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Constraining the phase of Bs-Bs mixing
Yuval Grossman1, Yosef Nir, Guy Raz
1Department of Physics, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
Physical Review Letters
|December 13, 2006
Summary
New physics in B-s meson mixing is constrained by analyzing CP asymmetry. Current data disfavors specific phase values, suggesting new physics contributions are limited.
Area of Science:
- High Energy Physics
- Particle Physics
- Quantum Mechanics
Background:
- New physics contributions to B-s meson mixing can be described by the size (r_s^2) and phase (2θ) of the total mixing amplitude relative to the Standard Model.
- The phase of new physics contributions has remained unconstrained until now.
Purpose of the Study:
- To provide the first constraint on the semileptonic CP asymmetry in B-s decays (A_SL^s).
- To constrain the new physics phase (2θ) in B-s mixing using combined measurements from CDF and D0 Collaborations.
Main Methods:
- Utilized D0 measurements of the semileptonic CP asymmetry (A_SL) to constrain A_SL^s.
- Combined recent measurements of the mass difference (ΔM_s), width difference (ΔΓ_s), and A_SL^s from CDF and D0 Collaborations.
Main Results:
- Obtained the first constraint on the semileptonic CP asymmetry in B-s decays: A_SL^s = -0.008 ± 0.011.
- Constrained the new physics phase (2θ), finding that regions around 2θ ≈ 3π/2 and 2θ ≈ π/2 are disfavored.
Conclusions:
- The semileptonic CP asymmetry in B-s decays has been experimentally constrained for the first time.
- While further reduction in errors for ΔΓ_s and A_SL^s is needed for sensitive phase probing, current central values disfavor specific new physics phase regions.
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