Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN
Abstract
A search for a new Z' gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22e11 electrons on target collected during 2016-2021 runs no signal events were found. This allows to derive new constraints on the Z'-e coupling strength, which for the mass range 0.3 < mZ' < 100 MeV are more stringent compared to those obtained from the neutrino-electron scattering data.
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