Constraints on Supersymmetric Theories from $\mu \to e,\gamma$

Abstract

In the absence of any additional assumption it is natural to conjecture that sizeable flavour-mixing mass entries, $\Delta m^2$, may appear in the mass matrices of the scalars of the MSSM, i.e. $\Delta m^2\sim O(m^2)$. This flavour violation can still be reconciled with the experiment if the gaugino mass, $M_{1/2}$, is large enough, leading to a {\em gaugino dominance} framework (i.e. $M_{1/2}^2\gg m^2$), which permits a remarkably model--independent analysis. We study this possibility focussing our attention on the $\mu \to e,\gamma$ decay. In this way we obtain very strong and general constraints, in particular $\frac{M_{1/2}^2}{Δm}\simgt 34\ {\rm TeV}$. On the other hand, we show that our analysis and results remain valid for values of $m^2$ much larger than $\Delta m^2$, namely for $\frac{Δm^2}{m^2}\simgt \frac{m^2} {10\ {\rm TeV^2}}$, thus extending enormously their scope of application. Finally, we discuss the implications for superstring scenarios.

12 pages, Latex, 5 figures as uuencoded compressed postscript files, uses psfig.sty

References in corpus (14)

• Model-Independent Analysis of Soft Terms in Effective Supergravity and in String Theory
• Towards a Theory of Soft Terms for the Supersymmetric Standard Model
• Duality Anomaly Cancellation, Minimal String Unification and the Effective Low-Energy Lagrangian of 4-D Strings
• Should Squarks Be Degenerate?
• Signals For Supersymmetric Unification
• One-Loop Analysis of the Electroweak Breaking in Supersymmetric Models and the Fine-Tuning Problems
• Flavor Symmetries and The Problem of Squark Degeneracy
• The Supersymmetric Flavor Problem
• Soft SUSY Breaking Terms in Stringy Scenarios: Computation and Phenomenological Viability
• Constraints on non-universal soft terms from flavor changing neutral currents
• Constraining Supergravity Scenarios through the $b\to s,\gamma$ Decay.
• Flavour Changing Neutral Current Effects From Flavour Dependent Supergravity Couplings
• Flavor changing neutral current constraints on standard-like orbifold models
• Disoriented and Plastic Soft Terms: A Dynamical Solution to the Problem of Supersymmetric Flavor Violations

Cited by in corpus (11)

• Oscillating neutrinos and mu --> e, gamma
• Stability Bounds on Flavor-Violating Trilinear Soft Terms in the MSSM
• R-parity Violation Effects through Soft Supersymmetry Breaking Terms and the Renormalisation Group
• Lepton Flavour Violation In Supersymmetric Models with Trilinear R-parity Violation
• U(1) textures and Lepton Flavor Violation
• Some Implications of Charge and Color Breaking in the MSSM
• Bi-maximal mixing and Bilinear R violation
• Charged lepton Flavor Violation in Supersymmetry with Bilinear R-Parity Violation
• Constraints on the rare tau decays from mu --> e gamma in the supersymmetric see-saw model
• CP violation in the lepton flavor violating interactions mu -> e gamma and tau -> mu gamma
• Theoretical constraints on the rare tau decays in the MSSM