Observation of B(0) --> D0pi(0) and B(0) -->D(*0)pi(0)

Area of Science:

• Particle Physics
• High Energy Physics
• Quantum Chromodynamics

Background:

• Neutral B meson decays provide crucial tests for the Standard Model of particle physics.
• Color-suppressed hadronic decays are sensitive probes of fundamental interactions.
• Understanding decay amplitudes and strong phases is key to refining theoretical models.

Purpose of the Study:

• To investigate the color-suppressed hadronic decays of neutral B mesons into D0pi0 and D*0pi0 final states.
• To measure the branching fractions for these specific decay modes.
• To determine the strong phases between isospin amplitudes in the Dpi and D*pi systems.

Main Methods:

• Analysis of approximately 9.67 x 10^6 BBbar pairs collected by the CLEO detector.
• Observation and statistical analysis of B0 --> D0pi0 and B0 --> D*0pi0 decay channels.
• Calculation of branching fractions and determination of strong phase differences using measured decay rates.

Main Results:

• Observation of B0 --> D0pi0 with a branching fraction of (2.74 +0.36 -0.32 +/- 0.55) x 10^-4 and a statistical significance of 12.1 sigma.
• Observation of B0 --> D*0pi0 with a branching fraction of (2.20 +0.59 -0.52 +/- 0.79) x 10^-4 and a statistical significance of 5.9 sigma.
• Determination of cos(delta(I,D)) = 0.89 +/- 0.08 and cos(delta(I,D*)) = 0.89 +/- 0.08 for the strong phases.

Conclusions:

• The study successfully observed and quantified two color-suppressed hadronic decay modes of the neutral B meson.
• The measured branching fractions and strong phases provide valuable data for testing theoretical predictions in particle physics.
• The results contribute to a deeper understanding of the dynamics governing B meson decays and quark interactions.