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High Energy Physics - Phenomenology

arXiv:1512.06877 (hep-ph)
[Submitted on 21 Dec 2015 (v1), last revised 16 Mar 2016 (this version, v2)]

Title:Beyond Higgs Couplings: Probing the Higgs with Angular Observables at Future $e^+ e^-$ Colliders

Authors:Nathaniel Craig, Jiayin Gu, Zhen Liu, Kechen Wang
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Abstract:We study angular observables in the $e^+e^-\to Z H\to \ell^+ \ell^-\,b\bar{b}$ 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 $\sqrt{s} =$ 240 GeV and 5 (30) ${\rm ab}^{-1}$ integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the 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 $H Z \gamma$ coupling and constraining the "blind spot" in indirect limits on supersymmetric scalar top partners.
Comments: 28 pages, 9 figures. v2: references added, matches published version in JHEP
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Report number: FERMILAB-PUB-15-569-T
Cite as: arXiv:1512.06877 [hep-ph]
  (or arXiv:1512.06877v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1512.06877
Journal reference: JHEP 1603 (2016) 050
Related DOI: https://doi.org/10.1007/JHEP03%282016%29050

Submission history

From: Jiayin Gu [view email]
[v1] Mon, 21 Dec 2015 21:22:28 UTC (1,617 KB)
[v2] Wed, 16 Mar 2016 15:30:18 UTC (1,617 KB)
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