We report on a precision measurement of the ratio Rτμϒ(3S)=B(ϒ(3S)→τ+τ-)/B(ϒ(3S)→μ+μ-) using data collected with the BABAR detector at the SLAC PEP-II e+e- collider. The measurement is based on a 28 fb-1 data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million ϒ(3S) mesons. The ratio is measured to be Rτμϒ(3S)=0.966±0.008stat±0.014syst and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in Rτμϒ(3S) is almost an order of magnitude smaller than the only previous measurement.
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2020). Precision Measurement of the Ratio B (ϒ (3S) →τ+τ-) / B (ϒ (3S) →μ+μ-). PHYSICAL REVIEW LETTERS, 125(24) [10.1103/PhysRevLett.125.241801].
Precision Measurement of the Ratio B (ϒ (3S) →τ+τ-) / B (ϒ (3S) →μ+μ-)
Carpinelli M.Membro del Collaboration Group
;
2020
Abstract
We report on a precision measurement of the ratio Rτμϒ(3S)=B(ϒ(3S)→τ+τ-)/B(ϒ(3S)→μ+μ-) using data collected with the BABAR detector at the SLAC PEP-II e+e- collider. The measurement is based on a 28 fb-1 data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million ϒ(3S) mesons. The ratio is measured to be Rτμϒ(3S)=0.966±0.008stat±0.014syst and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in Rτμϒ(3S) is almost an order of magnitude smaller than the only previous measurement.
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Precision Measurement of the Ratio B(ϒ(3S)→τ+τ-)_B(ϒ(3S)→μ+μ-) - PhysRevLett.125.241801.pdf
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