Collider constraints on interactions of dark energy with the Standard Model

We study models in which a light scalar dark energy particle couples to the gauge fields of the electroweak force, the photon, Z and W bosons. Our analysis applies to a large class of interacting dark energy models, including those in which the dark energy mass can be adjusted to evade fifth-force bounds by the so-called chameleon mechanism. We conclude that--with the usual choice of Higgs sector--electroweak precision observables are screened from the indirect effects of dark energy, making such corrections effectively unobservable at present-day colliders, and limiting the dark energy discovery potential of any future International Linear Collider. We show that a similar screening effect applies to processes mediated by flavour-changing neutral currents, which can be traced to the Glashow-Iliopoulos-Maiani mechanism. However, Higgs boson production at the Large Hadron Collider via weak boson fusion may receive observable corrections.
Comment: 39 pages, 8 figures, uses ioplatex.sty and feynmp. v2: Matches version accepted by JHEP; extended discussion of straight corrections, summarized in the text and described in detail in a new Appendix A. Conclusions unchanged