${\cal B}(B^0 \to \mu^+ \mu^- \mu^+ \mu^-)$
Experiment
Measurement [10
-10
]
$\Delta\chi^2$
Reference
Comments
Average
$< 1.8$
PDG
$< 6.9$
pdgLive
LHCb
$< 1.8$
JHEP
03
,109 (2022)
The mass windows corresponding to $\phi$ and charmonium resonances decaying to $\mu \mu$ are vetoed.
At CL=95%.
Input values that appear in red are not included in the PDG average.
Quoted upper limits are at 90% confidence level (CL), unless mentioned otherwise.
