D-Dbar Mixing in the Standard Model and Beyond from Nf=2 Twisted Mass QCD

Abstract

We present the first unquenched lattice QCD results for the bag parameters controlling the short distance contribution to D meson oscillations in the Standard Model and beyond. We have used the gauge configurations produced by the European Twisted Mass Collaboration with Nf = 2 dynamical quarks, at four lattice spacings and light meson masses in the range 280-500 MeV. Renormalization is carried out non-perturbatively with the RI-MOM method. The bag-parameter results have been used to constrain New Physics effects in D-Dbar mixing, to put a lower bound to the generic New Physics scale and to constrain off-diagonal squark mass terms for TeV-scale Supersymmetry.

Comments: 18 pages, 4 figures, 10 tables, updated to match the version accepted for publication in Physical Review D. This article draws form arXiv:1308.1851 which is on B-Bbar mixing instead of D-Dbar mixing