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Observation of the decay B0-->lambda+cp.
1High Energy Accelerator Research Organization (KEK), Tsukuba.
Physical Review Letters
|April 12, 2003
Summary
Researchers observed a new type of B meson decay, B0 to Lambda+c p, with a measured branching fraction. This marks the first observation of a two-body baryonic B decay, offering insights into particle physics.
Area of Science:
- Particle Physics
- High Energy Physics
- Hadron Spectroscopy
Background:
- Baryonic B decays are crucial for understanding the Standard Model.
- Previous studies have focused on non-baryonic B decays.
- The observation of two-body baryonic B decays remained elusive.
Purpose of the Study:
- To measure the branching fraction of the charmed baryonic decay B0 --> Lambda+c p.
- To report the first observation of a two-body baryonic B decay.
- To contribute to the understanding of B meson decays and fundamental symmetries.
Main Methods:
- Analysis of 78.2 fb^-1 of data collected at the Upsilon(4S) resonance.
- Utilized the Belle detector at the KEKB asymmetric e+e- collider.
- Measured the branching fraction using a specific decay channel: Lambda+c --> p K- pi+.
Main Results:
- Observed the decay B0 --> Lambda+c p with a branching fraction of (2.19(+0.56)(-0.49) +/- 0.32 +/- 0.57)x10^-5.
- Achieved a statistical significance of 5.8 sigma for this observation.
- This represents the first experimental evidence for a two-body baryonic B decay.
Conclusions:
- The discovery of the B0 --> Lambda+c p decay provides new insights into hadronic B decays.
- This finding opens a new avenue for studying baryonic B decays.
- Further theoretical and experimental investigations are warranted to explore this decay mode.