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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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dc.contributor.author	Constantinou, M.
dc.contributor.author	Dimopoulos, P.
dc.contributor.author	Frezzotti, R.
dc.contributor.author	Jansen, K.
dc.contributor.author	Giménez Gómez, Vicente
dc.contributor.author	Lubicz, V.
dc.contributor.author	Mescia, Federico
dc.contributor.author	Panagopoulos, H.
dc.contributor.author	Papinutto, Mauro
dc.contributor.author	Rossi, G.C.
dc.contributor.author	Simula, S.
dc.contributor.author	Skouroupathis, A.
dc.contributor.author	Stylianou, F.
dc.contributor.author	Vladikas, A.
dc.date.accessioned	2014-09-24T12:24:39Z
dc.date.available	2014-09-24T12:24:39Z
dc.date.issued	2011
dc.identifier.citation	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
dc.identifier.uri	http://hdl.handle.net/10550/38961
dc.description.abstract	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.
dc.language.iso	eng
dc.relation.ispartof	Physical Review D, 2011, vol. 83, num. 1, p. 014505
dc.subject	Física
dc.title	B-K-parameter from N-f=2 twisted mass lattice QCD
dc.type	journal article	es_ES
dc.date.updated	2014-09-24T12:24:39Z
dc.identifier.doi	10.1103/PhysRevD.83.014505
dc.identifier.idgrec	070772
dc.rights.accessRights	open access	es_ES