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Area of Science:

Particle Physics
Hadron Spectroscopy
Quantum Chromodynamics

Background:

The Lambda c+ baryon is a charm baryon, a type of subatomic particle containing a charm quark.
Understanding the properties of Lambda c+ is crucial for testing the Standard Model of particle physics and theories of the strong force (Quantum Chromodynamics).
Previous measurements of the Lambda c+ lifetime have provided valuable insights, but greater precision is needed for more stringent tests.

Purpose of the Study:

To perform an absolute measurement of the Lambda c+ baryon's lifetime.
To improve the precision of the Lambda c+ lifetime measurement compared to existing world data.
To contribute to a better understanding of heavy quark dynamics and hadron structure.

Main Methods:

Reconstruction of Lambda c+ → pK-π+ decay events.
Analysis of data collected by the Belle II experiment at the SuperKEKB collider.
Utilizing a large dataset with a total integrated luminosity of 207.2 fb^-1 at center-of-mass energies near the ϒ(4S) resonance.

Main Results:

The measured Lambda c+ lifetime is τ(Λc+) = 203.20 ± 0.89 (statistical) ± 0.77 (systematic) fs.
This represents the most precise measurement of the Lambda c+ lifetime to date.
The result is statistically consistent with previously reported lifetime values.

Conclusions:

The precise measurement of the Lambda c+ lifetime provides a significant benchmark for theoretical models in particle physics.
This result enhances our understanding of the properties and decays of charm baryons.
The Belle II experiment continues to deliver high-precision data crucial for advancing fundamental physics research.