BK-parameter from Nf=2 twisted mass lattice QCD
Ημερομηνία
2011Συγγραφέας
Constantinou, Martha G.![ORCID logo](https://orcid.org/sites/default/files/images/orcid_16x16.png)
Frezzotti, R.
Jansen, K.
Gimenez, V.
Lubicz, V.
Mescia, F.
![ORCID logo](https://orcid.org/sites/default/files/images/orcid_16x16.png)
Papinutto, M.
Rossi, G. C.
Simula, S.
Skouroupathis, A.
![ORCID logo](https://orcid.org/sites/default/files/images/orcid_16x16.png)
Vladikas, A.
ISSN
1550-7998Source
Physical Review D - Particles, Fields, Gravitation and CosmologyVolume
83Issue
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Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
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. © 2011 American Physical Society.