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

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

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