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Search for an invisibly decaying Z^(prime) boson at Belle II in e^+ e^- to μ^+ μ^- (e^(pm) μ^(mp)) plus missing energy final states
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arxiv 1912.11276 v2 pith:L6XA4MQ7 submitted 2019-12-24 hep-ex
Search for an invisibly decaying Z^(prime) boson at Belle II in e^+ e^- to μ^+ μ^- (e^(pm) μ^(mp)) plus missing energy final states
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Theories beyond the standard model often predict the existence of an additional neutral boson, the $Z^{\prime}$. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a $Z^{\prime}$ in the process $e^+ e^- \to \mu^+ \mu^- Z^{\prime}$ and of a lepton-flavor-violating $Z^{\prime}$ in $e^+ e^- \to e^{\pm} \mu^{\mp} Z^{\prime}$. We do not find any excess of events and set 90\% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an $L_{\mu}-L_{\tau}$ theory, into upper limits on the $Z^{\prime}$ coupling constant at the level of $5 \times 10^{-2}$ -- $1$ $M_{Z^\prime}\leq 6$ GeV/$c^2$.
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