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

Research output: Chapter in Book/Report/Conference proceedingChapter


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 fore- cast 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 comple- mentary 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)
Title of host publicationThe Future of High Energy Physics
Subtitle of host publicationSome Aspects
PublisherWorld Scientific Publishing Co. Pte Ltd
Number of pages12
ISBN (Electronic)9789813220089
ISBN (Print)9789813209916
StatePublished - Apr 1 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.


  • Asymmetries
  • CEPC
  • Collider
  • EFT
  • FCC
  • Higgs boson
  • Higher- dimensional operators
  • ILC


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