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Search for an invisible $Z^\prime$ in a final state with two muons and missing energy at Belle II
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arxiv 2212.03066 v3 pith:MJSPOYW6 submitted 2022-12-06 hep-ex
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abstract
The $L_{\mu}-L_{\tau}$ extension of the standard model predicts the existence of a lepton-flavor-universality-violating $Z^{\prime}$ boson that couples only to the heavier lepton families. We search for such a $Z^\prime$ through its invisible decay in the process $e^+ e^- \to \mu^+ \mu^- Z^{\prime}$. We use a sample of electron-positron collisions at a center-of-mass energy of 10.58GeV collected by the Belle II experiment in 2019-2020, corresponding to an integrated luminosity of 79.7fb$^{-1}$. We find no excess over the expected standard-model background. We set 90$\%$-confidence-level upper limits on the cross section for this process as well as on the coupling of the model, which ranges from $3 \times 10^{-3}$ at low $Z^{\prime}$ masses to 1 at $Z^{\prime}$ masses of 8$GeV/c^{2}$.
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Cited by 2 Pith papers
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One-loop corrections to W/Z/h leptonic widths exclude heavy leptophilic Z' regions (M ≳ O(1) TeV, g' ≳ 0.4) beyond LEP-2 and neutrino-trident limits.
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Invisible decays of vector Charmonia and Bottomonia to determine the Weak Mixing Angle at quarkonia scale
hep-ph 2024-11 conditional novelty 4.0 of 10
The invisible branching fractions of J/psi, psi(2S), and Upsilon(nS) to neutrino pairs are predicted at the 10^-8 to 10^-5 level, offering a way to measure the weak mixing angle at quarkonia mass scales.
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