We present unquenched lattice QCD results for the matrix elements of four-fermion operators relevant to the description of the neutral K and D mixing in the standard model and its extensions. We have employed simulations with N-f = 2 + 1 + 1 dynamical sea quarks at three values of the lattice spacings in the interval 0.06-0.09 fm and pseudoscalar meson masses in the range 210-450 MeV. Our results are extrapolated to the continuum limit and to the physical pion mass. Renormalization constants have been determined nonperturbatively in the RI-MOM scheme. In particular, for the kaon bag parameter, which is relevant for the (K) over bar (0) - K-0 mixing in the standard model, we obtain B-K(RGI) = 0.717(24).
Carrasco, N., Dimopoulos, P., Frezzotti, R., Lubicz, V., Rossi, G. ., Simula, S., et al. (2015). ΔS=2 and ΔC=2bag parameters in the standard model and beyond from Nf=2+1+1twisted-mass lattice QCD. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 92(3) [10.1103/PhysRevD.92.034516].
ΔS=2 and ΔC=2bag parameters in the standard model and beyond from Nf=2+1+1twisted-mass lattice QCD
Frezzotti, R.
;
2015-01-01
Abstract
We present unquenched lattice QCD results for the matrix elements of four-fermion operators relevant to the description of the neutral K and D mixing in the standard model and its extensions. We have employed simulations with N-f = 2 + 1 + 1 dynamical sea quarks at three values of the lattice spacings in the interval 0.06-0.09 fm and pseudoscalar meson masses in the range 210-450 MeV. Our results are extrapolated to the continuum limit and to the physical pion mass. Renormalization constants have been determined nonperturbatively in the RI-MOM scheme. In particular, for the kaon bag parameter, which is relevant for the (K) over bar (0) - K-0 mixing in the standard model, we obtain B-K(RGI) = 0.717(24).File | Dimensione | Formato | |
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