${\cal B}(B_s^0 \to \mu^+ \mu^- \mu^+ \mu^-)$
| Experiment | Measurement [10-10] | $\Delta\chi^2$ | Reference | Comments |
|---|
| Average | $< 8.6$ | | | |
| PDG | $< 25.0$ | | pdgLive | |
| LHCb | $< 8.6$ | | JHEP 03,109 (2022) | 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.