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Related Experiment Videos

Observation of Λ_{c}^{+}→nK_{S}^{0}π^{+}.

M Ablikim1, M N Achasov2, S Ahmed3

  • 1Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Physical Review Letters
|April 4, 2017
PubMed

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Summary

Researchers measured the Λ_{c}^{+} baryon decay into a neutron, K_{S}^{0}, and π^{+}. This first-time measurement provides crucial data for understanding baryon decays and fundamental symmetries.

Area of Science:

  • Particle Physics
  • Hadron Spectroscopy
  • Quantum Chromodynamics

Background:

  • The Λ_{c}^{+} baryon is a charm baryon crucial for testing the Standard Model.
  • Understanding baryon decays provides insights into the strong nuclear force.
  • Previous studies lacked direct measurements of Λ_{c}^{+} decays involving neutrons.

Purpose of the Study:

  • To report the first direct measurement of Λ_{c}^{+} baryon decays including a neutron.
  • To determine the absolute branching fraction of the decay Λ_{c}^{+}→nK_{S}^{0}π^{+}.
  • To test isospin symmetry and final state interactions by comparing with related decays.

Main Methods:

  • Analysis of 567 pb⁻¹ of e⁺e⁻ collision data at √s=4.599 GeV.
  • Utilized data collected by the BESIII detector at the BEPCII collider.

Related Experiment Videos

  • Observed the decay channel Λ_{c}^{+}→nK_{S}^{0}π^{+} and performed a precise branching fraction measurement.

    • Main Results:

    • The absolute branching fraction for Λ_{c}^{+}→nK_{S}^{0}π^{+} was measured to be [1.82±0.23(stat)±0.11(syst)]%.
    • This is the first direct observation and measurement of this specific decay mode.
    • The results lay the groundwork for comparing different decay channels.

    Conclusions:

    • The study provides the first direct measurement of Λ_{c}^{+}→nK_{S}^{0}π^{+}, significantly advancing the understanding of charm baryon decays.
    • The measured branching fraction offers a critical data point for theoretical models.
    • Comparison with other decay modes will further elucidate isospin symmetry and final state interaction effects in the strong interaction.