The four jet topology is analysed in the ALEPH data taken between November 1995 and October 1997, at centre-of-mass energies ranging from 130 to 184 GeV, While an unexpected accumulation of events with a dijet mass sum around 105 GeV/c(2) had been observed during the first run in 1995 at 130/136 GeV, corresponding to an integrated luminosity of 5.7 pb(-1), no significant differences between data and standard model prediction is seen, either in the high energy runs (81.1 pb(-1) taken at centre-of-mass energies from 161 to 184 GeV) or in the 7.1 pb(-1) recorded during a new short fun at 130/136 GeV in 1997, We have found no other explanation for the earlier reported "four jet anomaly" than a statistical fluctuation. (C) 1998 Published by Elsevier Science B.V.
Four-jet final state production in e(+)e(-) collisions at centre-of-mass energies ranging from 130 to 184 GeV
SELVAGGI, Giovanna;NUZZO, Salvatore Vitale;DE PALMA, Mauro
1998-01-01
Abstract
The four jet topology is analysed in the ALEPH data taken between November 1995 and October 1997, at centre-of-mass energies ranging from 130 to 184 GeV, While an unexpected accumulation of events with a dijet mass sum around 105 GeV/c(2) had been observed during the first run in 1995 at 130/136 GeV, corresponding to an integrated luminosity of 5.7 pb(-1), no significant differences between data and standard model prediction is seen, either in the high energy runs (81.1 pb(-1) taken at centre-of-mass energies from 161 to 184 GeV) or in the 7.1 pb(-1) recorded during a new short fun at 130/136 GeV in 1997, We have found no other explanation for the earlier reported "four jet anomaly" than a statistical fluctuation. (C) 1998 Published by Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
