A measurement of the spectral functions of non-strange τ vector current final states is presented, using 124 358 τ pairs recorded by the ALEPH detector at LEP during the years 1991 to 1994. The spectral functions of the dominant two- and four-pion τ decay channels are compared to published results of e+e- annihilation experiments via isospin rotation. A combined fit of the pion form factor from τ decays and e+e- data is performed using different parametrizations. The mass and the width of the ρ±(770) and the ρ0(770) are separately determined in order to extract possible isospin violating effects. The mass and width differences are measured to be Mρ±(770) - Mρ0(770) = (0.0 ± 1.0) MeV/c2 and Γρ±(770) - Γρ0(770) = (0.1 ± 1.9) MeV/c2.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Measurement of the spectral functions of vector current hadronic tau decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 76(1), 15-33 [10.1007/s002880050523].

Measurement of the spectral functions of vector current hadronic tau decays

CARPINELLI, Massimo;
1997

Abstract

A measurement of the spectral functions of non-strange τ vector current final states is presented, using 124 358 τ pairs recorded by the ALEPH detector at LEP during the years 1991 to 1994. The spectral functions of the dominant two- and four-pion τ decay channels are compared to published results of e+e- annihilation experiments via isospin rotation. A combined fit of the pion form factor from τ decays and e+e- data is performed using different parametrizations. The mass and the width of the ρ±(770) and the ρ0(770) are separately determined in order to extract possible isospin violating effects. The mass and width differences are measured to be Mρ±(770) - Mρ0(770) = (0.0 ± 1.0) MeV/c2 and Γρ±(770) - Γρ0(770) = (0.1 ± 1.9) MeV/c2.
Articolo in rivista - Articolo scientifico
Physics
English
15
33
19
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Measurement of the spectral functions of vector current hadronic tau decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 76(1), 15-33 [10.1007/s002880050523].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390194
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