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Preprint PUBDB-2021-04682
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Measurement of Differential Branching Fractions of Inclusive ${B \to X_u \, \ell^+\, \nu_{\ell}}$ Decays

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2021

[10.3204/PUBDB-2021-04682]  GO

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Report No.: Belle Preprint 2021-15; KEK Preprint 2021-13; arXiv:2107.13855

Abstract: The first measurements of differential branching fractions of inclusive semileptonic ${B \to X_u \, \ell^+\, \nu_{\ell}}$ decays are performed using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $\Upsilon(4S)$ resonance and for $\ell = e, \mu$. Differential branching fractions are reported as a function of the lepton momentum, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B \to X_c \, \ell^+\, \nu_{\ell}}$ decays and other processes, and corrected for resolution and acceptance effects. The measured distributions are compared to predictions from inclusive and hybrid ${B \to X_u \, \ell^+\, \nu_{\ell}}$ calculations.

Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; B: semileptonic decay ; mass: hadronic ; lepton: momentum ; B: branching ratio: measured ; momentum dependence ; Upsilon(10570): electroproduction ; positron ; muon ; BELLE ; KEK-B ; acceptance ; hybrid ; background ; light cone ; resolution ; experimental results ; B --> positron neutrino/e anything ; B --> muon+ neutrino/mu anything


Note: 20 pages, 9 captioned figures, plus supplemental material. Submitted to Phys. Rev. Lett 29.07.2021
Contributing Institute(s):
  1. BELLE II Experiment (BELLE)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
Experiment(s):
  1. KEK: BELLE I/II

Appears in the scientific report 2021
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Creative Commons Attribution CC BY 4.0 ; OpenAccess ; Published
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article  ;  ;  ; et al
Measurement of Differential Branching Fractions of Inclusive ${B \to X_u \, \ell^+\, \nu_{\ell}}$ Decays
Physical review letters 127(26), 261801 () [10.1103/PhysRevLett.127.261801]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

 Record created 2021-11-18, last modified 2023-02-14
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