${\cal B}(B^+ \to f_1(1420) K^+) \times {\cal B}(f_1(1420) \to K^* \overline{K})$

ExperimentMeasurement [10-5]$\Delta\chi^2$ReferenceComments
Average$1.14 \pm0.21$
PDG$< 0.41$pdgLive
LHCb$1.14 \pm0.06 \pm0.20$0.00 Phys.Rev.D 111,092009 (2025)Extracted from an amplitude analysis of the $K^0_S K^\pm \pi^\mp$ spectrum in $B^+ \to K^0_S K^\pm \pi^\mp K^+$ decays, in the mass region $m(K^0_S K^\pm \pi^\mp) < 1.85\;\mathrm{GeV}$.
BaBar$< 0.41$Phys.Rev.Lett. 101,091801 (2008)
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.