Probing triple-Higgs productions via $4b2\gamma$ decay channel at a 100 TeV hadron collider

Journal Article · 10 January 2016 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.93.013007 · OSTI ID:1260148

Chen, Chien-Yi ^[1]; Yan, Qi-Shu ^[2]; Zhao, Xiaoran ^[3]; Zhao, Zhijie ^[4]; Zhong, Yi-Ming ^[5]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Victoria, BC (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
2. Univ. of Chinese Academy of Sciences (CAS), Beijing (China); Peking Univ., Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China). Center for future high energy physics
3. Univ. of Chinese Academy of Sciences (CAS), Beijing (China)
4. Univ. of Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Siegen, Siegen (Germany)
5. Stony Brook Univ., NY (United States)

We report that the quartic self-coupling of the Standard Model Higgs boson can only be measured by observing the triple-Higgs production process, but it is challenging for the LHC Run 2 or International Linear Collider (ILC) at a few TeV because of its extremely small production rate. In this paper, we present a detailed Monte Carlo simulation study of the triple-Higgs production through gluon fusion at a 100 TeV hadron collider and explore the feasibility of observing this production mode. We focus on the decay channel HHH →$$b\bar{b}$$$$b\bar{b}$$γγ, investigating detector effects and optimizing the kinematic cuts to discriminate the signal from the backgrounds. Our study shows that, in order to observe the Standard Model triple-Higgs signal, the integrated luminosity of a 100 TeV hadron collider should be greater than 1.8×10⁴ ab^₋1. We also explore the dependence of the cross section upon the trilinear (λ₃) and quartic (λ₄) self-couplings of the Higgs. Ultimately, we find that, through a search in the triple-Higgs production, the parameters λ₃ and λ₄ can be restricted to the ranges [₋1,5] and [₋20,30], respectively. We also examine how new physics can change the production rate of triple-Higgs events. For example, in the singlet extension of the Standard Model, we find that the triple-Higgs production rate can be increased by a factor of O(10).

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: SC0012704; AC02-76SF00515; AC02-98CH10886; SC0008061
• OSTI ID: 1260148
• Report Number(s): BNL--112256-2016-JA; KA2401012
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 1 Vol. 93; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English