Volume 100B, number 4 PHYSICS LETTERS 9 April 1981 EVIDENCE FOR CHARGED PRIMARY PARTONS IN e+e - ~ 2 JETS TASSO Collaboration R. BRANDELIK, W. BRAUNSCHWEIG, K: GATHER, V. KADANSKY t, F.J. KIRSCHFINK, K. LIJBELSMEYER, H.-U. MARTYN, G. PEISE, J. RIMKUS, H.G. SANDER, D. SCHMITZ, A. SCHULTZ von DRATZIG, D. TRINES and W. WALLRAFF L Physikalisches Institut der R WTHAachen, Germany 2 H. BOERNER, H.M. FISCHER, H. HARTMANN, E. HILGER, W. HILLEN, G. KNOP, L. KOEPKE, H. KOLANOSKI, P. LEU, R. WEDEMEYER, N. WERMES and M. WOLLSTADT Physikalisches Institut der Universita't Bonn, Germany z H. BURKHARDT, D.G. CASSEL a, D. HEYLAND, H. HULTSCHIG, P. JOOS, W. KOCH, P. KOEHLER*, U. K()TZ, H. KOWALSKI, A. LADAGE, D. LI~KE, H.L. LYNCH, P. MATTIG, D. NOTZ, J. PYRLIK, R. RIETHMULLER, P. SODING, B.H. WlIK and G. WOLF Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany R. FOHRMANN, M. HOLDER, G. POELZ, O. ROMER, R. RUSCH and P. SCHMIJSER 11. lnstitut fiir Experimentalphysik der Universith'tHamburg, Germany 2 I. AL-AGIL, R. BEUSELINK, D.M. BINNIE, P.J. DORNAN, D.A. GARBUTT, W.G. JONES, S.L. LLOYD, D. PANDOULAS, J. SEDGBEER, R.A. STERN and S. YARKER Department of Physics, Imperial College London, England s I.C. BROCK, R.J. CASHMORE, R. DEVENISH, P. GROSSMANN, J, ILLINGWORTH, M. OGG, G.L. SALMON, T.R. WYATT and C. YOUNGMAN Department of Nuclear Physics, Oxford University, England 5 K.W. BELL, B. FOSTER, J.C. HART, J. PROUDFOOT, D,R. QUARRIE, D.H. SAXON and P.L. WOODWORTH Rutherford and Appleton Laboratories, Chilton, England s E. DUCHOVNI, Y. EISENBERG, U. KARSHON, G. MIKENBERG, D. REVEL, E. RONAT and A. SHAPIRA Weizmann Institute, Rehovot, lsrael 6 T. BARKLOW, J. FREEMAN, P. LECOMTE 7, T. MEYER, G. RUDOLPH, E. WlCKLUND, SAU LAN WU and G. ZOBER.NIG Department o f Physics, University of Wisconsin, Madison, WI, USA 1 Now at Lufthansa AG, Hamburg. 2 Supported by the Deutsches Bundesministerium fiir For- schung und Technologic. 3 On leave from Cornell University, Ithaca, NY, USA. 4 On leave from FNAL, Batavia, IL, USA. s Supported by the UK Science Research Council. 6 Supported by the Minerva Gesellschaft f'tir die Forschung mbH, Miinehen. 7 Now at ETH, Ziirich, Switzerland. 8 Supported in part by the US Department of Energy contract WY-76-C-02-0881 • 0 031-9163/81/0000-0000/$ 02.50 © North-Holland Publishing Company 357