Prospects for rare and forbidden hyperon decays at BESIII

Abstract

Abstract The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of J / ψ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron–Positron Collider II. About 10 6 –10 8 hyperons, i.e., Λ , Σ , Ξ , and Ω , will be produced in the J / ψ and ψ (2 S ) decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of 10 −5 –10 −8 . In addition, with the known center-of-mass energy and “tag technique”, rare decays and decays with invisible final states can be probed.