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Search for a new weakly interacting particle

Decamp, D. and Finch, Alexander (1991) Search for a new weakly interacting particle. Physics Letters B, 262 (1). pp. 139-147. ISSN 0370-2693

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Abstract

A search for events of the type e+e−→ℓ+ℓ−X0, where X0 can be any weakly interacting particle which couples to the Z, has been performed with the ALEPH detector at LEP, by searching for acollinear lepton pairs. Such particles can be excluded up to a mass of 7.0 GeV/c2 for a value of the ratio of branching fractions, Br(Z→X0l+l−)/Br(Z→l+l−), greater than 2.5 × 10−3 if the X0 has third component of isospin, I3 greater than and decays to a pair of virtual gauge bosons. When this analysis is combined with the previous results of the Higgs particle searches from ALEPH, this limit can be extended to an X0 mass of 60 GeV/c2.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63796
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 14:54
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:04
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63796

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