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Direct CP violation in B-->phiKs and new physics.
Marco Ciuchini1, Luca Silvestrini
1I.N.F.N. Sezione di Roma III and Dipartimento di Fisica, Università di Roma Tre Via della Vasca Navale 84, I-00146 Rome, Italy.
Physical Review Letters
|December 18, 2002
Summary
Large contributions from new physics to b-->s transitions may cause significant CP violation in B-->phiK decays. Our calculations using QCD factorization show this asymmetry can reach order 1, even with similar new physics structures to the standard model.
Area of Science:
- High Energy Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- Loop-induced b-->s transitions are sensitive to new physics beyond the Standard Model.
- Direct CP violation in B-->phiK decays is a key observable for probing these transitions.
Purpose of the Study:
- To compute CP-violating effects in B-->phiK decays in the presence of new physics.
- To assess the magnitude of direct CP violation under specific new physics scenarios.
Main Methods:
- Utilizing Quantum Chromodynamics (QCD) factorization techniques.
- Explicitly calculating CP-violating contributions from new physics scenarios.
Main Results:
- Sizable direct CP violation, potentially of order 1, is found in B-->phiK decays.
- This result holds even when new physics shares the Standard Model's penguin structure.
Conclusions:
- New physics contributions can significantly enhance direct CP violation in b-->s transitions.
- The B-->phiK decay provides a promising channel to search for and constrain new physics.