arXiv:1012.3355·v1·High Energy Physics — Lattice
K^0-\bar{K}^0 Mixing Beyond the SM from Nf=2 tmQCD
ETM Collaboration: P. Dimopoulos🇮🇹 · R. Frezzotti🇮🇹 · V. Gimenez🇪🇸 · V. Lubicz🇮🇹 · G. Martinelli🇮🇹 · F. Mescia🇪🇸 · M. Papinutto🇫🇷 · G.C. Rossi🇮🇹 · S. Simula🇮🇹 · A. Vladikas🇮🇹
Abstract
We present preliminary results on the of neutral kaon oscillations in extensions of the Standard Model. Using Nf=2 maximally twisted sea quarks and Osterwalder-Seiler valence quarks, we achieve both O(a)-improvement and continuum-like renormalization pattern for the relevant four-fermion operators. We perform simulations at three values of the lattice spacing and extrapolate/interpolate our results to the continuum limit and physical light/strange quark mass. The calculation of the renormalization constants of the complete operator basis is performed non- perturbatively in the RI-MOM scheme.
Comments: 7 pages, 2 figures; presented at the XXVIII International Symposium on Lattice Field Theory Villasimius, Sardinia, Italy