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Study of the Four-Jet Anomaly Observed at LEP Centre-of-Mass Energies of 130 and 136 GeV

par Abreu, Pedro;Bertrand, Daniel ; [et al.]
Référence Physics letters. Section B, 448, page (311-319)
Publication Publié, 1999

Article révisé par les pairs

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Résumé :

The four-jet events collected by DELPHI during the special LEP run at centre-of-mass energies of 130 and 136 GeV in 1997 with an integrated luminosity of 5.9pb-1 are analysed. Their rate and the distributions of their di-jet masses, their smallest jet charges, and their di-jet charge separations all agree well with Standard Model predictions. Thus the hypothesis of pair production of a new particle with a sum of di-jet masses around 105 GeV/c2 is not supported. The combined result of the four LEP collaborations refuting this hypothesis at over 99% confidence level is also given. © 1999 Published by Elsevier Science B.V. All rights reserved.