%0 Journal Article
%T B-K-parameter from N-f=2 twisted mass lattice QCD
%A Constantinou, M.
%A Dimopoulos, P.
%A Frezzotti, R.
%A Jansen, K.
%A Gimenez, V.
%A Lubicz, V.
%A Mescia, F.
%A Panagopoulos, H.
%A Papinutto, M.
%A Rossi, G. C.
%A Simula, S.
%A Skouroupathis, A.
%A Stylianou, F.
%A Vladikas, A.
%J Physical Review D
%D 2011
%V 83
%N 1
%I Amer Physical Soc
%@ 1550-7998
%G English
%F Constantinou_etal2011
%O ISI:000286761700002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=576), last updated on Wed, 13 Apr 2011 10:30:16 +0000
%X We present an unquenched N-f = 2 lattice computation of the B-K parameter which controls K-0 – (K) over bar (0) oscillations. A partially quenched setup is employed with two maximally twisted dynamical (sea) light Wilson quarks, and valence quarks of both the maximally twisted and the Osterwalder-Seiler variety. Suitable combinations of these two kinds of valence quarks lead to a lattice definition of the B-K parameter which is both multiplicatively renormalizable and O(a) improved. Employing the nonperturbative RI-MOM scheme, in the continuum limit and at the physical value of the pion mass we get B-K(RGI) = 0.729 +/- 0.030, a number well in line with the existing quenched and unquenched determinations.
%R 10.1103/PhysRevD.83.014505
%U http://arxiv.org/abs/arXiv:1009.5606
%U https://doi.org/10.1103/PhysRevD.83.014505
%P 014505-20pp