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K ->pi pi amplitudes from lattice QCD with a light charm quark

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K ->pi pi amplitudes from lattice QCD with a light charm quark

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Giusti, L.; Hernández Gamazo, Pilar; Laine, Mikko; Pena Ruano, Carlos; Wennekers, Jan; Wittig, Hartmut

This document is a artículoDate2007

Este documento está disponible también en : http://hdl.handle.net/10550/43338

We compute the leading-order low-energy constants of the DeltaS=1 effective weak Hamiltonian in the quenched approximation of QCD with up, down, strange, and charm quarks degenerate and light. They are extracted by comparing the predictions of finite volume chiral perturbation theory with lattice QCD computations of suitable correlation functions carried out with quark masses ranging from a few MeV up to half of the physical strange mass. We observe a large DeltaI=1/2 enhancement in this corner of the parameter space of the theory. Although matching with the experimental result is not observed for the DeltaI=1/2 amplitude, our computation suggests large QCD contributions to the physical DeltaI=1/2 rule in the GIM limit, and represents the first step to quantify the role of the charm quark-mass in K-->pipi amplitudes.

Giusti, L. Hernández Gamazo, Pilar Laine, Mikko Pena Ruano, Carlos Wennekers, Jan Wittig, Hartmut 2007 K ->pi pi amplitudes from lattice QCD with a light charm quark Physical Review Letters 98 8 082003-1 082003-4

http://dx.doi.org/10.1103/PhysRevLett.98.082003