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/c2 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 run at 130/136 GeV in 1997. We have found no other explanation for the earlier reported ``four jet anomaly'' than a statistical fluctuation.

Four-jet final state production in e+e− collisions at centre-of-mass energies ranging from 130 to 184 GeV / R., B., D., B., D., D., P., G., C., G., J. P., L., A., L., M. N., M., J. Y., N., B., P., G., B., M. P., C., M., C., J. M., C., M., D., E., F., M., F.B., Ll, G., E., G., A., J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 420:(1998), pp. 196-204. [10.1016/S0370-2693(97)01596-7]

Four-jet final state production in e+e− collisions at centre-of-mass energies ranging from 130 to 184 GeV

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
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/c2 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 run at 130/136 GeV in 1997. We have found no other explanation for the earlier reported ``four jet anomaly'' than a statistical fluctuation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563013
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