Third-generation leptoquark decays and collider searches

Details Third-generation leptoquark decays and collider searches Third-generation leptoquark decays and collider searches

1997-07-27

arxiv.org/abs/hep-ph/9707486v1

Phys.Lett. B411 (1997) 107-111

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, LaTeX, 2 separate postscript figures

Scientific paper

10.1016/S0370-2693(97)01015-0

Collider searches for first-, second-, and third-generation scalar (S) or vector (V) leptoquarks (LQs) focus on the quark-lepton decay modes S,V -> q l. For SU(2)-doublet and -triplet leptoquarks with a sufficiently large splitting between the components, decays involving real W-boson emission (such as S_2^{(+5/3)} -> S_2^{(+2/3)} W^{+} and others) become possible and can change the patterns of leptoquark decays. For third-generation leptoquarks, where these mass splittings might be large, such modes could dominate certain leptoquark decays as they are (if kinematically allowed) guaranteed to be of order g^2 where g is the electroweak coupling. We calculate the decay rates for all such processes involving SU(2)-doublet and triplet, scalar and vector leptoquarks. Standard limits on mass splittings from precision electroweak measurements imply that only such decays involving SU(2)-doublet scalar LQs are likely kinematically possible.

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