The Michel parameter for the decay $\tau \to$ν
- Janssen, H.
- Antreasyan, D.
- Cabenda, R.
- Cartacci, A.
- Cavalli-Sforza, M.
- Clare, R.
- Compagnucci, A.
- Conforto, G.
- Cooper, S.
- Cowan, R.
- Coyne, D.
- Engler, A.
- Bartels, H. W.
- Fairfield, K.
- Folger, G.
- Fridman, A.
- Gaiser, J.
- Gelphman, D.
- Glaser, G.
- Godfrey, G.
- Graaf, K.
- Heimlich, F. H.
- Heinsius, F. H.
- Besset, D.
- Hofstadter, R.
- Irion, J.
- Jakubowski, Z.
- Karch, K.
- Keh, S.
- Kiel, T.
- Kilian, H.
- Kirkbride, I.
- Kloiber, T.
- Kobel, M.
- Bieler, Ch.
- Koch, W.
- König, A. C.
- Königsmann, K.
- Krämer, R. W.
- Krüger, S.
- Landi, G.
- Lee, R.
- Leffler, S.
- Lekebusch, R.
- Litke, A. M.
- Bienlein, J. K.
- Lockman, W.
- Lowe, S.
- Lurz, B.
- Marlow, D.
- Marsiske, H.
- Maschmann, W.
- McBride, P.
- Meyer, H.
- Muryn, B.
- Messing, F.
- Bizzeti, A.
- Metzger, W. J.
- Monteleoni, B.
- Nernst, R.
- Niczyporuk, B.
- Nowak, G.
- Peck, C.
- Pelfer, P. G.
- Pollock, B.
- Porter, F. C.
- Prindle, D.
- Bloom, E. D.
- Ratoff, P.
- Reidenbach, M.
- Renger, B.
- Rippich, C.
- Scheer, M.
- Schmitt, P.
- Schotanus, J.
- Schütte, J.
- Schwarz, A.
- Sievers, D.
- Brock, I.
- Skwarnicki, T.
- Stock, V.
- Strauch, K.
- Strohbusch, U.
- Tompkins, J.
- Trost, H. J.
- Van Uitert, B.
- Van De Walle, R. T.
- Vogel, H.
- Voigt, A.
- Brockmüller, K.
- Volland, U.
- Wachs, K.
- Wacker, K.
- Walk, W.
- Wegener, H.
- Williams, D. A.
- Zschorsch, P.
- Crystal Ball Collaboration
DOIAbstract
The Crystal Ball detector at the Doris II storage ring at DESY has been used to study the electron energy spectrum of the decay τ→evv̄. In the standard model the Lorentz structure of the decay matrix element is of the well known V-A type, resulting in a Michel parameter of p=0.75. Our spectrum is found to be consistent with this value. A fit yields the value of 0.64±0.07
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