Measurement of the Ratios of Branching Fractions R(D
Phys Rev Lett
; 131(11): 111802, 2023 Sep 15.
Article
in En
| MEDLINE
| ID: mdl-37774262
ABSTRACT
The ratios of branching fractions R(D^{*})≡B(B[over ¯]âD^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]âD^{*}µ^{-}ν[over ¯]_{µ}) and R(D^{0})≡B(B^{-}âD^{0}τ^{-}ν[over ¯]_{τ})/B(B^{-}âD^{0}µ^{-}ν[over ¯]_{µ}) 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 τ^{-}âµ^{-}ν_{τ}ν[over ¯]_{µ}. The measured values are R(D^{*})=0.281±0.018±0.024 and R(D^{0})=0.441±0.060±0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ=-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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
Phys Rev Lett
Year:
2023
Document type:
Article
Affiliation country:
Países Bajos