Four-Jet Final State Production In E(+)E(-) Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev

D. Buskulic et al.,D. Buskulic, D. Decamp, P. Ghez, C. Goy,P. Lees,A. Lucotte,N. Minard,P. Odier, B. Pietrzyk,M. Chmeissani,M. Delfino,I. Efthymiopoulos,E. Fernandez,M. Fernandez-Bosman,A. Juste,M. Martinez,S. Orteu,C. Padilla,A. Pascual, I. Riu,F. Sanchez,F. Teubert,A. Colaleo, D. Creanza,M. de Palma,G. Gelao,M. Girone,G. Iaselli, G. Maggi, M. Maggi,N. Marinelli,S. Nuzzo,A. Ranieri,G. Raso,F. Ruggieri,G. Selvaggi,L. Silvestris,P. Tempesta, G. Zito,X. Huang,J. Lin, Q. Ouyang,T. Wang,Y. Xie,R. Xu,S. Xue,J. Zhang, L. Zhang, W. Zhao,R. Alemany,M. Cattaneo,P. Comas,P. Coyle, H. Drevermann,M. Frank,R. Hagelberg,J. Harvey,P. Janot, B. Jost, E. Kneringer, J. Knobloch,I. Lehraus,G. Lutters,P. Mato,A. Minten,R. Miquel,M. Mir,L. Moneta,T. Oest,A. Pacheco,F. Ranjard,P. Rensing,L. Rolandi,D. Schlatter, M. Schmelling,O. Schneider,W. Tejessy, A. Venturi,H. Wachsmuth, A. Wagner, Z. Ajaltouni,A. Barr,C. Boyer,A. Falvard, P. Gay, P. Henrard, J. Jousset,B. Michel,S. Monteil, D. Pallin, P. Perret, F. Podlyski,J. Proriol, P. Rosnet

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1996）

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摘要

The four-jet final state is analyzed to search for hadronic decays of pair-produced heavy particles. The analysis uses the ALEPH data collected at LEP in November 1995 at centre-of-mass energies of 130 and 136 GeV, corresponding to a total integrated luminosity of 5.7 pb(-1). An excess of four-jet events is observed with respect to the standard model predictions. In addition, these events exhibit an enhancement in the sum of the two di-jet masses around 105 GeV/c(2). The properties of these events are studied and compared to the expectations from standard processes and to pair production hypotheses.

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关键词

Peak Event, Standard Process, Small Mass Difference, Total Integrate Luminosity, Data Aleph

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