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OBSERVATION OF MONOJET EVENTS AND TENTATIVE INTERPRETATION

BUSKULIC, D; CASPER, D; DEBONIS, I; DECAMP, D; GHEZ, P; GOY, C; ... ZOBERNIG, G; + view all (1994) OBSERVATION OF MONOJET EVENTS AND TENTATIVE INTERPRETATION. PHYS LETT B , 334 (1-2) 244 - 252.

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Abstract

A data sample corresponding to almost two million hadronic Z decays collected by the ALEPH detector at LEP has been searched for monojet events. Three events were found, in agreement with the expectation from the process e+e- --> gamma*nunuBAR, with gamma* --> ffBAR. Two events are hadronic, the third one being an e+e- pair. All monojet masses are in excess of 3 GeV/c2, and two of the events have large transverse momenta: 18.5 and 20.3 GeV/c. These kinematic characteristics are quite unlikely in the process e+e- --> gamma*nunuBAR. The probability of their occurrence increases substantially when processes involving further Z or W exchanges are taken into account, but still remains at the 5% level.

Type:Article
Title:OBSERVATION OF MONOJET EVENTS AND TENTATIVE INTERPRETATION
Keywords:NEUTRAL HIGGS BOSON, E+E ANNIHILATION, MONTE-CARLO, Z0 DECAY, SEARCH, LEP, PARTICLES, DETECTOR, LIMITS, ALEPH
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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