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Direct Higgs-top CP-phase measurement with t(t)over-barh at the 14TeV LHC and 100TeV FCC

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Title
Direct Higgs-top CP-phase measurement with t(t)over-barh at the 14TeV LHC and 100TeV FCC
Author(s)
Dorival Gonçalves; Jeong Han Kim; Kyoungchul Kong; Yongcheng Wu
Publication Date
2022-01-27
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2022, no.1, pp.1 - 17
Publisher
SPRINGER
Abstract
© The Authors. Article funded by SCOAP3.The study of the Higgs boson's properties is a cornerstone of the LHC and future collider programs. In this paper, we examine the potential to directly probe the Higgs-top interaction strength and CP-structure in the t (t) over barh channel with the Higgs boson decaying to bottom-quark pairs and top-quarks in the di-leptonic mode. We adopt the BDRS algorithm to tag the boosted Higgs and exploit the M-2-assisted reconstruction to compute observables sensitive to the CP-phase at the t (t) over bar rest frame, where the new physics sensitivity can be enhanced. Performing a side-band analysis at the LHC to control the continuum t (t) over barb (b) over bar background, we find that the Higgs-top strength and CP-phase can be probed up to delta(kappa t) less than or similar to 20% and |alpha| less than or similar to 36 degrees at 95% CL, respectively. We also derive that a similar analysis at a 100TeV future collider could further improve the precision to delta(kappa t) less than or similar to 1% and |alpha| less than or similar to 1.5 degrees, where the CP-odd observables play a crucial role, boosting the sensitivity on the CP-phase.
URI
https://pr.ibs.re.kr/handle/8788114/11203
DOI
10.1007/JHEP01(2022)158
ISSN
1126-6708
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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