Abstract
We report the first observation of the decay Λc+→Σ−π+π+π0, based on data obtained in e+e− annihilations with an integrated luminosity of 567 pb−1 at s=4.6 GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λc+→Σ−π+π+π0) is determined to be (2.11±0.33(stat.)±0.14(syst.))%. In addition, an improved measurement of B(Λ+c→Σ−π+π+) is determined as (1.81±0.17(stat.)±0.09(syst.))%.
Highlights
The study of hadronic decays of charmed baryons provides important information to understand both the strong and the weak interactions [1]
Searching for additional decay modes with − in the final state is important to build up knowledge on
We report the first observation of the so-far undetermined, but expected to be large, decay of
Summary
The study of hadronic decays of charmed baryons provides important information to understand both the strong and the weak interactions [1]. Measured decay modes account for only about 60% [3] of all. + c decays, primarily consisting of modes with a ( ) hyperon or a proton in the final state. Searching for additional decay modes with − in the final state is important to build up knowledge on. The analysis technique in this work, which was first applied in the Mark III experiment [6], is optimized for measuring charm hadron pairs produced near threshold. − c is reconstructed in an exclusive hadronic decay mode, designated as the single-tag (ST) sample. Events in this ST sample are searched for the signal channel.
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