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Precision measurement of the branching fraction for the decay $\psi(2S)\rightarrow\tau^{+}\tau^{-}$ at BESIII

Year: 2026

Type: conference-paper

Abstract: Using (2259.3 ± 11.1) × 106𝜓(2𝑆) events acquired with the BESIII detector, the branching fraction of 𝜓(2𝑆) → 𝜏+𝜏− is measured with improved precision to be 𝐵𝑟(𝜓(2𝑆) → 𝜏+𝜏−) = (3.240±0.023±0.081)×10−3,wherethefirstandseconduncertaintiesarestatisticalandsystematic, respectively, which is consistent with the world average value within one standard deviation. This value, along with those for the branching fractions of the 𝜓(2𝑆) decaying into 𝑒+𝑒− and 𝜇+𝜇−, is in good agreement with the relation predicted by the sequential lepton hypothesis.

Source: European Physical Society Conference on High Energy Physics (EPS-HEP)

DOI: 10.22323/1.485.0236

Authors: Jianyong Zhang, Bingxin Zhang, Xiaohu Mo, Ping Wang, Isabella Garzia

Institutions: University of Ferrara, Chinese Academy of Sciences, Institute of High Energy Physics

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W7125715463

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