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B-K-parameter from N-f=2 twisted mass lattice QCD

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B-K-parameter from N-f=2 twisted mass lattice QCD

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Constantinou, M.; Dimopoulos, P.; Frezzotti, R.; Jansen, K.; Giménez Gómez, Vicente; Lubicz, V.; Mescia, Federico; Panagopoulos, H.; Papinutto, Mauro; Rossi, G.C.; Simula, S.; Skouroupathis, A.; Stylianou, F.; Vladikas, A.

This document is a artículoDate2011

Este documento está disponible también en : http://hdl.handle.net/10550/38961

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.

Constantinou, M. Dimopoulos, P. Frezzotti, R. Jansen, K. Giménez Gómez, Vicente Lubicz, V. Mescia, Federico Panagopoulos, H. Papinutto, Mauro Rossi, G.C. Simula, S. Skouroupathis, A. Stylianou, F. Vladikas, A. 2011 B-K-parameter from N-f=2 twisted mass lattice QCD Physical Review D 83 1 014505

http://dx.doi.org/10.1103/PhysRevD.83.014505