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Physical Review D

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Radiative $τ$ production and decay

D. Y. Wu^a, K. Hayes^b, M. L. Perl, T. Barklow, A. Boyarski, P. R. Burchat^c, D. L. Burke, J. M. Dorfan, G. J. Feldman et al.

G. Abrams, D. Amideiⁱ, A. R. Baden^l, J. Boyer, F. Butler^m, G. Gidal, M. S. Gold, G. Goldhaber, L. Goldingⁿ et al.

L. Gladney^d, G. Hanson^e, R. J. Hollebeek^d, W. R. Innes, J. A. Jaros, D. Karlen^f, S. R. Klein^g, A. J. Lankford, R. R. Larsen, B. W. LeClaire^h, N. S. Lockyer^d, V. Lüth, R. A. Ongⁱ, B. Richter, K. Riles^j, and J. M. Yelton^k

Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309

J. Haggerty^o, D. Herrup^l, I. Juricic^p, J. A. Kadyk, M. E. Levi, M. E. Nelson^a, P. C. Rowson^p, H. Schellman^l, W. B. Schmidke, P. D. Sheldon^q, G. H. Trilling, and D. R. Wood^r

Lawrence Berkeley Laboratory and Department of Physics, University of California, Berkeley, California 94720

Department of Physics, Harvard University, Cambridge, Massachusetts 02138

^aPresent address: California Institute of Technology, Pasadena, CA 91125.
^bPresent address: Hillsdale College, Hillsdale, MI 49242.
^cPresent address: University of California, Santa Cruz, CA 95064.
^dPresent address: University of Pennsylvania, Philadelphia, PA 19104.
^ePresent address: Indiana University, Bloomington, IN 47405.
^fPresent address: Carleton University, Ottawa, Ontario, Canada K1S 5B6.
^gPresent address: Boston University, Boston, MA 02215.
^hPresent address: University of Wisconsin, Madison, WI 53706.
ⁱPresent address: University of Chicago, Chicago, IL 60637.
^jPresent address: University of California, Riverside, CA 92521.
^kPresent address: University of Florida, Gainesville, FL 32611.
^lPresent address: Fermilab, Batavia, IL 60510.
^mPresent address: University of Oklahoma, Norman, OK 73019.
ⁿPresent address: Therma-Wave Corporation, Fremont, CA 94539.
^oPresent address: Brookhaven National Laboratory, Upton, NY 11973.
^pPresent address: Columbia University, New York, NY 10027.
^qPresent address: University of Illinois, Urbana, IL 61801.
^rPresent address: CERN, CH-1211, Genève 23, Switzerland.
^sPresent address: Université de Genève, CH-1211, Genève 4, Switzerland.

Phys. Rev. D 41, 2339(R) – Published 1 April, 1990

DOI: https://doi.org/10.1103/PhysRevD.41.2339

Abstract

We have studied the muon decay channel of the $τ$ lepton with the presence of a photon in $e^{+} e^{-}$ annihilation data at $E_{c . m .} = 29$ GeV from the Mark II detector. Included in this study is the first direct measurement of radiative $τ$ decay. We find the ratio of the measured $τ \to μ γ ν \bar{ν}$ branching fraction to the expected value from QED to be 1.03±0.42.

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