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${{\mathit K}_L^0}$ MEAN LIFE

INSPIRE   PDGID:

S013T

VALUE ($ 10^{-8} $ s) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 5.116 \pm0.021}$ OUR FIT  Error includes scale factor of 1.1. $\bf{ 5.099 \pm0.021}$ OUR AVERAGE $5.072$ $\pm0.011$ $\pm0.035$ 13M 1 AMBROSINO 2006 KLOE $\sum_{i}$ B$_{i}$ = 1 $5.092$ $\pm0.017$ $\pm0.025$ 15M AMBROSINO 2005 C KLOE $5.154$ $\pm0.044$ 0.4M VOSBURGH 1972 CNTR • • We do not use the following data for averages, fits, limits, etc. • • $5.15$ $\pm0.14$ DEVLIN 1967 CNTR 1  AMBROSINO 2006 uses ${{\mathit \phi}}$ $\rightarrow$ ${{\mathit K}_{{{L}}}}{{\mathit K}_{{{S}}}}$ with ${{\mathit K}_{{{L}}}}$ tagged by ${{\mathit K}_{{{S}}}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$. The four major ${{\mathit K}_{{{L}}}}$ BR's are measured, the small remainder (${{\mathit \pi}^{+}}{{\mathit \pi}^{-}},{{\mathit \pi}^{0}}{{\mathit \pi}^{0}},{{\mathit \gamma}}{{\mathit \gamma}}$) is taken from PDG 2004. This KLOE ${{\mathit K}_{{{L}}}}$ lifetime is obtained by imposing $\sum_{i}$ B$_{i}$ = 1. The correlation matrix among the four measured ${{\mathit K}_{{{L}}}}$ BR's and this ${{\mathit K}_{{{L}}}}$ lifetime is     ${{\mathit K}_{{{{e3}}}}}$ ${{\mathit K}}_{{{\mathit \mu}}3}$ 3${{\mathit \pi}^{0}}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ ${{\mathit \tau}}_{{{\mathit K}_{{{L}}}}}$   ${{\mathit K}_{{{{e3}}}}}$ 1 $-0.25$ $-0.56$ $-0.07$ 0.25   ${{\mathit K}}_{{{\mathit \mu}}3}$   1 $-0.43$ $-0.20$ 0.33   3${{\mathit \pi}^{0}}$     1 $-0.39$ $-0.21$   ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$       1 $-0.39$   ${{\mathit \tau}}_{{{\mathit K}_{{{L}}}}}$         1 These correlations are taken into account in our fit. The average of this KLOE mean life measurement and the independent KLOE measurement in AMBROSINO 2005C is ($5.084$ $\pm0.023$) $ \times 10^{-8}$ s.

References

 

see fit info