Sea quark effects in BKfrom Nf=2 clover-improved Wilson fermions | Zendy

J. M. Flynn | Zendy; Federico Mescia | Zendy; A. S. B. Tariq | Zendy

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Sea quark effects in B_Kfrom N_f=2 clover-improved Wilson fermions

Author(s) -

J. M. Flynn,

Federico Mescia,

A. S. B. Tariq

Publication year - 2004

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 - 10.1088/1126-6708/2004/11/049

Subject(s) - physics , particle physics , fermion , quark , unitarity , cabibbo–kobayashi–maskawa matrix , down quark , bottom quark , lattice (music) , top quark , acoustics

We report calculations of the parameter B_K appearing in the Delta S=2neutral kaon mixing matrix element, whose uncertainty limits the power ofunitarity triangle constraints for testing the standard model or looking fornew physics. We use two flavours of dynamical clover-improved Wilson latticefermions and look for dependence on the dynamical quark mass at fixed latticespacing. We see some evidence for dynamical quark effects and in particular B_Kdecreases as the sea quark masses are reduced towards the up/down quark mass.Comment: 17 pages, 4 figures, uses JHEP3.cls, added comments and reference

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