New low-energy leptoquark interactions

M. Hirsch, H. V. Klapdor-Kleingrothaus, S. G. Kovalenko

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


We discuss an extension of the standard model (SM) with vector and scalar leptoquarks. The renormalizable leptoquark Lagrangian consistent with the SM gauge symmetry is presented including the leptoquark-Higgs interactions previously not considered in the literature. We discuss the importance of these new interactions for leptoquark phenomenology. After the electro-weak symmetry breaking they generate non-trivial leptoquark mass matrices. These lead to mixing between different SU(2)L-multiplets of the leptoquarks and induce at low energies new effective 4-fermion lepton-quark vertices. The latter affect the standard leptoquark phenomenology. We discuss constraints on these interactions from the helicity-suppressed π → ν + e decay.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
Publication statusPublished - 20 Jun 1996
Externally publishedYes


  • Effective interaction
  • Higgs
  • Leptoquarks
  • Non-chiral
  • Pion decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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