Abstract (data abstract)

CERN-LEP. A measurement of the spectral functions of non-strange $\tau$ vector current final states is presented, using 124358 $\tau$ pairs recorded by the ALEPH detector at LEP during the years 1991 to 1994. The spectral functions of the dominant two- and four-pion $\tau$ decay channels are compared to published results of $e^+e^-$ annihilation experiments via isospin rotation. A combined fit of the pion form factor from $\tau$ decays and $e^+e^-$ data is performed using different parametrizations. The mass and the width of the $\rho^{\pm}$(770) and the $\rho^0$(770) are separately determined in order to extract possible isospin violating effects. The mass and width differences are measured to be $M_{\rho^\pm(770)} - M_{\rho^0(770)} = (0.0 \pm 1.0)$ MeV/$c^2$ and $\Gamma_{\rho^\pm(770)} - \Gamma_{\rho^0(770)} = (0.1 \pm 1.9)$ MeV/$c^2$. These numbers have been read from the plots in the paper.

Table 1

Data from F 2

10.17182/hepdata.68475.v1/t1

Invariant mass-squared distribution of the $\tau^- \to h^- \pi^0 \nu_{\tau}$ decay. The error has been set to zero if it...
Table 2

Data from F 3

10.17182/hepdata.68475.v1/t2

Invariant mass-squared distributions of the $h^- 3\pi^0 \nu_{\tau}$ decay channel. The error has been set to zero if it is...
Table 3

Data from F 3

10.17182/hepdata.68475.v1/t3

Invariant mass-squared distribution of the $2h^- h^+ \pi^0 \nu_{\tau}$ decay channel. The error has been set to zero if it...
Table 4

Data from F 3

10.17182/hepdata.68475.v1/t4

Invariant mass-squared distributions of the $2h^- h^+ 3\pi^0 \nu_{\tau}$ decay channel.
Table 5

Data from F 3

10.17182/hepdata.68475.v1/t5

Invariant mass-squared distribution of the $3h^- 2h^+ \pi^0 \nu_{\tau}$ decay channel.
Table 6

Data from F 13

10.17182/hepdata.68475.v1/t6

$\tau^- \to \pi^- \pi^0 \nu_{\tau}$ invariant mass spectrum. The error has been set to zero if it is smaller than...

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