Impact on | $V_{us}$| from decays: New BaBar results on $\tau^- \to K^- n \pi^0\nu_{\tau}$(n = 0, 1, 2, 3) and $\tau^- \to \pi^- n \pi^0 \nu_{\tau}$(n = 3, 4)

IF 5.9 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Rivista Del Nuovo Cimento Pub Date : 2020-01-01 DOI:10.1393/NCC/I2019-19252-1
A. Filippion
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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.
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Impact on |美国V_{} |美元美元从decays: New BaBar results on美元\知道^ - ^ 0 \ n到K ^ - pi nu_{\知道}美元(n = 0, 1, 2, 3)和美元\知道^ - ^ \到pi - n pi ^ 0 \ nu_{\知道的(n = 3, 4美元)
本文报道了τ强子衰变在一个负kaon或π介子和多个π0通道中的分支分数的初步测量:τ−→K−nπ - 0ντ (n = 0,1,2,3)和τ−→π−nπ - 0ντ (n = 3,4)。这些测量对于精确测定|Vus| Cabibbo-Kobahashi-Maskawa矩阵元素具有重要意义。根据BABAR实验近十年来收集的Υ(4S)峰及附近e+e−碰撞产生的约4.35亿个τ对数据样本,得到了以下值:B(τ−−→Kντ)=(7.174±0.033统计±0.213 sys)×10−3 B(τ−→K−π0ντ)=(5.054±0.021统计±0.148 sys)×10−3 B(τ−−2π0→Kντ)=(6.151±0.117统计±0.338 sys)×10−4 B(τ−−3π0→Kντ)=(1.246±0.164统计±0.238 sys)×10−4 B(τ−→π−3π0ντ)=(1.168±0.006统计±0.038 sys)×10−2和B(τ−→π−4π0ντ)=(9.020±0.400统计±0.652 sys)×10−4。
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Rivista Del Nuovo Cimento
Rivista Del Nuovo Cimento 物理-物理:综合
CiteScore
9.50
自引率
2.20%
发文量
11
审稿时长
>12 weeks
期刊介绍: La Rivista del Nuovo Cimento is an international peer-reviewed journal. It publishes monographs in all fields of physics. These monographies aim at presenting the state of the art of topical subjects of relevant interest for the community. Usually, authors are invited and topics suggested by the Deputy Editors-in-Chief, but also spontaneous submissions are examined.
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