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Title:
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BK-parameter from Nf = 2 twisted mass lattice QCD
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Author:
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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
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Other authors:
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Universitat de Barcelona |
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Abstract:
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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. |
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Subject(s):
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-Física de partícules
-Experiments
-Particle physics
-Experiments |
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Rights:
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(c) American Physical Society, 2011
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Document type:
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Article
Article - Published version |
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Published by:
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American Physical Society
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