Search for $Z^{{}^{\prime }}\to {\mu }^{+}{\mu }^{-}$ in the $L_{\mu }-L_{\tau }$ gauge-symmetric model at Belle

Abstract

We search for a new gauge boson $Z^{\prime }$ that couples only to heavy leptons and their corresponding neutrinos in the process $e^{+}{e}^{-}\to Z^{\prime }(\to {\mu }^{+}{\mu }^{-}){\mu }^{+}{\mu }^{-}$, using a 643 fb${}^{-1}$ data sample collected by the Belle experiment at or near the ${\rm Y}(1S,2S,3S,4S,5S)$ resonances at the KEKB collider. For the first time, effects due to initial state radiation are used in estimating the detection efficiency. No signal is observed in the mass range of 0.212 \ -- 10 GeV/$c^2$ and we set an upper limit on the coupling strengh, $g^{\prime }$, constraining $Z^{\prime }$ as a possible contributor to the anomalous magnetic dipole moment of muon.

10 pages, 8 figures

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Cited by in corpus (7)

• Anomalies in Particle Physics
• Search for an invisible $Z^{\prime }$ in a final state with two muons and missing energy at Belle II
• Probing the $L_{\mu }$-$L_{\tau }$ Gauge Boson at the MUonE Experiment
• Search for a ${\mu }^{+}{\mu }^{-}$ resonance in four-muon final states at Belle II
• Search for a ${\tau }^{+}{\tau }^{-}$ resonance in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}{\tau }^{+}{\tau }^{-}$ events with the Belle II experiment
• Searching for the light leptophilic gauge boson $Z_x$ via four-lepton final states at the CEPC
• Constraining the heavy leptophilic neutral gauge bosons through the $Z\to {\ell }^{+}{\ell }^{-}$, $W^{\pm }\to {\ell }^{\pm }{\nu }_{\ell }$, and $h\to {\ell }^{+}{\ell }^{-}$ decays