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Unlike the Review of Particle Physics, the clear nonzero values of the mass and width differences of the neutral and charged [Formula: see text] mesons are determined by an application of the Unitary &amp; Analytic model of the pion electromagnetic and the pion weak form factor in a description of the data on [Formula: see text] and [Formula: see text] processes, respectively. Also the mass and the width differences of the neutral and charged [Formula: see text] and [Formula: see text] mesons are determined for the first time, however, they are masked by large evaluated errors. Therefore, in order to come to a definite conclusion, more precise data on [Formula: see text] and [Formula: see text] in the region of [Formula: see text] and [Formula: see text] mesons are desirable.

The mass and width differences of the neutral and charged ρ(770), ρ(1450) and ρ(1700) mesons from e+e−→ π+π− and τ−→ ντπ−π0 processes