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Model of soft CP violation using scalars with quark number two
P H Frampton1, S L Glashow, T Yoshikawa
1Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599-3255, USA.
Physical Review Letters
|July 20, 2001
Summary
This study introduces a new model for CP violation, explaining kaon CP violation without the strong CP problem. It predicts new "duark" particles and a flat unitarity triangle in B-meson decays.
Area of Science:
- Particle Physics
- Quantum Chromodynamics
- Beyond Standard Model Physics
Background:
- The strong CP problem remains a significant puzzle in particle physics.
- Observed CP violation in the neutral kaon sector requires explanation.
- Existing models may not fully account for all observed CP-violating phenomena.
Purpose of the Study:
- To propose a novel model of soft CP violation that resolves the strong CP problem.
- To describe both direct and indirect CP violation in the neutral kaon system.
- To predict new phenomena and observable consequences.
Main Methods:
- Introducing two new scalar mesons, termed "duarks," with quark number two.
- Assigning complex, CP-violating bare masses to these duark mesons.
- Coupling duark mesons to quark pairs to mediate interactions.
Main Results:
- The model successfully describes observed CP violation in neutral kaons.
- It evades the strong CP problem by construction.
- Predicts the existence of observable duark mesons with masses in the multi-hundred GeV range.
Conclusions:
- The proposed duark model offers a viable solution to the strong CP problem.
- It predicts a flat unitarity triangle, implying no direct CP violation in B-meson decays.
- Suggests a potentially anomalous branching ratio for the K+ --> pi(+)nu(nu) decay.