Lepton-trijet and displaced vertex searches for heavy neutrinos at future electron-proton colliders

Antusch, Stefan; Fischer, Oliver; Hammad, A.

doi:10.1007/jhep03(2020)110

Cited by 25 publications

(13 citation statements)

References 39 publications

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“…At the ILC it may also be possible to distinguish LNC and LNV W ± exchange channels between the e + e − pair by measuring the asymmetry of the outgoing lepton pseudorapidity distribution [50]. Finally, the proposed Large Hadron-Electron Collider (LHeC) LHC upgrade may also provide competitive constraints for m N > m Z [68,70,71]. An overview of proposed collider sensitivities is given in Ref.…”

Section: High-energy Collider Searchesmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

171

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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Section: High-energy Collider Searchesmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

171

138

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“…Prominent examples among these studies are searches for sterile neutrinos, for instance via lepton-trijets and displaced vertex signatures [40], heavy scalar particles with masses around the electroweak scale [41], and in general models with final states that look like 'hadronic noise' in protonproton collisions [42,43].…”

Section: Beyond the Standard Model Searchesmentioning

confidence: 99%

An experiment for electron-hadron scattering at the LHC

et al. 2022

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Novel considerations are presented on the physics, apparatus and accelerator designs for a future, luminous, energy frontier electron-hadron (eh) scattering experiment at the LHC in the thirties for which key physics topics and their relation to the hadron-hadron HL-LHC physics programme are discussed. Demands are derived set by these physics topics on the design of the LHeC detector, a corresponding update of which is described. Optimisations on the accelerator design, especially the interaction region (IR), are presented. Initial accelerator considerations indicate that a common IR is possible to be built which alternately could serve eh and hh collisions while other experiments would stay on hh in either condition. A forward-backward symmetrised option of the LHeC detector is sketched which would permit extending the LHeC physics programme to also include aspects of hadron-hadron physics. The vision of a joint eh and hh physics experiment is shown to open new prospects for solving fundamental problems of high energy heavy-ion physics including the partonic structure of nuclei and the emergence of hydrodynamics in quantum field theory while the genuine TeV scale DIS physics is of unprecedented rank.

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“…In particular, in low-scale see-saw models with two sterile neutrinos, the mixing with SM neutrinos is expected to be very weak, leading to a displaced vertex from the decay of the heavy neutrino. A search [12,13] for − → − + 3 , based on BDT optimization, assuming a tracking resolution of 8 m and a sensitivity of 40 m for the displacement of the vertex, shows that the constraint on the mixing angles Θ 2 and Θ 2 can be very significantly improved over current limits (Fig. 2, left).…”

Section: Long-lived Particles and Dark Sectormentioning

confidence: 99%

“…Left: Sensitivity of the LFV lepton-trĳet searches and the displaced vertex searches (at 95 % C.L. )[12] compared to the current exclusion limits from other colliders; Right: Limit Contours for the case of singly charged Higgs for FCC-eh and LHeC[21]. An unpolarized beam and a 10% systematic uncertainty for background yields is assumed.…”

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confidence: 99%

Beyond Standard Model Physics at the LHeC and the FCC-eh

Azuelos¹,

D’Onofrio²,

Fischer³

et al. 2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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Thanks to the low background, negligible pileup and generally clean environement at colliders, a rich program of physics beyond the Standard Model (BSM) can be explored with precision measurements, complementing searches at LHC and future colliders. We review some recent studies aimed at evaluating the reach and sensitivity of the next generation colliders, the LHeC and FCC-eh, in probing a few BSM models, in particular compressed scenarios of supersymmetry, long-lived particles and dark sector, charged Higgs and leptoquarks.

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Lepton-trijet and displaced vertex searches for heavy neutrinos at future electron-proton colliders

Cited by 25 publications

References 39 publications

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

An experiment for electron-hadron scattering at the LHC

Beyond Standard Model Physics at the LHeC and the FCC-eh

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