Filippi, A. (2019) Impact on |Vus| from τ decays: New BaBar results on τ − → K−nπ0ντ (n = 0, 1, 2, 3) and τ − → π−nπ0ντ (n = 3, 4). Il nuovo cimento C, 42 (6). pp. 1-7. ISSN 1826-9885
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Abstract
This paper reports preliminary measurements of the branching fractions of τ hadronic decays in channels with one negative kaon or pion and multiple π0’s: τ − → K−nπ0ντ (with n = 0, 1, 2, 3) and τ − → π−nπ0ντ (with n = 3, 4). These measurements are of fundamental importance for the precise determination of the |Vus| Cabibbo-Kobahashi-Maskawa matrix element. Based on a data sample of about 435 million τ pairs produced in e+e− collisions at and near the Υ(4S) peak, collected by the BABAR experiment in about ten years of data taking, the following values have been obtained: B(τ − → K−ντ ) = (7.174 ± 0.033stat ± 0.213sys) × 10−3, B(τ − → K−π0ντ ) = (5.054 ± 0.021stat ± 0.148sys) × 10−3, B(τ − → K−2π0ντ ) = (6.151 ± 0.117stat ± 0.338sys) × 10−4, B(τ − → K−3π0ντ ) = (1.246 ± 0.164stat ± 0.238sys) × 10−4, B(τ − → π−3π0ντ ) = (1.168 ± 0.006stat ± 0.038sys) × 10−2 and B(τ − → π−4π0ντ ) = (9.020 ± 0.400stat ± 0.652sys) × 10−4.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 29 Jan 2021 15:08 |
| Last Modified: | 29 Jan 2021 15:08 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/20695 |
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