K → ππ matrix elements from mixed action lattice QCD

John W Laiho, Ruth S. Van De Water

Research output: Contribution to journalConference article

Abstract

We present a new method for determining K → ππ matrix elements from lattice simulations that is less costly than direct simulations of K → ππ at physical kinematics. It improves, however, upon the traditional “indirect” approach of constructing the K → ππ matrix elements using NLO SU(3) χPT, which can lead to large higher-order chiral corrections. Using the explicit example of the ∆I = 3/2 (27,1) operator to illustrate the method, we obtain a value for Re(A2) that agrees with experiment and has a total uncertainty of < 20%. Although our simulations use domain-wall valence quarks on the MILC asqtad-improved gauge configurations, this method is more general and can be applied to calculations with any fermion formulation.

Original languageEnglish (US)
JournalProceedings of Science
Volume105
StatePublished - Jan 1 2010
Externally publishedYes
Event28th International Symposium on Lattice Field Theory, Lattice 2010 - Villasimius, Sardinia, Italy
Duration: Jun 14 2010Jun 19 2010

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ASJC Scopus subject areas

  • General

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