Measurement of the spectral functions of vector current hadronic tau decays.



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.
Date made available2 Jul 2015
  • Measurement of the spectral functions of vector current hadronic tau decays

    Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J. P., Lucotte, A., Minard, M. N., Nief, J. Y., Pietrzyk, B., Casado, M. P., Chmeissani, M., Comas, P., Crespo, J. M., Delfino, M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Juste, A., Martinez, M., & 80 othersMiquel, R., Mir, L. M., Orteu, S., Padilla, C., Park, I. C., Pascual, A., Perlas, J. A., Riu, I., Sanchez, F., Teubert, F., Colaleo, A., Creanza, D., De Palma, M., Gelao, G., Iaselli, G., Maggi, G., Maggi, M., Marinelli, N., Nuzzo, S., Ranieri, A., Raso, G., Ruggieri, F., Selvaggi, G., Silvestris, L., Tempesta, P., Tricomi, A., Zito, G., Huang, X., Lin, J., Ouyang, Q., Wang, T., Xie, Y., Xu, R., Xue, S., Zhang, J., Zhang, L., Zhao, W., Abbaneo, D., Alemany, R., Becker, U., Bazarko, A. O., Bright-Thomas, P., Cattaneo, M., Cerutti, F., Drevermann, H., Forty, R. W., Frank, M., Hagelberg, R., Harvey, J., Janot, P., Jost, B., Kneringer, E., Knobloch, J., Lehraus, I., Lutters, G., Mato, P., Minten, A., Moneta, L., Pacheco, A., Pusztaszeri, J. F., Ranjard, F., Rensing, P., Rizzo, G., Rolandi, L., Schlatter, D., Schmitt, M., Schneider, O., Tejessy, W., Tomalin, I. R., Wachsmuth, H., Wagner, A., Ajaltouni, Z., Barrès, A., Boyer, C., Falvard, A., Ferdi, C., Gay, P., Guicheney, C., Henrard, P. & Jousset, J., 1 Jan 1997, In: Zeitschrift fur Physik C-Particles and Fields. 76, 1, p. 15-33

    Research output: Contribution to journalArticleResearchpeer-review

    204 Citations (Scopus)

Cite this