Table 2.

Relevant systematic uncertainties on the branching fraction. They are separated, using horizontal lines, into relative uncertainties on (i) ${\mathit{\alpha }}_{ij}$, (ii) on the signal yield from the signal model used in the mass fit, and (iii) on the branching fraction, obtained combining the two categories, from the background model

Source	TOS${}_{\mathit{\mu }}$	TOS${}_{\mathit{\mu }\mathit{\mu }}$
Tracking (%)	0.4	0.4
Selection (%)	1.9	1.8
Trigger (%)	8.1	11.5
$K_{\mathrm{S}}^0$ $p_{\mathrm{T}}$ spectrum (%)	4.3	4.3
Muon identification (%)	0.2	0.3
Signal mass shape (%)	0.8	0.8
Background shape (%)	0.9