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

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S047T

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 1 AAIJ 2025 AM   LHCB ${{\mathit \Omega}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Omega}_{{{c}}}^{0}}{{\mathit \pi}^{-}}$ , ${{\mathit \Omega}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ $243$ $\pm48$ $\pm11$ 88 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 Y   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 J   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. • • $72$ $\pm11$ $\pm11$ 64 LINK 2003 C   FOCS ${{\mathit \Omega}^{-}}{{\mathit \pi}^{+}}$, ${{\mathit \Xi}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$ $55$ ${}^{+13}_{-11}$ ${}^{+18}_{-23}$ 86 ADAMOVICH 1995 B   WA89 ${{\mathit \Omega}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$, ${{\mathit \Xi}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$ $86$ ${}^{+27}_{-20}$ $\pm28$ 25 FRABETTI 1995 D   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.

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