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• W2019003610 abstract "The π+−π0 mass difference generated by the electroweak interactions of the Standard Model is expressed, to lowest order in the chiral expansion and to leading order in α, in terms of an integral involving the same correlation function ΠLR(Q2) which governs the well known electromagnetic π+−π0 mass difference. We calculate this contribution within the framework of QCD in the limit of a large number of colours Nc. We show how this calculation, which requires non-trivial contributions from next-to-leading terms in the 1/Nc expansion, provides an excellent theoretical laboratory for studying issues of long- and short-distance matching in calculations of weak matrix elements of four-quark operators. The electroweak π+−π0 mass difference turns out to be a physical observable which is under good analytical control and which should, therefore, be an excellent testground of numerical evaluations in lattice-QCD and of model calculations in general." @default.
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• W2019003610 date "1998-12-01" @default.
• W2019003610 modified "2023-10-09" @default.
• W2019003610 title "The electroweak π+−π0 mass difference and weak matrix elements in the 1/Nc expansion" @default.
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• W2019003610 doi "https://doi.org/10.1016/s0370-2693(98)01344-6" @default.
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