Neutral kaon mixing beyond the Standard Model with n<sub>f</sub>=2+1 chiral fermions. Part 1: bare matrix elements and physical results



Garron, Nicolas ORCID: 0000-0002-4428-3984, Hudspith, Renwick J and Lytle, Andrew T
(2016) Neutral kaon mixing beyond the Standard Model with n<sub>f</sub>=2+1 chiral fermions. Part 1: bare matrix elements and physical results. JOURNAL OF HIGH ENERGY PHYSICS, 2016 (11). 1-.

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Abstract

We compute the hadronic matrix elements of the four-quark operators relevant for K0− K¯ 0 mixing beyond the Standard Model. Our results are from lattice QCD simulations with nf = 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.

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, CP violation, Kaon Physics, Lattice QCD
Depositing User: Symplectic Admin
Date Deposited: 17 Oct 2016 09:29
Last Modified: 15 Mar 2024 12:57
DOI: 10.1007/JHEP11(2016)001
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003785