Violations of Dashen's Theorem
Abstract
The electromagnetic contribution to the K+ - K0 mass difference is calculated in the 1/Nc approach including the SU(3) breaking contributions due to a non-zero strange quark mass. The short-distance contribution can be unambiguously determined in terms of the known parameters of the next-to-leading order chiral lagrangian. The long distance part is estimated using the 1/Nc approach by Bardeen et al. Relatively large corrections are found.
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