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A Light Scalar Explanation of $(g-2)_{\mu}$ and the KOTO Anomaly · Around

2020

A Light Scalar Explanation of $(g-2)_{\mu}$ and the KOTO Anomaly

Liu, Jia, McGinnis, Navin, Wagner, Carlos E. M. et al.

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The KOTO experiment has recently performed a search for neutral Kaons decaying into neutral pions and a pair of neutrinos.

Three events were observed in the KOTO signal region, with an expected background of about 0.05.
Since no clear signal of systematic errors have been found, the excess of events in the decay $K_{L}\rightarrow\pi^0\nu\bar{\nu}$ is quite intriguing.
One possibility to explain this anomaly would be the presence of a scalar $\phi$ with mass of the order of the pion mass and inducing decays $K_L \to \pi^0 \phi$ which mimic the observed signal.A scalar with mass of the order of the pion mass and a coupling to muons of the order of the Standard Model Higgs coupling could also explain the muon anomalous magnetic moment anomaly $(g-2)_{\mu}$.

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