The European Physical Journal C

, Volume 70, Issue 4, pp 1071–1090 | Cite as

Constraints on two-lepton two-quark operators

  • Michael Carpentier
  • Sacha DavidsonEmail author
Regular Article - Theoretical Physics


Physics from beyond the Standard Model, such as leptoquarks, can induce four fermion operators involving a quark, an anti-quark, a lepton and an anti-lepton. We update the (flavour-dependent) constraints on the coefficients of such interactions, arising from collider searches for contact interactions, meson decays and other rare processes. We then make naive estimates for the magnitude of the coefficients, as could arise in texture models or from inverse hierarchies in the kinetic term coefficients. These “expectations” suggest that rare kaon decays could be a good place to look for such operators.


Contact Interaction Charged Lepton Index Combination Fermion Operator Meson Decay 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  1. 1.IPNL, Université Lyon 1, Université de LyonCNRS/IN2P3Villeurbanne cedexFrance

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