Published in
arXiv, 2022
DOI: 10.48550/arxiv.2207.09979
American Physical Society, Physical Review Letters, 16(129), 2022
DOI: 10.1103/physrevlett.129.161801
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Search for a New B−L Z′ Gauge Boson with the NA64 Experiment at CERN
Journal article published in 2022 by
Y.-U. M. Andreev,
Y. M. Andreev,
D. Banerjee,
B. Banto Oberhauser,
J. Bernhard 
,
P. Bisio,
M. Bondi,
V. E. Burtsev,
A. Celentano,
N. Charitonidis,
A. G. Chumakov,
D. Cooke,
P. Crivelli,
E. Depero,
A. V. Dermenev
and other authors.
,
P. Bisio,
M. Bondi,
V. E. Burtsev,
A. Celentano,
N. Charitonidis,
A. G. Chumakov,
D. Cooke,
P. Crivelli,
E. Depero,
A. V. Dermenev
and other authors.
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 $0.3 < m_{Z'} < 100$ MeV are more stringent compared to those obtained from the neutrino-electron scattering data.