6533b86cfe1ef96bd12c88a5
RESEARCH PRODUCT
B-K-parameter from N-f=2 twisted mass lattice QCD
M ConstantinouP DimopoulosR FrezzottiK JansenV GimenezV LubiczF MesciaH PanagopoulosM PapinuttoG RossiS SimulaA SkouroupathisF StylianouA Vladikassubject
K-antiK mixing; indirect CP violation; Lattice QCDHigh Energy Physics::LatticeHigh Energy Physics::Phenomenologyindirect CP violationFísicaK-antiK mixingLattice QCDSettore FIS/02 - Fisica Teorica Modelli e Metodi Matematicidescription
We present an unquenched N-f = 2 lattice computation of the B-K parameter which controls K-0 - (K) over bar (0) oscillations. A partially quenched setup is employed with two maximally twisted dynamical (sea) light Wilson quarks, and valence quarks of both the maximally twisted and the Osterwalder-Seiler variety. Suitable combinations of these two kinds of valence quarks lead to a lattice definition of the B-K parameter which is both multiplicatively renormalizable and O(a) improved. Employing the nonperturbative RI-MOM scheme, in the continuum limit and at the physical value of the pion mass we get B-K(RGI) = 0.729 +/- 0.030, a number well in line with the existing quenched and unquenched determinations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-01 |