Observation of mono - jet events and tentative interpretation

Buskulic, D.; Casper, D.; De Bonis, I.; Decamp, D.; Ghez, Philippe; Goy, C.; Lees, J.P.; Minard, M.N.; Odier, P.; Pietrzyk, B.

doi:10.1016/0370-2693(94)90619-X

Observation of mono - jet events and tentative interpretation

ALEPH

Collaboration

Jun, 1994

11 pages

Published in:

Phys.Lett.B 334 (1994) 244-252

DOI:

10.1016/0370-2693(94)90619-X

Report number:

CERN-PPE-94-093,
CERN-PPE-94-93

Experiments:

CERN-LEP-ALEPH

View in:

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Abstract: (Elsevier)

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−→γ*vv¯ , with γ*→ff¯ . Two events are hadronic, the third one being an e + e − pair. All monojet masses are in excess of 3 GeV/ c 2 , and two of the event have large transverse momenta: 18.5 and 20.3 GeV/ c . These kinematic characteristics are quite unlikely in the process e+e−→γ*vv¯ . The probability of their occurence increases substantially when processes involving further Z or W exchanges are taken into account, but still remains at the 5% level.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
jet: electroproduction
electroproduction: jet
final state: (1jet missing-energy)
(1jet missing-energy): final state
transverse momentum: high
kinematics

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