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- W2612105568 abstract "If dark photons are massless, they couple to standard-model particles only via higher dimensional operators, while the kinetic mixing with photons, which motivates most of the current experimental searches, is absent. We consider the effect of possible flavor-changing magnetic-dipole couplings of massless dark photons in kaon physics. In particular, we study the branching ratio for the process $K^+rightarrow pi^+pi^0 bar gamma$ with a simplified-model approach, assuming the chiral quark model to evaluate the hadronic matrix element. Possible effects in the $K^0$-$bar K^0$ mixing are taken into account. We find that branching ratios up to $O(10^{-7})$ are allowed---depending on the dark-sector masses and couplings. Such large branching ratios for $K^+rightarrow pi^+pi^0 bar gamma$ could be of interest for experiments dedicated to rare $K^+$ decays like NA62 at CERN, where $bar gamma$ can be detected as a massless invisible system." @default.
- W2612105568 created "2017-05-19" @default.
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- W2612105568 date "2017-07-21" @default.
- W2612105568 modified "2023-09-27" @default.
- W2612105568 title "Hunting Down Massless Dark Photons in Kaon Physics" @default.
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- W2612105568 doi "https://doi.org/10.1103/physrevlett.119.031801" @default.
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