Search Capability for $\eta \to \nu_{e,{\tau}}\bar\nu_{e,{\tau}}$ Decays in Cubic Kilometer Neutrino Detectors

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Authors
Fazely, A. R.
Gunasingha, R. M.
Imlay, R. L.
Muhammad, K. D.
Ter-Antonyan, S. V.
Xu, X.
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Abstract
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We investigate the discovery potential of cubic kilometer neutrino observatories such as IceCube to set stringent limits on the forbidden decays $\eta\to\nu_e\bar\nu_e$ and $\eta\to\nu_{\tau}\bar\nu_{\tau}$. The signatures for these decays are cascade events resulting from the charged-current reactions of $\nu_e, \nu_{\tau}$, $\bar\nu_e$ and $\bar\nu_{\tau}$ on nuclei in such detectors. Background cascade events are mainly due to $\nu_e$'s from atmospheric $\mu$, $K^+$, and $K^{0}_S$ decays and to a lesser extent from atmospheric $\nu_{\mu}$ neutral current interactions with nuclei. A direct upper limit for the branching ratio $\eta \to \nu_{e,\tau} \bar\nu_{e,\tau}$ of $4.5\times10^{-4}$ at 90% CL can be achieved.
Comment: Typos were fixed.
Keywords
High Energy Physics - Experiment
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