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Measurement of the ratios of branching fractions ℛ⁡(𝐷*) and ℛ⁡(𝐷0)

The ratios of branching fractions ℛ⁡(𝐷*)≡ℬ⁡(¯𝐵→𝐷*⁢𝜏−⁢¯𝜈𝜏)/ℬ⁡(¯𝐵→𝐷*⁢𝜇−⁢¯𝜈𝜇) and ℛ⁡(𝐷0)≡ℬ⁡(𝐵−→𝐷0⁢𝜏−⁢¯𝜈𝜏)/ℬ⁡(𝐵−→𝐷0⁢𝜇−⁢¯𝜈𝜇) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0  fb−1 of integrated luminosity recorded by the LHCb experiment during 2...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Caspary, Rowina (Author) , Frau, Giulia (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 13 September 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 11, Pages: 1-13
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.111802
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.131.111802
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.111802
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Author Notes:R. Aaij et al. (LHCb Collaboration)*

MARC

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520 |a The ratios of branching fractions ℛ⁡(*)≡ℬ⁡(¯→*⁢−⁢¯)/ℬ⁡(¯→*⁢−⁢¯) and ℛ⁡(0)≡ℬ⁡(−→0⁢−⁢¯)/ℬ⁡(−→0⁢−⁢¯) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0  fb−1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode −→−⁢⁢¯. The measured values are ℛ⁡(*)=0.281±0.018±0.024 and ℛ⁡(0)=0.441±0.060±0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is =−0.43. The results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the standard model. 
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