Volume 105B, number 1 PHYSICS LETTERS 24 September 1981 A, A PRODUCTION IN e+e - ANNIHILATION AT 33 GeV CENTRE OF MASS ENERGY TASSO Collaboration R. BRANDELIK, W. BRAUNSCHWEIG, K. GATHER, F.J. KIRSCHFINK, K. LUBELSMEYER, H.-U. MARTYN, G. PEISE, J, RIMKUS, H.G. SANDER, D. SCHMITZ, A. SCHULTZ yon DRATZIG, D. TRINES and W. WALLRAFF L Physikalisches Institut der R WTH Aachen, Germany 8 H. BOERNER, H.M. FISCHER, H. HARTMANN, E. HILGER, W. HILLEN, G. KNOP, L. KOPKE, H. KOLANOSKI, P. LEU, R. WEDEMEYER, N. WERMES and M. WOLLSTADT Physikalisches Institut der Universitdt Bonn, Germany 8 H. BURKHARDT, S. COOPER, D. HEYLAND, H. HULTSCHIG, P. JOOS, W. KOCH, U. KOTZ, H. KOWALSKI 1, A. LADAGE, D. LOKE, H.L. LYNCH 2, P. M.~TTIG, K.H. MESS 3, D. NOTZ, J. PYRLIK, D.R. QUARRIE 4, R. RIETHMULLER, P. SODING, B.H. WIIK and G. WOLF Deutsches Elektronen-Synchrotron, DESY, Hamburg, Germany R. FOHRMANN, M. HOLDER, H.L. KRASEMANN, G. POELZ, O. ROMER, R. R(JSCH s and P. SCHMUSER IL Institut ff~r Experimentalphysik der Universitdt Hamburg, Germany 8 I. AL-AGIL, R. BEUSELINCK, D.M. BINNIE, A.J. CAMPBELL, P.J. DORNAN, D.A. GARBUTT, T.D. JONES, W.G. JONES, S.L. LLOYD, D. PANDOULAS, J.K. SEDGBEER, R.A. STERN and S. YARKER Department o f Physics, Imperial College London, England 9 M.G. BOWLER, I.C. BROCK, R.J. CASHMORE, R. DEVENISH, P. GROSSMANN, J. ILLINGWORTH, M. OGG, G.L. SALMON, J. THOMAS, T.R. WYATT and C. YOUNGMAN Department o f Nuclear Physics, Oxford University, England 9 K.W. BELLI B. FOSTER, J.C. HART, J. PROUDFOOT, D.H. SAXON and P.L. WOODWORTH Rutherford and Appleton Laboratories, Chilton, England 9 E. DUCHOVNI, Y. EISENBERG, U. KARSHON, G. MIKENBERG, D. REVEL, E. RONAT and A. SHAPIRA Weizmann Institute, Rehovot, Israel Io T. BARKLOW, J. FREEMAN 6, p. LECOMTE 7, T. MEYER, G. RUDOLPH, E. WICKLUND, SAU LAN WU and G. ZOBERNIG Department of Physics, University of Wisconsin, Madison, W1, USA 11 Received 21 July 1981 1 Now at CERN, Geneva, Switzerland. 2 On leave at UC Santa Barbara, USA. a On leave from CERN, Geneva, Switzerland. 4 On leave from the Rutherford and Appleton Laboratories, Chilton, England. s Now at AEG-Telefunken, Berlin, Germany. 6 Now at FNAL, Batavia, IL, USA. 7 Now at ETH, Ziirich, Switzerland. 0 031 =-9163181/0000--0000/$ 02.50 © North-Holland Publishing Company a Supported by the Deutsches Bundesministerium FtixForschung und Technologic. 9 Supported by the UK Science Research Council. 10 Supported by the Minerva Gesellschaft fiir die Forschung mbH, Miinchen. 11 Supported in part by the US Department of Energy contract WY-76-C-02-0881. 75