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Título: | K -> π π amplitudes from lattice QCD with a light charm quark |
Autor: | Giusti, Leonardo; Hernández Gamazo, Pilar CSIC ORCID; Laine, M.; Pena, Carlos Roberto CSIC ORCID; Wennekers, J.; Wittig, H. | Palabras clave: | Chiral perturbation theory To-leading order Weak interactions Wilson fermions [PACS] Lattice QCD calculations [PACS] Hadronic decays of K mesons [PACS] Chiral symmetries in particles and fields |
Fecha de publicación: | 23-feb-2007 | Editor: | American Physical Society | Citación: | Physical Review Letters 98: 082003 (2007) | Serie: | IFIC/06-17 | Resumen: | We compute the leading-order low-energy constants of the ΔS=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 ΔI = 1/2 enhancement in this corner of the parameter space of the theory. Although matching with the experimental result is not observed for the Δ = 1/2 amplitude, our computation suggests large QCD contributions to the physical ΔI = 1/2 rule in the GIM limit, and represents the first step to quantify the role of the charm-quark mass in K -> π π amplitudes. The use of fermions with an exact chiral symmetry is an essential ingredient in our computation. | Descripción: | 4 pages, 1 figure.-- PACS nrs.: 12.38.Gc, 13.25.Es, 11.30.Rd.-- ISI Article Identifier: 000244420700019.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0607220 | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.98.082003 | URI: | http://hdl.handle.net/10261/9153 | DOI: | 10.1103/PhysRevLett.98.082003 | ISSN: | 0031-9007 |
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