data sample of 387 million 𝐵⁢¯𝐵 meson pairs recorded by the Belle II detector at the SuperKEKB electron-positron collider between 2019 and 2022. The two decays are reconstructed without identifying the partner 𝐵 mesons. We simultaneously measure the differential branching fractions of 𝐵⁰ →𝜋⁻⁢ℓ⁺⁢𝜈ℓ and 𝐵⁺ →𝜌⁰⁢ℓ⁺⁢𝜈ℓ decays as functions of 𝑞² (momentum transfer squared). From these, we obtain total branching fractions ℬ⁡(𝐵⁰→𝜋⁻⁢ℓ⁺𝜈ℓ) = (1.516 ± 0.042⁢(stat) ± 0.059⁢(syst)) ×10⁻⁴ and ℬ⁡(𝐵⁺→𝜌⁰⁢ℓ⁺⁢𝜈ℓ) = (1.625 ± 0.079⁢(stat) ± 0.180⁢(syst)) ×10⁻⁴. By fitting the measured 𝐵⁰ →𝜋⁻⁢ℓ⁺⁢𝜈ℓ partial branching fractions as functions of 𝑞², together with constraints on the nonperturbative hadronic contribution from lattice QCD calculations, we obtain |𝑉𝑢⁢𝑏| =(3.93 ± 0.09 ± 0.13 ± 0.19) × 10⁻³. Here, the first uncertainty is statistical, the second is systematic, and the third is theoretical.
dc.description.statementofresponsibilityBelle II Collaboration
dc.identifier.citationPhysical Review D, 2025; 111(11):112009-1-112009-20
dc.identifier.doi10.1103/jnwn-ts6q
dc.identifier.issn2470-0010
dc.identifier.issn2470-0029
dc.identifier.orcidDe La Motte, S.A. [0000-0003-3905-6805]
dc.identifier.orcidHarris, C. [0000-0003-0448-4244]
dc.identifier.orcidJackson, P. [0000-0002-0847-402X]
dc.identifier.urihttps://hdl.handle.net/2440/148106
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101792
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101792
dc.relation.granthttp://purl.org/au-research/grants/arc/DP210102831
dc.relation.granthttp://purl.org/au-research/grants/arc/DE220100462
dc.relation.granthttp://purl.org/au-research/grants/arc/LE210100098
dc.relation.granthttp://purl.org/au-research/grants/arc/LE230100085
dc.rightsPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3
dc.source.urihttps://doi.org/10.1103/jnwn-ts6q
dc.subjectCabibbo–Kobayashi–Maskawa matrix; Form factors; Leptonic, semileptonic & radiative decays
dc.titleDetermination of |𝑉𝑢⁢𝑏| from simultaneous measurements of untagged 𝐵⁰→𝜋⁻⁢ℓ⁺⁢𝜈ℓ and 𝐵⁺ →𝜌⁰⁢ℓ⁺⁢𝜈ℓ decays
dc.title.alternativeDetermination of |Vub)| from simultaneous measurements of untagged 𝐵0 -> pi-⁢ℓ+⁢vℓ and B+ -> p0⁢ℓ+⁢𝜈ℓ decays
dc.typeJournal article
pubs.publication-statusPublished

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