Tau Decays into Three Charged Leptons and Two Neutrinos

M. S. Alam, I. J. Kim, Z. Ling, A. H. Mahmood, J. J. O’neill, H. Severini, C. R. Sun, S. Timm, F. Wappler, J. E. Duboscq, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. Sung, C. White, R. WankeA. Wolf, M. M. Zoeller, X. Fu, B. Nemati, S. J. Richichi, W. R. Ross, P. Skubic, M. Wood, M. Bishai, J. Fast, E. Gerndt, J. W. Hinson, T. Miao, D. H. Miller, M. Modesitt, E. I. Shibata, I. P.J. Shipsey, P. N. Wang, L. Gibbons, S. D. Johnson, Y. Kwon, S. Roberts, E. H. Thorndike, C. P. Jessop, K. Lingel, H. Marsiske, M. L. Perl, S. F. Schaffner, Y. Kubota, R. Poling, CLEO Collaboration

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Abstract

We search for the radiative leptonic tau decays τ→ee+eντνe and τ→μe+eντνμ using 3.60fb−1 of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We present a first observation of the τ→ee+eντνe process. For this channel we measure the branching fraction B(τ→ee+eντνe) = (2.7+1.5+0.4+0.1−1.1−0.4−0.3)×10−5. An upper limit is established for the second channel: B(τ→μe+eντνμ) < 3.2 × 10−5 at 90% C.L. Both results are consistent with the rates expected from standard model predictions.

Original languageEnglish (US)
Pages (from-to)2637-2641
Number of pages5
JournalPhysical review letters
Volume76
Issue number15
DOIs
StatePublished - 1996

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    Alam, M. S., Kim, I. J., Ling, Z., Mahmood, A. H., O’neill, J. J., Severini, H., Sun, C. R., Timm, S., Wappler, F., Duboscq, J. E., Fulton, R., Fujino, D., Gan, K. K., Honscheid, K., Kagan, H., Kass, R., Lee, J., Sung, M., White, C., ... CLEO Collaboration (1996). Tau Decays into Three Charged Leptons and Two Neutrinos. Physical review letters, 76(15), 2637-2641. https://doi.org/10.1103/PhysRevLett.76.2637