${\cal B}(B^0 \to \phi(1020) K^0)$

ExperimentMeasurement [10-6]$\Delta\chi^2$ReferenceComments
Average$7.25 \pm0.60$9.75$p=0.94$ (ndf=18)
PDG$7.32\,^{+0.69}_{-0.63}$pdgLive
BaBar$7.1 \pm0.6\,^{+0.4}_{-0.3}$0.04 Phys.Rev.D 85,112010 (2012)Result extracted from Dalitz-plot analysis of $B^0 \to K_S^0 K^+ K^-$ decays.
Belle II$5.9 \pm1.8 \pm0.7$0.49 arXiv:2008.03873
Belle$9.0\,^{+2.2}_{-1.8} \pm0.7$0.81 Phys.Rev.Lett. 91,201801 (2003)
LHCb$( {\cal B}(\Lambda_b^0 \to \Lambda^0 \phi(1020)) / {\cal B}(B^0 \to \phi(1020) K^0) ) ( f_{\Lambda^0_b} / f_{d} ) 2$0.00 Phys.Lett.B 759,282 (2016)
LHCb${\cal B}(B_s^0 \to K^0 \bar{K}^0) / {\cal B}(B^0 \to \phi(1020) K^0)$0.05 Phys.Rev.D 102,012011 (2020)Multiple systematic uncertainties are added in quadrature.
Input values that appear in red are not included in the PDG average.
Input values in blue correspond to yet unpublished results.

Further parameters used in the fit and their correlation with the average

SourceParameterCorrelation [%]Value$\Delta\chi^2$
fit${\cal B}(B_s^0 \to K^0 \bar{K}^0)$36.3$1.74 \pm0.31 \times 10^{-5}$
fit${\cal B}(\Lambda_b^0 \to \Lambda^0 \phi(1020))$31.6$1.01\,^{+0.29}_{-0.25} \times 10^{-5}$
fit${\cal B}(\Lambda_b^0 \to p \pi^-)$0.0$4.55\,^{+0.91}_{-0.82} \times 10^{-6}$
fit${\cal B}(\Lambda_b^0 \to p K^-)$0.0$5.4 \pm1.1 \times 10^{-6}$
fit${\cal B}(B^0 \to K^+ \pi^-)$-0.0$1.946 \pm0.046 \times 10^{-5}$
fit${\cal B}(B^0 \to \pi^+ \pi^-)$-0.0$5.15 \pm0.19 \times 10^{-6}$
fit${\cal B}(B_s^0 \to K^+ K^-)$-0.0$2.66\,^{+0.32}_{-0.27} \times 10^{-5}$
fit${\cal B}(B_s^0 \to K^- \pi^+)$-0.0$5.90\,^{+0.87}_{-0.76} \times 10^{-6}$
fit${\cal B}(B_s^0 \to \pi^+ \pi^-)$-0.0$7.2\,^{+1.1}_{-1.0} \times 10^{-7}$
fit${\cal B}(B^0 \to K^+ K^-)$-0.0$8.0 \pm1.5 \times 10^{-8}$
external$f_{\Lambda^0_b}$-0.1$8.1 \pm1.1 \times 10^{-2}$0.09
external$f_{d}$0.0$0.4083 \pm0.0070$0.00
external$\frac{f_s}{f_d}$-0.0$0.241 \pm0.023$0.05
Parameters of interest whose average is determined from individual measurements are called fit parameters. Parameters that are needed by the fit (in particular daughter branching fraction) and whose average is not determined here, but taken from somewhere else (usually PDG) are called external parameters.