Determination of the Delta S=1 weak Hamiltonian in the SU(4) chiral limit through topological zero-mode wave functions
Hernandez, P.
Laine, Mikko
Pena, C.
Torro, E.
Wennekers, J.
Wittig, H.
weak decays
kaon physics
lattice QCD
A new method to determine the low-energy couplings of the Delta S = 1 weak Hamiltonian is presented. It relies on a matching of the topological poles in 1/m(2) of three-point correlators of two pseudoscalar densities and a four-fermion operator, measured in lattice QCD, to the same observables computed in the is an element of-regime of chiral perturbation theory. We test this method in a theory with a light charm quark, i.e. with an SU(4) flavour symmetry. Quenched numerical measurements are performed in a 2 fm box, and chiral perturbation theory predictions are worked out up to next-to-leading order. The matching of the two sides allows to determine the weak low-energy couplings in the SU( 4) limit. We compare the results with a previous determination, based on three-point correlators containing two left-handed currents, and discuss the merits and drawbacks of the two procedures.
2008
info:eu-repo/semantics/article
doc-type:article
text
https://pub.uni-bielefeld.de/record/1587375
Hernandez P, Laine M, Pena C, Torro E, Wennekers J, Wittig H. Determination of the Delta S=1 weak Hamiltonian in the SU(4) chiral limit through topological zero-mode wave functions. <em>Journal of High Energy Physics</em>. 2008;2008(05):043.
eng
info:eu-repo/semantics/altIdentifier/doi/10.1088/1126-6708/2008/05/043
info:eu-repo/semantics/altIdentifier/issn/1126-6708
info:eu-repo/semantics/altIdentifier/issn/1029-8479
info:eu-repo/semantics/altIdentifier/wos/000256664400043
info:eu-repo/semantics/closedAccess