1.
Phys Rev Lett
; 129(16): 161801, 2022 Oct 14.
Artigo
em Inglês
| MEDLINE
| ID: mdl-36306760
RESUMO
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 0.3â²m_{Z^{'}}â²100 MeV, are more stringent compared to those obtained from the neutrino-electron scattering data.