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

K^0-\bar{K}^0 Mixing Beyond the SM from Nf=2 tmQCD

High Energy Physics - Lattice 2010-12-16 v1 High Energy Physics - Phenomenology

Authors: ETM Collaboration , P. Dimopoulos , R. Frezzotti , V. Gimenez , V. Lubicz , G. Martinelli , F. Mescia , M. Papinutto , G. C. Rossi , S. Simula , A. Vladikas

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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.

Keywords

kaon mixing beyond standard model lattice QCD twisted mass four-fermion operators non-perturbative renormalization

Cite

@article{arxiv.1012.3355,
  title  = {K^0-\bar{K}^0 Mixing Beyond the SM from Nf=2 tmQCD},
  author = {ETM Collaboration and P. Dimopoulos and R. Frezzotti and V. Gimenez and V. Lubicz and G. Martinelli and F. Mescia and M. Papinutto and G. C. Rossi and S. Simula and A. Vladikas},
  journal= {arXiv preprint arXiv:1012.3355},
  year   = {2010}
}

Comments

7 pages, 2 figures; presented at the XXVIII International Symposium on Lattice Field Theory Villasimius, Sardinia, Italy

K^0-\bar{K}^0 Mixing Beyond the SM from Nf=2 tmQCD

Abstract

Keywords

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