منابع مشابه
Quarks , Squarks and Textures
By studying symmetric mass textures for the up and down quark sectors, and expanding in a small parameter λ ∼ sinθC, bounds are set on entries commonly assumed to vanish. Consequences of a 2 + 1 family structure which can result from horizontal symmetry are examined. Generalizing to squarks, we study suppression of Flavor Changing Neutral Currents by mass degeneracy and/or small mixing angles. ...
متن کاملDiffusion and Decoherence of Squarks and Quarks During the Electroweak Phase Transition
To estimate the diffusion constant D of particles in a plasma, we develop a method that is based on the mean free path λ for scatterings with momentum transfer q ∼ T . Using this method, we estimate λ and D for squarks and quarks during the electroweak phase transition. Assuming that Debye and magnetic screening lengths provide infrared cutoffs, our calculations yield λ ∼ 18/T and D ∼ 5/T for b...
متن کاملImproved SUSY QCD corrections to Higgs boson decays into quarks and squarks
We improve the calculation of the supersymmetric O(αs) QCD corrections to the decays of Higgs bosons into quarks and squarks in the Minimal Supersymmetric Standard Model. In the on–shell renormalization scheme these corrections can be very large, which makes the perturbative expansion unreliable. This is especially serious for decays into bottom quarks and squarks for large tan β. Their correct...
متن کاملSearch for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios
Results of a search for supersymmetry via direct production of third-generation squarks are reported, using 20.3 fb−1 of proton-proton collision data at ffiffi s p 1⁄4 8 TeV recorded by the ATLAS experiment at the LHC in 2012. Two different analysis strategies based on monojetlike and c-tagged event selections are carried out to optimize the sensitivity for direct top squark-pair production in ...
متن کاملShould Squarks Be Degenerate?
For generic squark masses, box diagrams with squarks and gluinos give unacceptably large contributions to neutral meson (K, B and D) mixing. The standard solution to this problem is to assume that squarks are degenerate to a very good approximation. We suggest an alternative mechanism to suppress squark contributions to flavor changing neutral currents: the alignment of quark with squark mass m...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.55.5501