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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Bs-Bs mixing in grand unified models
Bhaskar Dutta1, Yukihiro Mimura
1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.
Physical Review Letters
|February 7, 2007
Summary
Supersymmetry grand unified models link tau-->mugamma decay rates to Bs-Bs mixing. Enhanced tau decays suggest large supersymmetric contributions to Bs-Bs mixing, testable via CP asymmetries in Bs decays.
Area of Science:
- Particle Physics
- Supersymmetry
- Grand Unification Theories
- Flavor Physics
Background:
- Investigating flavor mixing in the second and third generation squarks within SO(10) and SU(5) supersymmetry grand unified models.
- Exploring the role of flavor-violating sources in Dirac and Majorana couplings, which are also responsible for neutrino mixings.
Purpose of the Study:
- To analyze the implications of enhanced tau-->mugamma decay branching ratios on Bs-Bs mixing.
- To determine if supersymmetry in SO(10) boundary conditions can lead to significant contributions to Bs-Bs mixing.
Main Methods:
- Theoretical analysis of supersymmetry grand unified models (SO(10), SU(5)).
- Correlation of squark flavor mixings with neutrino mixing sources.
- Examination of the impact of enhanced tau-->mugamma decay rates on Bs-Bs mixing parameters.
Main Results:
- A significant correlation is found between enhanced tau-->mugamma decay rates and Bs-Bs mixing.
- Supersymmetry within SO(10) boundary conditions can introduce large contributions to Bs-Bs mixing.
- The phase of Bs-Bs mixing is found to be large, particularly for small tanbeta and large scalar mass (m0).
Conclusions:
- Enhanced tau-->mugamma decay rates suggest potentially large supersymmetric contributions to Bs-Bs mixing.
- The large phase in Bs-Bs mixing, driven by specific supersymmetric scenarios, is experimentally testable.
- Measuring CP asymmetries in Bs decay modes can probe these supersymmetric effects and constrain models.
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