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 Barate, D Buskulic, D Decamp, P Ghez, C Goy, J.-P Lees, A Lucotte, M.-N Minard, J.-Y Nief, B Pietrzyk, G Boix, M.P Casado, M Chmeissani, J.M Crespo, M Delfino, E Fernandez, M Fernandez-Bosman, Ll Garrido, E Graugès, A Juste, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 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

FOCARDI, ETTORE;CIULLI, VITALIANO;
1998

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.
1998
420
196
204
R Barate;D Buskulic;D Decamp;P Ghez;C Goy;J.-P Lees;A Lucotte;M.-N Minard;J.-Y Nief;B Pietrzyk;G Boix;M.P Casado;M Chmeissani;J.M Crespo...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/638731
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