Abstract
We study angular observables in the \( {e}^{+}{e}^{-}\to ZH\to {\ell}^{+}{\ell}^{-}b\overline{b} \) 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 \( \sqrt{s}=240 \) GeV and 5 (30) ab−1 integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for he Higgs-strahlung 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 both probing BSM corrections to the HZγ coupling and constraining the “blind spot” in indirect limits on supersymmetric scalar top partners.
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Craig, N., Gu, J., Liu, Z. et al. Beyond Higgs couplings: probing the Higgs with angular observables at future e + e − colliders. J. High Energ. Phys. 2016, 50 (2016). https://doi.org/10.1007/JHEP03(2016)050
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DOI: https://doi.org/10.1007/JHEP03(2016)050