Neutral kaon mixing beyond the standard model with nf=2+1 chiral fermions

Abstract

We compute the hadronic matrix elements of the four-quark operators needed for the study of neutral kaon mixing beyond the Standard Model (SM). We use nf=2+1 flavours of domain-wall fermions (DWF) which exhibit good chiral-flavour symmetry. The renormalization is performed non-perturbatively through the RI-MOM scheme and our results are converted perturbatively to MSbar. The computation is performed on a single lattice spacing a=0.086 fm with a lightest unitary pion mass of 290 MeV. The various systematic errors, including the discretisation effects, are estimated and discussed. Our results confirm a previous quenched study, where large ratios of non-SM to SM matrix elements were obtained.

5 pages, 4 figures, 1 table. v2 paper version, R3 and B3 corrected, conversion to 2GeV added, references added

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• Continuum Limit Physics from 2+1 Flavor Domain Wall QCD
• Non-perturbative renormalization of quark bilinear operators and B_K using domain wall fermions
• Continuum Limit of $B_K$ from 2+1 Flavor Domain Wall QCD
• K^0-\bar K^0 mixing beyond the standard model and CP-violating electroweak penguins in quenched QCD with exact chiral symmetry
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Cited by in corpus (9)

• Present and Future K and B Meson Mixing Constraints on TeV Scale Left-Right Symmetry
• Neutral Kaon Mixing Beyond the Standard Model with $n_f=2+1$ Chiral Fermions Part 1: Bare Matrix Elements and Physical Results
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• Neutral kaon mixing beyond the Standard Model with nf=2+1 chiral fermions part II: Non Perturbative Renormalisation of the $\Delta F=2$ four-quark operators
• Beyond the Standard Model corrections to $K^0-{\bar{K}}^0$ mixing
• Toolkit for staggered $\Delta S=2$ matrix elements
• Beyond the Standard Model Kaon Mixing with Physical Masses
• Chiral extrapolation of matrix elements of BSM kaon operators
• Recent Progress in Lattice QCD