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      Search for an invisibly decaying \(Z^{\prime}\) boson at Belle II in \(e^+ e^- \to \mu^+ \mu^- (e^{\pm} \mu^{\mp})\) plus missing energy final states

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          Abstract

          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 \(5 \times 10^{-2}\div1\) for \(M_{Z^\prime}\leq 6\) GeV/\(c^2\).

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          Author and article information

          Journal
          24 December 2019
          Article
          1912.11276
          8a5146d8-c425-4358-aa15-44177f2f11a2

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
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          9 pages, 5 figures + supplemental materials. Submitted to Physics Review Letters
          hep-ex

          High energy & Particle physics
          High energy & Particle physics

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