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oai:recercat.cat:2445/1317952025-12-05T16:48:59Zcom_2072_1057col_2072_478823col_2072_478917

urn:hdl:2445/131795 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 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 American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)