BK-parameter from Nf = 2 twisted mass lattice QCD

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RECERCAT Home > Universitat de Barcelona > Física Quàntica i Astrofísica > Articles publicats en revistes (Física Quàntica i Astrofísica) > View document

To access the full text documents, please follow this link: http://hdl.handle.net/2445/131795

dc.contributor	Universitat de Barcelona
dc.contributor.author	Constantinou, M.
dc.contributor.author	Dimopoulos, P.
dc.contributor.author	Frezzotti, R.
dc.contributor.author	Jansen, K.
dc.contributor.author	Gimenez, V.
dc.contributor.author	Lubicz, V.
dc.contributor.author	Mescia, Federico
dc.contributor.author	Panagopoulos, H.
dc.contributor.author	Papinutto, M.
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.contributor.author	ETM Collaboration
dc.date	2019-04-08T12:11:20Z
dc.date	2019-04-08T12:11:20Z
dc.date	2011-01-01
dc.date	2019-04-08T12:11:20Z
dc.identifier.citation	1550-7998
dc.identifier.citation	623813
dc.identifier.uri	http://hdl.handle.net/2445/131795
dc.format	20 p.
dc.format	application/pdf
dc.language.iso	eng
dc.publisher	American Physical Society
dc.relation	Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.83.014505
dc.relation	Physical Review D, 2011, vol. 83, num. 1, p. 014505
dc.relation	https://doi.org/10.1103/PhysRevD.83.014505
dc.rights	(c) American Physical Society, 2011
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Física de partícules
dc.subject	Experiments
dc.subject	Particle physics
dc.subject	Experiments
dc.title	BK-parameter from Nf = 2 twisted mass lattice QCD
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion
dc.description.abstract	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.

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