K-Kbar, D-Dbar and B-Bbar oscillations from Lattice QCD

by Ms Nuria Carrasco-Vela (phd)

Thursday 20 Dec 2012, 14:30 → 15:30 Europe/Rome

C (Roma Tre)

Flavour Changing Neutral Currents (FCNC) and CP violation may provide relevant information on the impact of beyond the Standard Model (BSM). The lattice computation of the relevant matrix elements appearing in K-Kbar and B-Bbar mixing in combination with the experimental value of epsilon_K, Delta M_{Bd} and Delta M_{Bs} offers the opportunity to constrain the BSM model parameters. In contrast, D-Dbar, at variance with K-Kbar and B-Bbar mixing, involves up-type quarks so it is sensitive to a different sector of NP. In this seminar I will motivate phenomenologically the computation on the lattice of the bag parameters controlling the neutral meson mixing. Since discretization errors on current lattices are expected to be large at the physical value of b-quark mass, our strategy in the B-sector is based on the ratio method approach which will also be discussed.