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Four jet final state production in e+ e- collisions at center-of-mass energies of 130-GeV and 136-GeV

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  • ALEPH Collaboration
<mark>Journal publication date</mark>1996
<mark>Journal</mark>Zeitschrift für Physik C Particles and Fields
Issue number1
Number of pages19
Pages (from-to)179-197
<mark>Original language</mark>English


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/c2. The properties of these events are studied and compared to the expectations from standard processes and to pair production hypotheses.