| HAL : in2p3-00524186, version 1 |
| arXiv : 1009.5606 |
| DOI : 10.1103/PhysRevD.83.014505 |
| Fiche détaillée | Récupérer au format |
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| Physical Review D 83 (2011) 014505 |
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| BK-parameter from Nf = 2 twisted mass lattice QCD |
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| M. ConstantinouP. DimopoulosR. FrezzottiK. Jansen1V. GimenezV. LubiczF. MesciaH. PanagopoulosM. Papinutto2G.C. RossiS. SimulaA. SkouroupathisF. StylianouA. Vladikas |
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| ETM Collaboration(s) |
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| (2011) |
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| We present an unquenched $N_f=2$ lattice computation of the $B_{K}$ parameter which controls $K^0-\bar K^0$ 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 non-perturbative RI-MOM scheme, in the continuum limit and at the physical value of the pion mass we get $B^{\rm RGI}_K=0.729\pm 0.030$, a number well in line with the existing quenched and unquenched determinations. |
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| 1 : | DESY - Deutsches Elektronen-Synchrotron |
| 2 : | LPSC - Laboratoire de Physique Subatomique et de Cosmologie |
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| Thème(s) | : | Physique/Physique des Hautes Energies - Réseau Physique/Physique des Hautes Energies - Phénoménologie |
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| Lien vers le texte intégral : |
| in2p3-00524186, version 1 | |
| http://hal.in2p3.fr/in2p3-00524186 | |
| oai:hal.in2p3.fr:in2p3-00524186 | |
| Contributeur : Emmanuelle Vernay | |
| Soumis le : Jeudi 7 Octobre 2010, 10:57:30 | |
| Dernière modification le : Mercredi 12 Janvier 2011, 09:19:18 | |