Rare and forbidden B and tau decays in the Belle

11th International Conference on Hyperons, Charm and Beauty Hadrons

Hyun, Hyo Jung^1,2,2

Department of Physics, Kyungpook National University, Daegu

702-701, Korea, Republic of^1

Pohang Accelerator Laboratory, Jigokro-127-beongil, Nam-gu, Pohang

790-834, Korea, Republic of^2

关键词: Asymmetric energy;    Belle detectors;    Data sample;    Decay mode;    Lepton flavor violation;    Leptonic decay;    New physics;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/556/1/012049/pdf
DOI  :  10.1088/1742-6596/556/1/012049

来源: IOP

【 摘 要 】

A search for the purely leptonic decays B+→ e+veand B+→ μ+vμwas performed using the 772 million BB¯ pairs collected by the Belle detector at the KEKB asymmetric-energy e+e-collider. There was no evidence of a signal in either decay modes. A heavy neutral leptonlike new particle and heavy neutrino searches were also performed, but no significant signals were observed. Lepton flavor violation in τ decays was studied with an almost full data sample and the upper limits obtained were in the order of 10-8. In this paper, recent results that can give any constraints to new physics are briefly described.