Rates, polarizations, and asymmetries in charmless vector-vector B meson decays.

Area of Science:

• Particle Physics
• High Energy Physics
• Quantum Chromodynamics

Background:

• B meson decays provide insights into the Standard Model of particle physics.
• Understanding charmless vector meson decays is crucial for testing fundamental symmetries.

Purpose of the Study:

• To search for B meson decays into pairs of charmless vector mesons.
• To measure branching fractions and longitudinal polarization.
• To investigate CP violation asymmetries in selected B meson decay modes.

Main Methods:

• Analysis of approximately 89 million B(-)B pairs collected by the BABAR detector.
• Identification and reconstruction of final states involving phi, rho, and K* vector mesons.
• Statistical analysis to determine branching fractions, polarization, and CP asymmetries.

Main Results:

• Measurements of branching fractions for decays such as B+-->phiK(*+), B0-->phiK(*0), B+-->rho(0)K(*+), and B+-->rho(0)rho(+).
• Determination of the degree of longitudinal polarization in these decays.
• Searches for CP violation asymmetries, providing constraints on new physics models.

Conclusions:

• The study contributes precise measurements of charmless vector meson decays.
• Results provide stringent tests of the Standard Model and potential probes for new physics.
• Upper limit set on the branching fraction for the B0-->rho(0)rho(0) decay.