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\Delta S=2 and \Delta C=2 bag parameters in the SM and beyond from Nf=2+1+1 twisted-mass LQCD

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arxiv 1505.06639 v2 pith:DXDPKRRW submitted 2015-05-25 hep-lat hep-ph

N. Carrasco , P. Dimopoulos , R. Frezzotti , V. Lubicz , G.C Rossi , S. Simula , C. Tarantino (for the ETM Collaboration) This is my paper · ORCID
classification hep-lathep-ph
keywords deltalatticemixingmodelrelevantresultsstandardbag-parameter
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We present unquenched lattice QCD results for the matrix elements of four-fermion operators relevant to the description of the neutral K and D mixing in the Standard Model and its extensions. We have employed simulations with Nf = 2 + 1 + 1 dynamical sea quarks at three values of the lattice spacings in the interval 0.06 - 0.09 fm and pseudoscalar meson masses in the range 210 - 450 MeV. Our results are extrapolated to the continuum limit and to the physical pion mass. Renormalization constants have been determined non-perturbatively in the RI-MOM scheme. In particular, for the Kaon bag-parameter, which is relevant for the \overline{K}^0-K^0 mixing in the Standard Model, we obtain B_K^{RGI} = 0.717(24).

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