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BK-parameter from Nf=2 twisted mass lattice QCD
Department of Physics, University of Cyprus.
Dipartimento di Fisica, Sapienza, Università di Roma.
Dipartimento di Fisica, Università di Roma.
DESY.
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2011 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 83, no 1, article id 014505Article in journal (Refereed) Published
Abstract [en]

We present an unquenched Nf=2 lattice computation of the B K parameter which controls K0-K̄0 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 BK 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 BKRGI=0.729±0.030, a number well in line with the existing quenched and unquenched determinations.

Place, publisher, year, edition, pages
2011. Vol. 83, no 1, article id 014505
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Other Health Sciences
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Health Science
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URN: urn:nbn:se:ltu:diva-65219DOI: 10.1103/PhysRevD.83.014505Scopus ID: 2-s2.0-79551511472OAI: oai:DiVA.org:ltu-65219DiVA, id: diva2:1134637
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-11-29Bibliographically approved

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