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1
Not independent of the mass difference measurement below. Observed in ${{\mathit \Xi}_{{b}}^{0}}{{\mathit \pi}^{-}}$ channel with ${{\mathit \Xi}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Xi}_{{c}}^{+}}{{\mathit \pi}^{-}}$ and ${{\mathit \Xi}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ .
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