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Observation of B+-->psi(3770)K+.
Physical Review Letters
|August 25, 2004
Summary
Researchers observed the B+ meson decaying into psi(3770) and K+ for the first time, measuring its branching fraction. They also studied other B+ decays and searched for X(3872) particle decays using Belle detector data.
Area of Science:
- Particle Physics
- High Energy Physics
- Experimental Physics
Background:
- The B+ meson is a fundamental particle in particle physics.
- Understanding B+ meson decays provides insights into the Standard Model.
- Previous studies have explored various B+ decay modes.
Purpose of the Study:
- To report the first observation of the B+ --> psi(3770)K+ decay.
- To measure the branching fractions of B+ --> psi(3770)K+, B+ --> D0(-)D0K+, and B+ --> D+D-K+.
- To search for decays of the X(3872) particle into D(-)D and D0(-)D(0)pi(0) final states.
Main Methods:
- Analysis of 88 fb^-1 of data collected by the Belle detector at the KEKB collider.
- Reconstruction of the psi(3770) resonance in D0(-)D(0) and D+D- decay channels.
- Measurement of branching fractions and setting of upper limits using statistical analysis.
Main Results:
- Observed the decay B+ --> psi(3770)K+ with a branching fraction of (0.48 +/- 0.11 +/- 0.07) x 10^-3.
- Measured the branching fraction for B+ --> D0(-)D0K+ to be (1.17 +/- 0.21 +/- 0.15) x 10^-3.
- Set a 90% confidence level upper limit for B+ --> D+D-K+ at 0.90 x 10^-3.
Conclusions:
- The first observation of B+ --> psi(3770)K+ provides new data for B physics.
- The measured branching fractions contribute to a more complete understanding of B+ decays.
- The search for X(3872) decays did not yield significant results in the analyzed channels.