TY  - JOUR
AU  - Belle II Collaboration (Adachi, I. et al
AU  - Gomis, P.
AU  - Marinas, C.
PY  - 2020
DA  - 2020//
TI  - Search for an Invisibly Decaying Z ' Boson at Belle II in e(+)e(-) -> mu(+)mu(-) (e(+/-)mu(-/+)) Plus Missing Energy Final States
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 141801
EP  - 9pp
VL  - 124
IS  - 14
PB  - Amer Physical Soc
AB  - Theories beyond the standard model often predict the existence of an additional neutral boson, the Z'. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z' in the process e(+)e(-) -> mu(+)mu(-) Z' and of a lepton-flavor-violating Z' in e(+) e(-) -> e(+/-)mu(-/+)Z'. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an L, – L, theory, into upper limits on the Z' coupling constant at the level of 5 x 10(-2) – 1 for M-z' <= 6 GeV/c(2).
SN  - 0031-9007
UR  - https://arxiv.org/abs/1912.11276
UR  - https://doi.org/10.1103/PhysRevLett.124.141801
DO  - 10.1103/PhysRevLett.124.141801
LA  - English
N1  - WOS:000523637800002
ID  - BelleIICollaborationAdachi_etal2020
ER  -