2026-04-18T02:15:36Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1317952025-12-05T16:48:59Zcom_2072_1057col_2072_478823col_2072_478917
BK-parameter from Nf = 2 twisted mass lattice QCD
Constantinou, M.
Dimopoulos, P.
Frezzotti, R.
Jansen, K.
Gimenez, V.
Lubicz, V.
Mescia, Federico
Panagopoulos, H.
Papinutto, M.
Rossi, G. C.
Simula, S.
Skouroupathis, A.
Stylianou, F.
Vladikas, A.
ETM Collaboration
Física de partícules
Experiments
Particle physics
Experiments
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.
2019-04-08T12:11:20Z
2019-04-08T12:11:20Z
2011-01-01
2019-04-08T12:11:20Z
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
1550-7998
https://hdl.handle.net/2445/131795
623813
eng
Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.83.014505
Physical Review D, 2011, vol. 83, num. 1, p. 014505
https://doi.org/10.1103/PhysRevD.83.014505
info:eu-repo/grantAgreement/EC/FP7/249309/EU//HPLQCD
(c) American Physical Society, 2011
info:eu-repo/semantics/openAccess
20 p.
application/pdf
American Physical Society
Articles publicats en revistes (Física Quàntica i Astrofísica)