${\cal{B}}( B^0_s \to aa ) \times {\cal{B}}( a \to \mu^+ \mu^- ) \times {\cal{B}}( a \to \mu^+ \mu^- )$

ExperimentMeasurement [10-10]$\Delta\chi^2$ReferenceComments
Average$< 5.8$
LHCb$< 5.8$JHEP 03,109 (2022)The mass windows corresponding to $\phi$ and charmonium resonances decaying to $\mu \mu$ are vetoed.
$a$ is a promptly decaying scalar particle with a mass of 1 $\text{GeV}/c^2$ .
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.