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Impact of Λb→Λcτν measurement on new physics in b→clν transitions


Fedele, Marco; Blanke, Monika; Crivellin, Andreas; Iguro, Syuhei; Kitahara, Teppei; Nierste, Ulrich; Watanabe, Ryoutaro (2023). Impact of Λb→Λcτν measurement on new physics in b→clν transitions. Physical review D, 107(5):055005.

Abstract

Measurements of the branching ratios of B→D(*)τ¯ν/B→D(*)ℓ¯ν and Bc→J/ψτ¯ν/Bc→J/ψℓ¯ν by the BABAR, Belle and LHCb collaborations consistently point towards an abundance of taus compared to channels with light leptons. However, the ratio Λb→Λcτ¯ν/Λb→Λcℓ¯ν shows a relative deficit in taus. In this paper, we critically address whether data still points towards a coherent pattern of deviations, in particular in light of the sum rule relating these decays in a model-independent way. We find that no common new physics explanation of all ratios is possible (within 2σ or 1.5σ, depending on the R(Λc) normalization to light lepton channels). While this inconsistency could be a statistical fluctuation, further measurements are required in order to converge to a coherent pattern of experimental results.

Abstract

Measurements of the branching ratios of B→D(*)τ¯ν/B→D(*)ℓ¯ν and Bc→J/ψτ¯ν/Bc→J/ψℓ¯ν by the BABAR, Belle and LHCb collaborations consistently point towards an abundance of taus compared to channels with light leptons. However, the ratio Λb→Λcτ¯ν/Λb→Λcℓ¯ν shows a relative deficit in taus. In this paper, we critically address whether data still points towards a coherent pattern of deviations, in particular in light of the sum rule relating these decays in a model-independent way. We find that no common new physics explanation of all ratios is possible (within 2σ or 1.5σ, depending on the R(Λc) normalization to light lepton channels). While this inconsistency could be a statistical fluctuation, further measurements are required in order to converge to a coherent pattern of experimental results.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:8 March 2023
Deposited On:29 Dec 2023 10:12
Last Modified:28 Jun 2024 03:31
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/physrevd.107.055005
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)