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.

Observation of monojet events and tentative interpretation / Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Minard, M.n., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.m., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Gaitan, V., Garrido, L., Martinez, M., Mattison, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 334:1-2(1994), pp. 244-252. [10.1016/0370-2693(94)90619-X]

Observation of monojet events and tentative interpretation

CREANZA D;IASELLI G;MAGGI G;
1994

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.
1994
Observation of monojet events and tentative interpretation / Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Minard, M.n., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.m., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Gaitan, V., Garrido, L., Martinez, M., Mattison, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 334:1-2(1994), pp. 244-252. [10.1016/0370-2693(94)90619-X]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/1610
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