An estimate of the K0-K0bar mixing amplitude | Zendy

Damir Bečirević | Zendy; Davide Meloni | Zendy; Alessandra Retico | Zendy

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An estimate of the K0-K0bar mixing amplitude

Author(s) -

Damir Bečirević,

Davide Meloni,

Alessandra Retico

Publication year - 2001

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2001/01/012

Subject(s) - quenched approximation , fermion , amplitude , physics , computation , mixing (physics) , lattice (music) , lattice constant , mathematical physics , statistical physics , quantum electrodynamics , quantum mechanics , condensed matter physics , particle physics , mathematics , algorithm , lattice qcd , quark , acoustics , diffraction

We computed the B_K parameter on the lattice by using a non-perturbativelyimproved Wilson action. From our quenched simulation, in the MSbar scheme andat mu=2 GeV, we obtain B_K=0.73(7)^{+0.05}_{-0.01}. To gain some insight in thesystematic errors due to the use of the quenched approximation, we also madethe unquenched computation with Wilson fermions. We do not observe anysignificant deviation with respect to the quenched result.Comment: 17 pages (LaTeX2e), 2 PostScript figures; version to appear in JHE

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