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Título: | Precision Measurement of the Ratio B (ϒ (3S) →τ+τ-) / B (ϒ (3S) →μ+μ-) |
Autor: | Babar Collaboration; Lees, J. P.; Martínez-Vidal, Fernando CSIC ORCID; Oyanguren, Arantza CSIC ORCID | Fecha de publicación: | dic-2020 | Editor: | American Physical Society | Citación: | Physical Review Letters 125: 241801 (2020) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.125.241801 | URI: | http://hdl.handle.net/10261/233237 | DOI: | 10.1103/PhysRevLett.125.241801 | Identificadores: | doi: 10.1103/PhysRevLett.125.241801 issn: 1079-7114 |
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