Probing the Higgs with angular observables at future e+e- colliders

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I summarize our recent works on using differential observables to explore the physics potential of future e+e- colliders in the framework of Higgs effective field theory. This proceeding is based upon Refs. 1 and 2. We study angular observables in the e+e- → ZHl+l-bb channel at future circular e+e- colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy s = 240 GeV and 5 (30) ab-1 integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgsstrahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of constraining the "blind spot" in indirect limits on supersymmetric scalar top partners. We also discuss the possibility of using ZZ-fusion at e+e- machines at different energies to probe new operators.

Original languageEnglish (US)
Article number1644005
JournalInternational Journal of Modern Physics A
Issue number33
StatePublished - Nov 30 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 World Scientific Publishing Company.


  • Asymmetries
  • CEPC
  • EFT
  • FCC
  • Higgs boson
  • ILC
  • collider
  • higher-dimensional operators


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