Abstract
Searches for first generation scalar and vector leptoquarks, and for squarks in R-parity violating SUSY models with the direct decay of the squark into Standard Model particles, have been performed using e+e− collisions collected with the OPAL detector at LEP at e+e− centre-of-mass energies between 189 and 209 GeV. No excess of events is found over the expectation from Standard Model background processes. Limits are computed on the leptoquark couplings for different values of the branching ratio to electron–quark final states.
Highlights
The observed symmetry between the lepton and quark sectors in the Standard Model is not yet understood, but could be interpreted as a hint for common underlying structures
This paper presents the results of a search for single production of leptoquarks in e+e− collisions with the OPAL detector at LEP
Since no significant excess is observed, limits on the couplings are calculated for both scalar and vector leptoquarks and for those values of the branching ratio to electron-quark final states that are allowed in the case of chiral couplings
Summary
The observed symmetry between the lepton and quark sectors in the Standard Model is not yet understood, but could be interpreted as a hint for common underlying structures. Two additional assumptions on the leptoquark couplings are made in the following: only the couplings λ within one generation of fermions are assumed to be non-zero (to respect lepton flavour conservation), and only the case of chiral couplings is considered, i.e. it is assumed that the product λRλL of couplings to left-handed and right-handed leptons vanishes (to respect lepton universality). The hadronic photon remnant would disappear down the beam-pipe or add some activity in the forward region of the detector
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