Search for the weak radiative decay Λ_c⁺→ Σ⁺γ at BESIII

2022/12/14 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +567
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2212.07214

Abstract

The Cabibbo-allowed weak radiative decay Λ_c⁺→ Σ⁺γ has been searched for in a sample of Λ_c⁺Λ_c^- pairs produced in e⁺e^- annihilations, corresponding to an integrated luminosity of 4.5 fb^-1 collected with the BESIII detector at center-of-mass energies between 4.60 and 4.70 GeV. No excess of signal above background is observed, and we set an upper limit on the branching fraction of this decay to be \mathcal B(Λ_c⁺→ Σ⁺γ)<4.4×10^-4 at a confidence level of 90%, which is in agreement with Standard Model expectations.

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