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

Journal Article · Sat May 01 04:00:00 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
COMPOSITE MODELS
CORRECTIONS
CURRENTS
ENERGY
FERMIONS
FIELD THEORIES
FLAVOR MODEL
GRAND UNIFIED THEORY
MASS
MATHEMATICAL MODELS
MIXING
NEUTRAL CURRENTS
PARTICLE MODELS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
RENORMALIZATION
SELF-ENERGY
STANDARD MODEL
SUPERSYMMETRY
SYMMETRY
UNIFIED GAUGE MODELS