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

The ratios of branching fractions ℛ⁑(𝐷*)≑ℬ⁑(¯𝐡→𝐷*β’πœβˆ’β’Β―πœˆπœ)/ℬ⁑(¯𝐡→𝐷*β’πœ‡βˆ’β’Β―πœˆπœ‡) and ℛ⁑(𝐷0)≑ℬ⁑(π΅βˆ’β†’π·0β’πœβˆ’β’Β―πœˆπœ)/ℬ⁑(π΅βˆ’β†’π·0β’πœ‡βˆ’β’Β―πœˆπœ‡) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0  fbβˆ’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)*
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Summary:The ratios of branching fractions ℛ⁑(𝐷*)≑ℬ⁑(¯𝐡→𝐷*β’πœβˆ’β’Β―πœˆπœ)/ℬ⁑(¯𝐡→𝐷*β’πœ‡βˆ’β’Β―πœˆπœ‡) and ℛ⁑(𝐷0)≑ℬ⁑(π΅βˆ’β†’π·0β’πœβˆ’β’Β―πœˆπœ)/ℬ⁑(π΅βˆ’β†’π·0β’πœ‡βˆ’β’Β―πœˆπœ‡) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0  fbβˆ’1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode πœβˆ’β†’πœ‡βˆ’β’πœˆπœβ’Β―πœˆπœ‡. The measured values are ℛ⁑(𝐷*)=0.281Β±0.018Β±0.024 and ℛ⁑(𝐷0)=0.441Β±0.060Β±0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is 𝜌=βˆ’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.
Item Description:*LHCb Collaboration: R. Aaij, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, J. Marks, M.P. Morgenthaler, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola [und 1047 weitere Personen]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.111802

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