A direct measurement of the invisible width of the Z from single photon counting

Buskulic, D. and Finch, Alexander (1993) A direct measurement of the invisible width of the Z from single photon counting. Physics Letters B, 313 (3-4). pp. 520-534. ISSN 0370-2693

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The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb−1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region | cosθγ | < 0.74 of the electromagnetic calorimeter. It is shown that this number of events cab be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 45 ± 34(stat.) ± 34(syst.) MeV. Using Z. resonance parameters derived by ALEPH, the corresponding number oflight neutrino generations is found to be 2.68 ± 0.20(stat.) ± 0.20(syst.).

Item Type: Journal Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Departments: Faculty of Science and Technology > Physics
ID Code: 64101
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 15:00
Refereed?: Yes
Published?: Published
Last Modified: 30 Sep 2019 17:25
URI: https://eprints.lancs.ac.uk/id/eprint/64101

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