${{\mathit \Omega}_{{{c}}}^{0}}$ MEAN LIFE INSPIRE search

S047T

VALUE ($ 10^{-15} $ s)

EVTS

DOCUMENT ID

TECN

COMMENT

$\bf{ 274 \pm10}$

OUR AVERAGE

$276.3$ $\pm19.4$ $\pm1.8$ $\pm0.7$

0.36k

AAIJ

2025

LHCB

${{\mathit \Omega}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Omega}_{{{c}}}^{0}}{{\mathit \pi}^{-}}$ , ${{\mathit \Omega}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$

$243$ $\pm48$ $\pm11$

ABUDINEN

2023

BEL2

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Omega}_{{{c}}}^{0}}{+}$ ${{\mathit X}}$, ${{\mathit \Omega}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\mathit \pi}^{+}}$

$276.5$ $\pm13.4$ $\pm4.5$

² ^{, 3}

AAIJ

2022

LHCB

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Omega}_{{{c}}}}{{\mathit X}}$, ${{\mathit \Omega}_{{{c}}}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$

$268$ $\pm24$ $\pm10$

978

² ^{, 4}

AAIJ

2018

LHCB

${{\mathit \Omega}_{{{b}}}}$ $\rightarrow$ ${{\mathit \Omega}_{{{c}}}}{{\mathit \mu}}{{\mathit \nu}}{+}$ ${{\mathit X}}$, ${{\mathit \Omega}_{{{c}}}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$

• • • We do not use the following data for averages, fits, limits, etc. • • •

$72$ $\pm11$ $\pm11$

LINK

2003

FOCS

${{\mathit \Omega}^{-}}{{\mathit \pi}^{+}}$, ${{\mathit \Xi}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$

$55$ ${}^{+13}_{-11}$ ${}^{+18}_{-23}$

ADAMOVICH

1995

WA89

${{\mathit \Omega}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$, ${{\mathit \Xi}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$

$86$ ${}^{+27}_{-20}$ $\pm28$

FRABETTI

1995

E687

${{\mathit \Sigma}^{+}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$

¹ Uses ${{\mathit B}^{-}}$ $\rightarrow$ ${{\mathit D}^{0}}{{\mathit \pi}^{-}}$ , ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ as a normalization mode to minimize the uncertainties associated with the decay time acceptance. The third uncertainty is due to the uncertainty of the ${{\mathit D}^{0}}$ lifetime, which is taken to be $410.3$ $\pm1.0$ fs.

² Recent measurements by AAIJ 2018J, AAIJ 2022Y, and ABUDINEN 2023 obtain consistent results that are nearly four times larger than the average result of previous experiments, ($69$ $\pm12$) $ \times 10^{-15}$ s. We go with the more recent results, mostly obtained with much larger data samples, and also note the positive correlation between the measured value and the inverse of the estimated statistical uncertainty in lifetime measurements.

³ AAIJ 2022Y reports this measurement as ($276.5$ $\pm13.4$ $\pm4.4$ $\pm0.7$) $ \times 10^{-15}$ s. The last uncertainty is due to the uncertainty on the ${{\mathit D}^{0}}$ lifetime ${\mathit \tau}_{{{\mathit D}^{0}}}$ = ($410.1$ $\pm1.5$) fs from PDG 2020. Measured in ${{\mathit \Omega}_{{{c}}}}$ produced promptly in ${{\mathit p}}{{\mathit p}}$ collisions, using ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ as normalisation mode.

⁴ Measured using ${{\mathit \Omega}_{{{c}}}}$ produced in semileptonic ${{\mathit \Omega}_{{{b}}}}$ decays.

References:

AAIJ

2025AM

JHEP 2509 157

Measurement of the $?_c^0$ and $?_c^0$ baryon lifetimes using hadronic $b$-baryon decays

ABUDINEN

2023

PR D107 L031103

Measurement of the