Hunting for heavy majorana neutrinos with lepton number violating signatures at LHC

Guo, Chao; Guo, S.; Han, Zhi-Long; Li, Bin; Liao, Yi

doi:10.1007/jhep04(2017)065

Cited by 17 publications

(12 citation statements)

References 229 publications

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“…In this work, instead of looking for direct heavy neutrino production, we have considered the production of the neutrinophilic charged Higgs (H ± ) and explored its various possible decay modes. There are some earlier studies on the charged Higgs in similar scenarios emphasising its decay into a charged lepton and a heavy neutrino in the process [44]. We show that even cleaner signals can be obtained using this decay mode with higher lepton multiplicity where the SM background is practically non-existent.…”

Section: Introductionmentioning

confidence: 64%

“…These constraints are also reflected upon our choice of the neutrinophilic Higgs VEV, v ν . It has been observed and also verified by us that v ν can be ∼ 10 −2 GeV [44] at the smallest, if the neutrino oscillation data and the LFV constraints are to be satisfied simultaneously, the most stringent constraint arising from the non-observation of BR(µ → eγ) [65,66]. This constraint puts the spontaneously breaking Z 2 scenario in jeopardy.…”

Section: Constraints and Benchmark Pointsmentioning

confidence: 93%

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Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels

et al. 2018

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We consider a neutrinophilic Higgs scenario where the Standard Model is extended by one additional Higgs doublet and three generations of singlet right-handed Majorana neutrinos. Light neutrino masses are generated through mixing with the heavy neutrinos via the Type-I seesaw mechanism when the neutrinophilic Higgs gets a vacuum expectation value (VEV). The Dirac neutrino Yukawa coupling in this scenario can be sizable compared to those in the canonical Type-I seesaw mechanism owing to the small neutrinophilic Higgs VEV giving rise to interesting phenomenological consequences. We have explored various signal regions likely to provide a hint of such a scenario at the LHC as well as at future e þ e − colliders. We have also highlighted the consequences of light neutrino mass hierarchies in collider phenomenology that can complement the findings of neutrino oscillation experiments.

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Section: Introductionmentioning

confidence: 64%

Section: Constraints and Benchmark Pointsmentioning

confidence: 93%

Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels

et al. 2018

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“…The prospects of detecting signals of heavy Majorana neutrinos on hadron colliders have been thoroughly explored [15][16][17][18][19][20][21][22][23][24][25][26][27]. Both ATLAS and CMS experiments at the LHC have set limits on the mixing parameters for heavy Majorana neutrino masses between 100 and 500 GeV [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

A potential scenario for Majorana neutrino detection at future lepton colliders

Zhang

2019

J. High Energ. Phys.

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The existence of Majorana neutrinos must lead to lepton-number violating processes, and the Majorana nature of neutrinos can only be experimentally verified only via lepton-number violating processes. We propose a new approach to search for Majorana neutrinos at future electron-positron colliders by exploiting this feature. We investigate the ∆L = 2 like-sign dilepton production and find that lepton colliders with different centerof-mass (c.m.) energies have comparative advantages in resonant production of a Majorana neutrino in either light neutrino mass range or heavy mass range. At the future Circular Electron-Positron Collider (CEPC), with 250 GeV c.m. energy and 5 ab −1 integrated luminosity, we find that there could be more significant sensitivity for resonant production of a Majorana neutrino in the mass range of 5-80 GeV than previous results at LEP2 or LHC. At the 1 TeV ILC with 1 ab −1 integrated luminosity, it has better sensitivity while the neutrino mass is larger than 250 GeV.

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“…With an elementary scalar the SM is also confronted with issues such as gauge hierarchy and flavor problems. To solve or relax some of these issues, there have been various theoretical attempts beyond the SM whose phenomenologies have been extensively studied, such as in the minimal supersymmetric model (MSSM) [9][10][11][12], two Higgs doublet models (THDM) [13][14][15][16][17][18], little Higgs models [19][20][21][22][23], and composite Higgs models [24][25][26], to mention a few with a modified Higgs sector.…”

Section: Introductionmentioning

confidence: 99%

Higgs production at future e+e− colliders in the Georgi-Machacek model

Han

Liao

2018

J. High Energ. Phys.

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We study how the dominant single and double SM-like Higgs (h) production at future e + e − colliders is modified in the Georgi-Machacek (GM) model. On imposing theoretical, indirect and direct constraints, significant deviations of h-couplings from their SM values are still possible; for instance, the Higgs-gauge coupling can be corrected by a factor κ hV V ∈ [0.93, 1.15] in the allowed parameter space. For the Higgs-strahlung e + e − → hZ and vector boson fusion processes e + e − → hνν, he + e − , the cross section could increase by 32% or decrease by 13%. In the case of associated production with a top quark pair e + e − → htt, the cross section can be enhanced up to several times when the custodial triplet scalar H 0 3 is resonantly produced. In the meanwhile, the double Higgs production e + e − → hhZ (hhνν) can be maximally enhanced by one order of magnitude at the resonant H 0 1,3 production. We also include exclusion limits expected from future LHC runs at higher energy and luminosity and discuss their further constraints on the relevant model parameters. We find that the GM model can result in likely measurable deviations of Higgs production from the SM at future e + e − colliders.

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Hunting for heavy majorana neutrinos with lepton number violating signatures at LHC

Cited by 17 publications

References 229 publications

Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels

Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels

A potential scenario for Majorana neutrino detection at future lepton colliders

Higgs production at future e+e− colliders in the Georgi-Machacek model

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