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- W3105225414 abstract "Suppose that the weak interaction hamiltonian of four-flavour SU(4) chiral effective theory is known, for a small charm quark mass mc. We study how the weak hamiltonian changes as the charm quark mass increases, by integrating it out within chiral perturbation theory to obtain a three-flavour SU(3) chiral theory. We find that the ratio of the SU(3) low-energy constants which mediate ΔI = 1/2 and ΔI = 3/2 transitions, increases rather rapidly with mc, as ∼ mcln (1/mc). The logarithmic effect originates from ``penguin-type'' charm loops, and could represent one of the reasons for the ΔI = 1/2 rule." @default.
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- W3105225414 date "2004-09-10" @default.
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- W3105225414 title "Charm mass dependence of the weak Hamiltonian in chiral perturbation theory" @default.
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- W3105225414 doi "https://doi.org/10.1088/1126-6708/2004/09/018" @default.
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