Kavli Affiliate: T. Higuchi
| First 5 Authors: T. Czank, I. Jaegle, A. Ishikawa, I. Adachi, K. Adamczyk
| Summary:
We search for a new gauge boson $Z’$ that couples only to heavy leptons and
their corresponding neutrinos in the process $e^{+} e^{-} rightarrow
Z'(rightarrow mu^{+}mu^{-}) mu^{+}mu^{-}$, using a 643 fb$^{-1}$ data
sample collected by the Belle experiment at or near the
$Upsilon(1S,2S,3S,4S,5S)$ 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/${it
c}^2$ and we set an upper limit on the coupling strengh, $g’$, constraining
$Z’$ as a possible contributor to the anomalous magnetic dipole moment of muon.
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