PT Journal
AU NA64 Collaboration (Andreev, YMea
   Molina Bueno, L
TI Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2022
BP 161801
EP 6pp
VL 129
DI 10.1103/PhysRevLett.129.161801
AB 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 3.22×10^11 electrons on target collected during 2016–2021 runs, no signal events were found. This allows us 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.
ER