First observation of the decay ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}{\pi }^0$

Abstract

Based on 4.5 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data accumulated at center-of-mass energies between $4599.53$ MeV and $4698.82$ MeV with the BESIII detector, the decay ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}{\pi }^0$ is observed for the first time with a significance of $9.2\sigma$. The branching fraction is measured to be $(0.85\pm 0.13\pm 0.03)\%$, where the first uncertainty is statistical and the second systematic, which differs from the theoretical prediction based on isospin by 4.4$\sigma$. This indicates that there may be resonant contributions or some unknown dynamics in this decay.

References in corpus (21)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Future Physics Programme of BESIII
• Kernel Estimation in High-Energy Physics
• Method for detector description transformation to Unity and application in BESIII
• Measurements of absolute hadronic branching fractions of ${\Lambda }_c^{+}$ baryon
• Charmed Baryon Physics Circa 2021
• Cabibbo-allowed nonleptonic weak decays of charmed baryons
• Measurement of the center-of-mass energies at BESIII via the di-muon process
• Study of the Standard Model with weak decays of charmed hadrons at BESIII
• Luminosities and energies of $e^{+}{e}^{-}$ collision data taken between $\sqrt{s}$=4.612 GeV and 4.946 GeV at BESIII
• Recent Progress in Leptonic and Semileptonic Decays of Charmed Hadrons
• Analysis of Two-Body Decays of Charmed Baryons Using the Quark-Diagram Scheme
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Measurement of the Energy-Dependent Electromagnetic Form Factors of a Charmed Baryon
• Observation of ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}$
• An overview of ${\Lambda }_c$ decays
• Observations of the Cabibbo-Suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, $n{\pi }^{+}{\pi }^{-}{\pi }^{+}$ and the Cabibbo-Favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$
• Measurement of the absolute branching fraction of the inclusive decay ${\bar{\Lambda }}_c^{-}\to \bar{n}+X$