New determination of the Michel parameter in tau decay

S. Behrends, T. Gentile, Jan M. Guida, Joan A. Guida, F. Morrow, R. Poling, C. Rosenfeld, E. H. Thorndike, P. Tipton, D. Besson, J. Green, R. Namjoshi, F. Sannes, P. Skubic, R. Stone, D. Bartoletto, A. Chen, L. Garren, M. Goldberg, N. HorwitzA. Jawahery, P. Lubrano, G. C. Moneti, C. G. Trahern, H. Van Hecke, S. E. Csorna, M. D. Mestayer, R. S. Panvini, G. B. Word, Xia Yi, M. S. Alam, A. Bean, T. Ferguson, P. Avery, C. Bebek, K. Berkelman, D. G. Cassel, T. Copie, R. DeSalvo, J. W. DeWire, R. Ehrlich, R. S. Galik, M. G.D. Gilchriese, B. Gittelman, S. W. Gray, A. M. Halling, D. L. Hartill, B. K. Heltsley, S. Holzner, M. Ito, J. Kandaswamy, D. L. Kreinick, Y. Kubota, N. B. Mistry, E. Nordberg, M. Ogg, D. Peterson, D. Perticone, M. Pisharody, K. Read, A. Silverman, P. C. Stein, S. Stone, Xu Kezun, A. J. Sadoff, T. Bowcock, R. T. Giles, J. Hassard, K. Kinoshita, F. M. Pipkin, Richard Wilson, P. Haas, M. Hempstead, T. Jensen, H. Kagan, R. Kass

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Abstract

We have used the leptonic decays of the tau to determine the Lorentz structure of its decay vertex. We find the Michel parameter to be 0.710.090.03, which is consistent with V-A (=0.75) and inconsistent with V+A. This measurement represents the first such analysis using muons in the final state.

Original languageEnglish (US)
Pages (from-to)2468-2470
Number of pages3
JournalPhysical Review D
Volume32
Issue number9
DOIs
StatePublished - Jan 1 1985
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Behrends, S., Gentile, T., Guida, J. M., Guida, J. A., Morrow, F., Poling, R., Rosenfeld, C., Thorndike, E. H., Tipton, P., Besson, D., Green, J., Namjoshi, R., Sannes, F., Skubic, P., Stone, R., Bartoletto, D., Chen, A., Garren, L., Goldberg, M., ... Kass, R. (1985). New determination of the Michel parameter in tau decay. Physical Review D, 32(9), 2468-2470. https://doi.org/10.1103/PhysRevD.32.2468