First search for the weak radiative decays Λc+→Σ+γ and Ξc0→Ξ0γ

Abstract

We present the first search for the weak radiative decays Λc+→Σ+γ and Ξc0→Ξ0γ using a data sample of 980 fb−1 collected by the Belle detector operating at the KEKB asymmetric-energy e+e− collider. There are no evident Λc+→Σ+γ or Ξc0→Ξ0γ signals. Taking the decays Λc+→pK−π+ and Ξc0→Ξ−π+ as normalization channels, the upper limits at 90% credibility level on the ratios of branching fractions B(Λc+→Σ+γ)/B(Λc+→pK−π+)<4.0×10−3 and B(Ξc0→Ξ0γ)/B(Ξc0→Ξ−π+)<1.2×10−2 are determined. We obtain the upper limits at 90% credibility level on the absolute branching fractions B(Λc+→Σ+γ)<2.6×10−4 and B(Ξc0→Ξ0γ)<1.8×10−4.Received 27 June 2022Accepted 2 August 2022DOI:https://doi.org/10.1103/PhysRevD.107.032001Published 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 AreasBranching fractionElectroweak radiative correctionsPhysical SystemsCharmed baryonsParticles & Fields