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.
@article{arxiv.1403.7302,
title = {D-Dbar Mixing in the Standard Model and Beyond from Nf=2 Twisted Mass QCD},
author = {N. Carrasco and M. Ciuchini and P. Dimopoulos and R. Frezzotti and V. Gimenez and V. Lubicz and G. C. Rossi and F. Sanfilippo and L. Silvestrini and S. Simula and C. Tarantino},
journal= {arXiv preprint arXiv:1403.7302},
year = {2014}
}
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