6533b839fe1ef96bd12a6651
RESEARCH PRODUCT
B-parameters for ΔS=2 supersymmetric operators
Livio ContiLeonardo GiustiA. VladikasM. TaleviAndrea DoniniV. GimenezG. MartinelliC.r. Alltonsubject
DeltaNuclear and High Energy PhysicsHigh Energy Physics::LatticeLattice (group)FOS: Physical sciencesQuenched approximationRenormalizationMatrix (mathematics)Theoretical physicsHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)Lattice (order)Mixing (physics)Mathematical physicskaon decays lattice supersymmetryPhysicsHigh Energy Physics - Lattice (hep-lat)FísicaSupersymmetryAtomic and Molecular Physics and Opticskaone decays lattice supersymmetryFIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICIHigh Energy Physics - PhenomenologyStandard Model (mathematical formulation)SfermionNon-perturbativedescription
We present a calculation of the matrix elements of the most general set of DeltaS=2 dimension-six four-fermion operators. The values of the matrix elements are given in terms of the corresponding B-parameters. Our results can be used in many phenomenological applications, since the operators considered here give important contributions to K^0--K^0bar mixing in several extensions of the Standard Model (supersymmetry, left-right symmetric models, multi-Higgs models etc.). The determination of the matrix elements improves the accuracy of the phenomenological analyses intended to put bounds on basic parameters of the different models, as for example the pattern of the sfermion mass matrices. The calculation has been performed on the lattice, using the tree-level improved Clover action at two different values of the strong coupling constant (beta=6/g_0^2(a)=6.0 and 6.2, corresponding to a^-1= 2.1 and 2.7 GeV respectively), in the quenched approximation. The renormalization constants and mixing coefficients of the lattice operators have been obtained non-perturbatively.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-06-16 |