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Neutral kaon mixing beyond the Standard Model with nf = 2 + 1 chiral fermions. Part 1: bare matrix elements and physical results

  • The RBC/UKQCD collaboration
  • Nicolas GarronEmail author
  • Renwick J. Hudspith
  • Andrew T. Lytle
Open Access
Regular Article - Theoretical Physics

Abstract

We compute the hadronic matrix elements of the four-quark operators relevant for \( {K}^0-{\overline{K}}^0 \) mixing beyond the Standard Model. Our results are from lattice QCD simulations with n f = 2 + 1 flavours of domain-wall fermion, which exhibit continuum-like chiral-flavour symmetry. The simulations are performed at two different values of the lattice spacing (a ∼ 0.08 and a ∼ 0.11 fm) and with lightest unitary pion mass ∼ 300 MeV. For the first time, the full set of relevant four-quark operators is renormalised non-perturbatively through RI-SMOM schemes; a detailed description of the renormalisation procedure is presented in a companion paper. We argue that the intermediate renormalisation scheme is responsible for the discrepancies found by different collaborations. We also study different normalisations and determine the matrix elements of the relevant four-quark operators with a precision of ∼ 5% or better.

Keywords

Beyond Standard Model CP violation Kaon Physics Lattice QCD 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2016

Authors and Affiliations

  • The RBC/UKQCD collaboration
  • Nicolas Garron
    • 1
    Email author
  • Renwick J. Hudspith
    • 2
  • Andrew T. Lytle
    • 3
  1. 1.Theoretical Physics Division, Department of Mathematical SciencesUniversity of LiverpoolLiverpoolU.K.
  2. 2.Department of Physics and AstronomyYork UniversityTorontoCanada
  3. 3.SUPA, School of Physics and AstronomyUniversity of GlasgowGlasgowU.K.

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