Implications of four-top and top-pair studies on triple-top production

Hou, W.-S.; Kohda, Masaya; Modak, Tanmoy

doi:10.1016/j.physletb.2019.134953

Cited by 31 publications

(47 citation statements)

References 45 publications

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“…It is also worth mentioning the "excess" seen by CMS [53] in the gg → A → tt search at m A ≈ 400 GeV. Such excess can be interpreted within the g2HDM framework [32], if ρ tt ≃ 1.1 and ρ tc ≃ 0.9 with m H AE ≳ 530 GeV and m H ≳ 500 GeV. Note that, for ρ tt ∼ 1, the tZH discovery (or cg → tH → tZA discovery) is not possible due to suppression from BðA → ttÞ (BðH → ttÞ) decay.…”

Section: Discussion and Summarymentioning

confidence: 86%

“…We refrain from a detailed discussion on the extraction procedure for this constraint, but refer the reader to Refs. [10,32]. Following the procedure in Ref.…”

Section: A Parameter Spacementioning

confidence: 99%

“…See Ref. [32] for a recent discussion in the g2HDM context. Presence of both ρ tc and ρ tt can induce gg → A=H → tc [23] and cg → tA=tH → ttt processes [9], which can also be observable at the LHC, but the former may suffer from t þ j mass resolution, which could be close to 200 GeV [54].…”

Section: B Collider Signaturementioning

confidence: 99%

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Production of tZH and tZh in 2HDM: Prospects for discovery at the LHC

Hou

Modak

2020

Phys. Rev. D

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We study the discovery potential of the cg → tA → tZH process at the LHC, where A and H are CP-odd and-even exotic scalars, respectively. The context is the general two Higgs doublet model, where cg → tA is induced by the flavor changing neutral Higgs coupling ρ tc. We find that the process cg → tA → tZH can be discovered for m A ∼ 400 GeV, but would likely require high luminosity running of the LHC. Such a discovery would shed light on the mechanism behind the observed baryon asymmetry of the Universe. We also study cg → tA → tZh, where h is the observed 125 GeV scalar, but find it out of reach at the LHC.

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Section: Discussion and Summarymentioning

confidence: 86%

“…We refrain from a detailed discussion on the extraction procedure for this constraint, but refer the reader to Refs. [10,32]. Following the procedure in Ref.…”

Section: A Parameter Spacementioning

confidence: 99%

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Production of tZH and tZh in 2HDM: Prospects for discovery at the LHC

Hou

Modak

2020

Phys. Rev. D

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“…Heavier m A , m H are possible, but the discovery prospect is reduced due to rapid falloff in parton luminosities. As the ρ tc -induced cg → tH=tA → ttc process [23][24][25][26] (see also Refs. [27][28][29][30]) can be misidentified as ug → tH=tA → ttū due to inefficient c-jet tagging, we outline a procedure to distinguish between the two processes.…”

Section: Introductionmentioning

confidence: 99%

Constraining the t→u flavor changing neutral Higgs coupling at the LHC

2020

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We study the constraints on t → u flavor changing neutral Higgs coupling and how it may be explored further at the LHC. In the general two Higgs doublet model, such transitions can be induced by a nonzero ρ tu Yukawa coupling. We show that such couplings can be constrained by existing searches at the LHC for m H , m A , and m H þ in the sub-TeV range, where H, A, and H þ are the exotic CP-even, CP-odd, and charged scalars. We find that a dedicated ug → tH=tA → ttū search can probe the available parameter space of ρ tu down to a few percent level for 200 GeV ≲ m H , m A ≲ 600 GeV, with discovery possible at high luminosity. Effects of how other extra top Yukawa couplings, such as ρ tc and ρ tt , dilute the sensitivity of the ρ tu probe are discussed.

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“…Since the FCNC couplings are related to non-FCNC couplings, such as t-t-Z coupling, we also consider non-FCNC processes, dijet production, pp → jj, top quark pair production, pp → tt, and four top quark production, pp → tttt to compare them with FCNC processes. Furthermore, since the triple top quark production involves both FCNC and non-FCNC couplings, the constraints from the non-FCNC processes must be considered [9]. This paper is organized as follows.…”

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confidence: 99%

Top FCNC induced by a Z′ boson

Cho

Ko²,

Lee

et al. 2020

Phys. Rev. D

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We consider a Z model where the Z boson couples only to up and top quarks. As a simple setup, one can consider a family-dependent U (1) symmetry, under which only right-handed up-type quarks are charged. After symmetry breaking, the right-handed quarks mix with each other and top flavor-changing neutral currents (FCNCs) mediated by the Z boson can be generated at tree level. We take into account several processes to probe the top FCNCs, and find that the same sign top quark pair production or the triple top quark production is the most capable of testing the top FCNCs. We also consider a few non-FCNC processes to probe the Z boson, for example, dijet production at the LHC. arXiv:1910.05925v1 [hep-ph] 14 Oct 2019investigate the FCNCs through the production of the top quark. In the case of top-Higgs FCNCs via t-q-H (q = u or c) couplings, Atwood et al.[8] discussed three processes, pp → tt(tt), pp → tj(tj), and pp → tjH(tjH), where j denotes a jet and found that the last process is the most capable of yielding the best upper bound on the top FCNCs.In this work, we consider top FCNCs which are generated by a new gauge boson, Z , heavier than the top quark. In search for FCNCs we take into account four FCNC processes, same sign top quark pair production, pp → tt (tt), single top quark production, pp → tj(tj), radiative Z production, pp → tZ j(tZ j), and triple top quark production, pp → ttt (ttt). We calculate cross sections for the four FCNC processes and compare them with each other. We search for the best FCNC process that yields the strongest upper bound on the top FCNC coupling. Since the FCNC couplings are related to non-FCNC couplings, such as t-t-Z coupling, we also consider non-FCNC processes, dijet production, pp → jj, top quark pair production, pp → tt, and four top quark production, pp → tttt to compare them with FCNC processes. Furthermore, since the triple top quark production involves both FCNC and non-FCNC couplings, the constraints from the non-FCNC processes must be considered [9]. This paper is organized as follows. In Sec. 2, we introduce an effective model which provides FCNCs through a Z exchange. As an example of the UV complete model, we consider a U (1) model in which only right-handed up-type quarks are charged. In Sec. 3, we perform numerical analyses for the FCNC processes as well as the non-FCNC processes. Finally, we summarize our results in Sec. 4.

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Implications of four-top and top-pair studies on triple-top production

Cited by 31 publications

References 45 publications

Production of tZH and tZh in 2HDM: Prospects for discovery at the LHC

Production of tZH and tZh in 2HDM: Prospects for discovery at the LHC

Constraining the t→u flavor changing neutral Higgs coupling at the LHC

Top FCNC induced by a Z′ boson

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