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

Research output: Contribution to journalJournal article

Published

Journal publication date1996
JournalZeitschrift für Physik C: Particles and Fields
Journal number1
Volume71
Number of pages19
Pages179-197
Original languageEnglish

Abstract

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.