2026-04-17T06:06:32Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1317952025-12-05T16:48:59Zcom_2072_1057col_2072_478823col_2072_478917
RECERCAT
author
Constantinou, M.
author
Dimopoulos, P.
author
Frezzotti, R.
author
Jansen, K.
author
Gimenez, V.
author
Lubicz, V.
author
Mescia, Federico
author
Panagopoulos, H.
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Papinutto, M.
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Rossi, G. C.
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Simula, S.
author
Skouroupathis, A.
author
Stylianou, F.
author
Vladikas, A.
author
ETM Collaboration
2019-04-08T12:11:20Z2019-04-08T12:11:20Z2011-01-012019-04-08T12:11:20Z
We present an unquenched N f = 2 lattice computation of the B K parameter which controls K 0 − ¯¯¯¯ K 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 RGI K = 0.729 ± 0.030 , a number well in line with the existing quenched and unquenched determinations.
(c) American Physical Society, 2011 info:eu-repo/semantics/openAccess
Física de partícules
Experiments
Particle physics
Experiments
BK-parameter from Nf = 2 twisted mass lattice QCD
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion