Abstract
The three recent experiments of the MARK II, DELCO, and ARGUS groups are reanalysed using an analytically correct Breit-Wigner form including apart from the ρπ also (i) the $$K*\bar K + \bar K*K$$ thresholds, and (ii) an energy dependent real part (a “running” mass shift function involving Chew-Mandelstam functions) to thea 1 mass parameter. It is found that all three experiments can be fitted with ana 1 mass of (1250±40) MeV in agreement with the Particle Data Group value (1275±28) MeV, but in contrast to results presented by the experimental groups. However, the width ofa 1 determined from the τ→a 1ν→3πν decay data is considerably larger than the conventional value.
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