Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B-Meson Decays at Belle II.

Journal

Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141

Informations de publication

Date de publication:
04 Aug 2023
Historique:
received: 25 01 2023
revised: 03 05 2023
accepted: 11 05 2023
medline: 18 8 2023
pubmed: 18 8 2023
entrez: 18 8 2023
Statut: ppublish

Résumé

We present the first measurement of the ratio of branching fractions of inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test of electron-muon universality, using data corresponding to 189  fb^{-1} from electron-positron collisions collected with the Belle II detector. In events where the partner B meson is fully reconstructed, we use fits to the lepton momentum spectra above 1.3  GeV/c to obtain R(X_{e/μ})=1.007±0.009(stat)±0.019(syst), which is the most precise lepton-universality test of its kind and agrees with the standard-model expectation.

Identifiants

DOI: 10.1103/PhysRevLett.131.051804 PMID: 37595249
pubmed: 37595249
doi: 10.1103/PhysRevLett.131.051804
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

051804

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L Aggarwal (L)

H Ahmed (H)

H Aihara (H)

N Akopov (N)

A Aloisio (A)

N Anh Ky (N)

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Classifications MeSH