${\cal B}(B^0 \to K^+ \pi^-)$

ExperimentMeasurement [10-5]$\Delta\chi^2$ReferenceComments
Average$1.946 \pm0.046$9.75$p=0.94$ (ndf=18)
PDG$1.958 \pm0.049$pdgLive
Belle$2.000 \pm0.034 \pm0.060$0.62 Phys.Rev.D 87,031103 (2013)
BaBar$1.91 \pm0.06 \pm0.06$0.18 Phys.Rev.D 75,012008 (2007)
Belle II$1.80 \pm0.09 \pm0.09$1.31 arXiv:2106.03766
CLEO$1.80\,^{+0.23}_{-0.21}\,^{+0.12}_{-0.09}$0.33 Phys.Rev.D 68,052002 (2003)
CDF$( {\cal B}(B_s^0 \to K^- \pi^+) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.03 Phys.Rev.Lett. 103,031801 (2009)
CDF$( {\cal B}(\Lambda_b^0 \to p \pi^-) / {\cal B}(B^0 \to K^+ \pi^-) ) ( f_{\Lambda^0_b} / f_{d} )$0.20 Phys.Rev.Lett. 103,031801 (2009)
CDF${\cal B}(B^0 \to \pi^+ \pi^-) / {\cal B}(B^0 \to K^+ \pi^-)$0.05 Phys.Rev.Lett. 106,181802 (2011)
CDF$( {\cal B}(B_s^0 \to K^+ K^-) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.40 Phys.Rev.Lett. 106,181802 (2011)
CDF${\cal B}(B^0 \to K^+ K^-) / {\cal B}(B^0 \to K^+ \pi^-)$1.25 Phys.Rev.Lett. 108,211803 (2012)
CDF$( {\cal B}(B_s^0 \to \pi^+ \pi^-) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.17 Phys.Rev.Lett. 108,211803 (2012)
LHCb${\cal B}(B^0 \to \pi^+ \pi^-) / {\cal B}(B^0 \to K^+ \pi^-)$0.02 JHEP 10,037 (2012)
LHCb$( {\cal B}(B_s^0 \to K^+ K^-) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.37 JHEP 10,037 (2012)
LHCb$( {\cal B}(B_s^0 \to K^- \pi^+) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.01 JHEP 10,037 (2012)
LHCb${\cal B}(B^0 \to K^+ K^-) / {\cal B}(B^0 \to K^+ \pi^-)$0.03 Phys.Rev.Lett. 118,081801 (2017)
LHCb$( {\cal B}(B_s^0 \to \pi^+ \pi^-) / {\cal B}(B^0 \to K^+ \pi^-) ) \frac{f_s}{f_d}$0.04 Phys.Rev.Lett. 118,081801 (2017)
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Input values in blue correspond to yet unpublished results.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^0 \to \pi^+ \pi^-)$25.4$5.15 \pm0.19 \times 10^{-6}$
fit${\cal B}(B_s^0 \to K^+ K^-)$20.5$2.66\,^{+0.32}_{-0.27} \times 10^{-5}$
fit${\cal B}(B_s^0 \to K^- \pi^+)$16.6$5.90\,^{+0.87}_{-0.76} \times 10^{-6}$
fit${\cal B}(B_s^0 \to \pi^+ \pi^-)$15.5$7.2\,^{+1.1}_{-1.0} \times 10^{-7}$
fit${\cal B}(B^0 \to K^+ K^-)$12.3$8.0 \pm1.5 \times 10^{-8}$
fit${\cal B}(\Lambda_b^0 \to p \pi^-)$7.8$4.55\,^{+0.91}_{-0.82} \times 10^{-6}$
fit${\cal B}(\Lambda_b^0 \to p K^-)$6.5$5.4 \pm1.1 \times 10^{-6}$
fit${\cal B}(\Lambda_b^0 \to \Lambda^0 \phi(1020))$-1.2$1.01\,^{+0.29}_{-0.25} \times 10^{-5}$
fit${\cal B}(B^0 \to \phi(1020) K^0)$-0.0$7.25 \pm0.60 \times 10^{-6}$
fit${\cal B}(B_s^0 \to K^0 \bar{K}^0)$-0.0$1.74 \pm0.31 \times 10^{-5}$
external$f_{\Lambda^0_b}$2.3$8.1 \pm1.1 \times 10^{-2}$0.09
external$\frac{f_s}{f_d}$0.7$0.241 \pm0.023$0.05
external$f_{d}$-0.3$0.4083 \pm0.0070$0.00
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.