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- W1596255655 abstract "We present preliminary results at {beta} = 1.95 (a = 0.077 fm) on the first unquenched N_f=2+1+1 lattice computation of the B_K parameter which controls the neutral kaon oscillations in the Standard Model. Using N_f=2+1+1 maximally twisted sea quarks and Osterwalder-Seiler valence quarks we achieve O(a) improvement and a continuum-like renormalization pattern for the four-fermion operator. Our results are extrapolated/interpolated to the physical light/strange quark mass but not yet to the continuum limit. The computation of the relevant renormalization constants is performed non perturbatively in the RI'-MOM scheme using dedicated simulations with N_f=4 degenerate sea quark flavours produced by the ETM collaboration. We get B_K^{RGI} (a = 0.077) = 0.747(18), which when compared to our previous unquenched N_f=2 determination and most of the existing results, suggests a rather weak B_K^{RGI} dependence on the number of dynamical flavours. We are at the moment analysing lattice data at two additional {beta} values which will allow us to perform an extrapolation to the continuum limit." @default.
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- W1596255655 date "2011-11-04" @default.
- W1596255655 modified "2023-09-26" @default.
- W1596255655 title "K^0-bar{K}^0 mixing in the Standard Model from Nf=2+1+1 Twisted Mass Lattice QCD" @default.
- W1596255655 doi "https://doi.org/10.48550/arxiv.1111.1262" @default.
- W1596255655 hasPublicationYear "2011" @default.
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