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

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

2010-02-12

arxiv.org/abs/1002.2653v2

Phys.Rev.D81:095004,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures

Scientific paper

10.1103/PhysRevD.81.095004

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.

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