Probing the Higgs with angular observables at future e+e– colliders
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
In this paper, 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–b$$\bar{b}$$ 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. Finally, we also discuss the possibility of using ZZ-fusion at e+e– machines at different energies to probe new operators.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1358111
- Report Number(s):
- FERMILAB-CONF-16-681-T; 1501170
- Journal Information:
- International Journal of Modern Physics A, Vol. 31, Issue 33; ISSN 0217-751X
- Publisher:
- World ScientificCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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