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Nonleptonic $K\to 2\,\pi$ decay dynamics

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arxiv 2012.09483 v1 pith:4YOQTNXC submitted 2020-12-17 hep-ph hep-exhep-lat

classification hep-phhep-exhep-lat
keywords dynamicsleftnonleptonicrightvarepsilonaccountagreementaverage
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Using Chiral Perturbation Theory to properly account for the dynamics of nonleptonic $K\to 2\,\pi$ decays, we found the Standard Model prediction for the CP violating ratio $\mbox{Re}\left(\varepsilon'/\varepsilon\right)=\left(14\pm 5\right) \times 10^{-4}$, where isospin breaking effects are included, in perfect agreement with the current experimental world average. Similar results have been reported by a recent release of improved lattice data.

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  1. Prospects for $K_{L}\to\pi^{0}\nu\bar{\nu}$, $K_S\to\mu^+\mu^-$, $K_L\to\pi^0 \ell^+\ell^-$ and $\varepsilon^{\prime}/\varepsilon$ after the new $K^{+}\to\pi^{+}\nu\bar{\nu}$ result from NA62

    hep-ph 2026-07 conditional novelty 5.0 of 10

    A Z' model with both left- and right-handed sbar-d couplings can enhance K_L→π0ννbar by an order of magnitude while keeping K+→π+ννbar and ε_K SM-like.

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