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Measuring the CP violating phase gamma using B+/- --> pi(+/-)pi(+)pi(-) and B+/- --> K+/-pi(+)pi(-) decays
R E Blanco1, C Göbel, R Méndez-Galain
1Instituto de Física, Facultad de Ingeniería, Univ. de la República, CC 30, CP 11000 Montevideo, Uruguay.
Physical Review Letters
|April 6, 2001
Summary
Researchers present a new method to measure the angle gamma using B-meson decays and SU(3) symmetry. This simple procedure, free from final state interactions, promises highly accurate measurements of gamma in the near future.
Area of Science:
- High-energy physics
- Particle physics
- Quantum chromodynamics
Background:
- Measuring the angle gamma is crucial for understanding CP violation in the Standard Model.
- Previous methods faced challenges with final state interactions and theoretical uncertainties.
Purpose of the Study:
- To introduce a novel and simplified procedure for determining the CKM angle gamma.
- To provide a method with reduced theoretical error and improved accuracy.
Main Methods:
- Utilizing SU(3) symmetry in conjunction with a full Dalitz plot analysis of B+/--->pi(+/-)pi(+)pi(-) and B+/--->K+/-pi(+)pi(-) decays.
- Incorporating all relevant diagrams, including strong and electroweak penguins.
Main Results:
- The proposed method is independent of final state interaction uncertainties.
- The expected theoretical error for gamma extraction is minimal, potentially of the order of 10(0) or less.
Conclusions:
- This new procedure offers a promising path towards the most precise measurement of gamma to date.
- Combined with data from B factories and CLEO, it could yield significant advancements in CP violation studies.