Abstract
Using (10.087±0.044)×109 J/ψ events collected by the Beijing Spectrum III (BESIII) detector at the Beijing Electron Positron Collider II (BEPCII) collider, we search for the hyperon semileptonic decay Ξ−→Ξ0e−ν¯e. No significant signal is observed and the upper limit on the branching fraction B(Ξ−→Ξ0e−ν¯e) is set to be 2.59×10−4 at 90% confidence level. This result is one order of magnitude more strict than the previous best limit.Received 22 August 2021Accepted 20 September 2021DOI:https://doi.org/10.1103/PhysRevD.104.072007Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasLeptonic, semileptonic & radiative decaysParticles & Fields
Highlights
hadronic structures formed through strong interactions
symmetry is manifestly broken in hyperon semileptonic decays
symmetry breaking could be further revealed in nature
Summary
Studies of hyperon semileptonic decays provide important information on the interplay between weak interactions and hadronic structures formed through strong interactions. With more complete information on hyperon semileptonic decays, the patterns of flavor SU(3) symmetry breaking could be further revealed in nature [2,3]. Since the branching fractions of hyperon semileptonic decays are on the order of 10−4 or smaller [4], studies of hyperon semileptonic decays are still an experimental challenge. Within this sample, a large number of Ξ− events (∼106 [8]) are produced via the decay mode J=ψ → Ξ−Ξþ and the expected sensitivity on the branching fraction will be on the order of 10−4, thereby providing a good opportunity to study this hyperon semileptonic decay. Ξ0e−νe is on the order of 10−10 [12], and a theoretical calculation [2] shows that the effect of flavor SU(3) symmetry breaking is evident in the Ξ− → Ξ0e−νe decay. Events collected at 3.097 GeV=c2 with a center-of-mass (CM) the BESIII detector
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