Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the Z

Details Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the Z Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the Z

1994-06-21

arxiv.org/abs/hep-ph/9406354v1

Phys.Lett.B336:100-106,1994; ERRATUM-ibid.B338:522-523,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages + 3 Figures (available upon request), Latex file, CERN preprint CERN-TH.7280/94

Scientific paper

10.1016/0370-2693(94)00927-9

The vertex corrections to the leptonic partial widths of the $Z$ induced by leptoquarks that couple leptons to the top quark are considered. We obtain stringent bounds on the parameter space of the masses and Yukawa couplings of these leptoquarks, using the latest information on the $Z \rightarrow l^+l^-$ decay widths measured at LEP. Leptoquarks coupling with electroweak strength to top quarks are constrained to be heavier than several hundred GeV, at 95$\%$ C.L. As a consequence, such leptoquarks cannot make a significant contribution to lepton asymmetries, $\tau$ polarisation asymmetries or $A_{LR}$.

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