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

Abstract

We report calculations of the parameter B_K appearing in the Delta S=2 neutral kaon mixing matrix element, whose uncertainty limits the power of unitarity triangle constraints for testing the standard model or looking for new physics. We use two flavours of dynamical clover-improved Wilson lattice fermions and look for dependence on the dynamical quark mass at fixed lattice spacing. We see some evidence for dynamical quark effects and in particular B_K decreases as the sea quark masses are reduced towards the up/down quark mass.

17 pages, 4 figures, uses JHEP3.cls, added comments and references

References in corpus (6)

• Chirally improving Wilson fermions - I. O(a) improvement
• Impact of the finite volume effects on the chiral behavior of fK and BK
• B_K from quenched QCD with exact chiral symmetry
• Large cutoff effects of dynamical Wilson fermions
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Cited by in corpus (10)

• FLAG Review 2019
• Review of lattice results concerning low energy particle physics
• B, D and K decays
• Lattice QCD with two dynamical flavors of domain wall quarks
• Four-point functions and kaon decays in a minimal AdS/QCD model
• $B_K$ using HYP-smeared staggered fermions in $N_f=2+1$ unquenched QCD
• Unquenched determination of the kaon parameter B_K from improved staggered fermions
• Natural SUSY and Kaon Mixing in view of recent results from Lattice QCD
• B_K with two flavors of dynamical overlap fermions
• K0-K0bar on the Lattice