These measurements are inferred from the branching fractions for semileptonic decay or other spectator-dominated decays by assuming that the rates for such decays are equal for ${{\mathit B}^{0}}$ and ${{\mathit B}^{+}}$. We do not use measurements which assume equal production of ${{\mathit B}^{0}}$ and ${{\mathit B}^{+}}$ because of the large uncertainty in the production ratio.

VALUE CL% EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1.07 \pm0.04}$ OUR AVERAGE $1.07$ $\pm0.04$ $\pm0.03$ URQUIJO 2007 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $1.067$ $\pm0.041$ $\pm0.033$ AUBERT,B 2006 Y BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ • • We do not use the following data for averages, fits, limits, etc. • • $0.95$ ${}^{+0.117}_{-0.080}$ $\pm0.091$ 1 ARTUSO 1997 CLE2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $1.15$ $\pm0.17$ $\pm0.06$ 2 JESSOP 1997 CLE2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $0.93$ $\pm0.18$ $\pm0.12$ 3 ATHANAS 1994 CLE2 Sup. by ARTUSO 1997 $0.91$ $\pm0.27$ $\pm0.21$ 4 ALBRECHT 1992 C ARG ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $1.0$ $\pm0.4$ 29 4, 5 ALBRECHT 1992 G ARG ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $0.89$ $\pm0.19$ $\pm0.13$ 4 FULTON 1991 CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $1.00$ $\pm0.23$ $\pm0.14$ 4 ALBRECHT 1989 L ARG ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $0.49\text{ to }2.3 $ 90 6 BEAN 1987 B CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ 1  ARTUSO 1997 uses partial reconstruction of ${{\mathit B}}$ $\rightarrow$ ${{\mathit D}^{*}}{{\mathit \ell}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ and independent of ${{\mathit B}^{0}}$ and ${{\mathit B}^{+}}$ production fraction. 2  Assumes equal production of ${{\mathit B}^{+}}$ and ${{\mathit B}^{0}}$ at the ${{\mathit \Upsilon}{(4S)}}$. 3  ATHANAS 1994 uses events tagged by fully reconstructed ${{\mathit B}^{-}}$ decays and partially or fully reconstructed ${{\mathit B}^{0}}$ decays. 4  Assumes equal production of ${{\mathit B}^{0}}$ and ${{\mathit B}^{+}}$. 5  ALBRECHT 1992G data analyzed using ${{\mathit B}}$ $\rightarrow$ ${{\mathit D}_{{{s}}}}{{\overline{\mathit D}}}$, ${{\mathit D}_{{{s}}}}{{\overline{\mathit D}}^{*}}$, ${{\mathit D}_{{{s}}}^{*}}{{\overline{\mathit D}}}$, ${{\mathit D}_{{{s}}}^{*}}{{\overline{\mathit D}}^{*}}$ events. 6  BEAN 1987B assume the fraction of ${{\mathit B}^{0}}{{\overline{\mathit B}}^{0}}$ events at the ${{\mathit \Upsilon}{(4S)}}$ is $0.41$.

References