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A considerable improvement on the precision of the DIRAC measurement on the pionium lifetime was achieved after the analysis of a dedicated measurement on multiple scattering in the set-up, especially when compared to the published lifetime [1] from a subset of data. A further equally important improvement is obtained by including more data in the analysis. Preliminary values for the new precision show that an accuracy for the lifetime of 10% can be reached with existing data.

An update of the DIRAC result on the pion-pion |a0-a2| scattering length