Do squarks have to be degenerate? Constraining the mass splitting with Kaon and D mixing

Abstract

We study the constraints on the mass-splitting of the first two generations of left-handed squarks obtained from Delta M_K, epsilon_K and D mixing. The different contributions from gluino, neutralino and chargino diagrams are examined in detail, concluding that it is not justified to neglect electroweak gaugino diagrams if the squark mass matrices contain flavor non-diagonal LL elements. We find that the constraints on the mass-splitting are very strong for light gluino masses. However, if the gluino is heavier than the squarks the constraints on the mass-splitting are much weaker. There are even large regions in parameter space where the different NP contributions cancel each other, leaving the mass-splitting nearly unconstrained.

7 pages, 3 figures

References in corpus (5)

• Combining K-\bar K mixing and D-\bar D mixing to constrain the flavor structure of new physics
• D-Dbar mixing and new physics: general considerations and constraints on the MSSM
• The MFV limit of the MSSM for low tan(beta): meson mixings revisited
• Lessons from Recent Measurements of D-\bar D Mixing
• Flavour violating squark and gluino decays

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