Studies of the resonance structure in decays

Area of Science:

• High Energy Physics
• Particle Physics
• Quantum Chromodynamics

Background:

• Understanding the complex resonance structures in B0 and Bs decays is crucial for advancing particle physics.
• Previous studies have provided partial insights, but a comprehensive amplitude analysis is needed.

Purpose of the Study:

• To construct amplitude models for B0 and Bs decays.
• To precisely measure resonance parameters and study the $$ resonance.
• To calculate the coherence factor for these decays.

Main Methods:

• Analysis of pp collision data from the LHCb experiment at 7 and 8 TeV.
• Construction of amplitude models incorporating contributions from various resonances.
• Quasi model-independent study of the $$ resonance.

Main Results:

• Axial resonances are the dominant contributors to both B0 and Bs decay amplitudes.
• $$ and $$ decay modes are prominent in B0 and Bs decays, respectively.
• Precise measurements of lineshape parameters and couplings for $$, $$, and $$ resonances were obtained.
• The coherence factor was calculated to be $$.

Conclusions:

• The developed amplitude models accurately describe the resonance structure of B0 and Bs decays.
• These models are valuable tools for future precise measurements of the unitary-triangle angle $$.
• The findings will contribute to studies of charm mixing and CP violation.