Chirally enhanced corrections to flavor-changing neutral current processes in the generic MSSM

Journal Article · Sat May 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.095007· OSTI ID:21409971

Crivellin, Andreas; Nierste, Ulrich ^[1]

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1. Institut fuer Theoretische Teilchenphysik, Karlsruhe Institute of Technology, Universitaet Karlsruhe, 76128 Karlsruhe (Germany)

Chirally enhanced supersymmetric QCD corrections to flavor-changing neutral current processes are investigated in the framework of the minimal supersymmetric standard model with generic sources of flavor violation. These corrections arise from flavor-changing self-energy diagrams and can be absorbed into a finite renormalization of the squark-quark-gluino vertex. In this way enhanced two-loop and even three-loop diagrams can be efficiently included into a leading-order calculation. Our corrections substantially change the values of the parameters {delta}{sub 23}{sup dLL}, {delta}{sub 23}{sup dLR}, {delta}{sub 23}{sup dRL}, and {delta}{sub 23}{sup dRR} extracted from Br[B{yields}X{sub s{gamma}}] if tan{beta} is large. We find stronger (weaker) constraints compared to the leading-order result for negative (positive) values of {mu}. The constraints on {delta}{sub 13}{sup dLR,RL} and {delta}{sub 23}{sup dLR,RL} from B{sub d}-B{sub d} and B{sub s}-B{sub s} mixing change drastically if the third-generation squark masses differ from those of the first two generations. K-K mixing is more strongly affected by the chirally enhanced loop diagrams and even subpercent deviations from degenerate down and strange squark masses lead to profoundly stronger constraints on {delta}{sub 12}{sup dLR,RL}.

• OSTI ID: 21409971
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 9; Other Information: DOI: 10.1103/PhysRevD.81.095007; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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NEUTRAL CURRENTS
QUANTUM CHROMODYNAMICS
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SELF-ENERGY
STANDARD MODEL
SUPERSYMMETRY
ALGEBRAIC CURRENTS
COMPOSITE MODELS
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FIELD THEORIES
GRAND UNIFIED THEORY
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