We present the first Nf=2+1+1 results for the matrix elements of the operators describing neutral K and D mixing in the Standard Model and its extensions. The combination of maximally twisted sea quarks and Osterwalder-Seiler valence quarks ensures O(a)-improvement and continuum like renormalization pattern. We have used the Nf=2+1+1 dynamical quark gauge configurations generated by ETMC. Simulations include three lattice spacings in the interval [0.06:0.09] fm and pseudoscalar meson masses in the range [230:500] MeV. Our results are extrapolated to the continuum limit and to the physical quark masses. The calculation of the renormalization constants has been performed non-perturbatively in the RI-MOM scheme.
Carrasco, N., Dimopoulos, P., Frezzotti, R., Giménez, V., Lubicz, V., Rossi G., C., et al. (2014). K and D oscillations in the Standard Model and its extensions from Nf=2+1+1 Twisted Mass LQCD. In PoS LATTICE 2013 (pp.393).