Heavy Neutral Leptons at Beam Dump Experiments of Future Lepton Colliders

Giffin, Pierce; Gori, Stefania; Tsai, Yu-Dai; Tuckler, Douglas

doi:10.48550/arxiv.2206.13745

Cited by 6 publications

(10 citation statements)

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“…However once the HNL mass exceeds m τ , there are no limits from the old fixed target experiments where sufficient numbers of B mesons were not produced. This will happen however at the high luminosity LHC where experiments at the FPF will probe HNLs with mass up to m B [5], as well as at future lepton colliders [52,53]. In the interim, new searches for GeV mass HNLs will be carried out with the LHCb upgrade [54], and NA62 in beam dump mode [55] as well as FASER 2 [56,57], with proposed experiments such as CODEX-B, MATHUSLA and SHiP to hopefully follow [28,29].…”

Section: Results and Conclusionmentioning

confidence: 99%

Blast from the past II: Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment

2022

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We revisit the search for heavy neutral leptons with the Big European Bubble Chamber in the 1982 proton beam dump experiment at CERN, focussing on those heavier than the kaon and mixing only with the tau neutrino, as these are far less constrained than their counterparts with smaller mass or other mixings. Recasting the previous search in terms of this model and including additional production and decay channels yields the strongest bounds to date, up to the tau mass. This applies also to our updated bounds on the mixing of heavy neutral leptons with the electron neutrino.

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Section: Results and Conclusionmentioning

confidence: 99%

Blast from the past II: Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment

2022

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“…1, we present the HNL production cross sections including next-to-leading order (NLO) QCD corrections (factoring out the squared mixing parameter |U e | 2 ) as a function of the HNL mass m N for ep collisions with beam energies as E p = 100, 275 GeV and E e = 10, 18 GeV, respectively, adopting the CT18NNLO parton distribution functions [42]. Similar calculations have been performed in ep collisions at the HERA energies [43][44][45] as well as for the proposed LHeC [46][47][48] and beam dump experiments at future lepton colliders [49]. The production cross sections are the same for the Dirac and Majorana HNLs, as they share the same gauge couplings in Eq.…”

Section: Heavy Neutral Leptonsmentioning

confidence: 94%

Heavy Neutral Leptons at the Electron-Ion Collider

Batell¹,

Ghosh²,

Han³

et al. 2022

Preprint

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The future Electron-Ion Collider (EIC) at Brookhaven National Laboratory, along with its primary capacity to elucidate the nuclear structure, will offer new opportunities to probe physics beyond the Standard Model coupled to the electroweak sector. Among the best motivated examples of such new physics are new heavy neutral leptons (HNLs), which are likely to play a key role in neutrino mass generation and lepton number violation. We study the capability of the EIC to search for HNLs, which can be produced in electronproton collisions through charged current interactions as a consequence of their mixing with light neutrinos. We find that, with the EIC design energy and integrated luminosity, one is able to probe HNLs in the mass range of 1 GeV−100 GeV with mixing angles down to the order of 10 −4 − 10 −3 through the prompt decay, and 10 −6 − 10 −4 via the displaced decay signatures. We also consider the invisible mode where an HNL is undetected or decaying to dark sector particles. One could potentially probe heavy HNLs for mixing angles in the window 10 −3 − 10 −2 , provided SM background systematics can be brought under control. These searches are complementary to other probes of HNLs, such as neutrino-less double-β decay, meson decay, fixed-target, and high-energy collider experiments.

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“…Like the light kk sterile neutrino states (light bulk neutrinos), which mix with the active neutrinos, we assume that the heavy right-handed partners (heavy bulk neutrinos) also propagate in extra dimensions. In laboratory experiments, these can be produced in the chirality flipping scattering processes through either the dipole interactions [20,[47][48][49][50][51][52][53][54][55][56][57][58][59][60] or scalar interactions [61,62], often called the up-scattering processes. The heavy bulk neutrinos produced in the final state can be related to the extra dimensions at all energy scales.…”

Section: Jhep01(2023)052mentioning

confidence: 99%

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

Khan

2023

J. High Energ. Phys.

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We explore the possibility of relating extra dimensions with light and heavy Dirac-type neutral leptons and develop a framework for testing them in various laboratory experiments. The Kaluza-Klein modes in the large extra dimension models of the light neutral leptons could mix with the standard model neutrinos and produce observable effects in the oscillation experiments. We show that the chirality flipping up-scattering processes occurring through either neutrino magnetic dipole moment or the weakly coupled scalar interactions can also produce heavy Kaluza-Klein modes of the corresponding right-handed neutral leptons propagating in one or more extra dimensions. However, to conserve the four- dimensional energy-momentum, their masses must be below the maximum energy of the neutrinos in the initial state. The appreciable size of extra dimensions connected with these heavy neutral leptons can thus affect the cross-sections of these processes. This framework applies to any up-scattering process. Our work here focuses only on its application to the coherent elastic neutrino-nucleus scattering process. We derive constraints on the size of extra dimensions using the COHERENT data in oscillation and up-scattering processes. For model with one large extra dimension for the light neutral leptons, we obtain the limits, R ~ 3 μm (NH) and R ~ 2.5 μm (IH), on the size of extra dimension corresponding to the absolute mass limit, m0 ≤ 3 × 10−3 eV at 90% C.L. from the short-baseline oscillations. Using the up-scattering process for heavy neutral leptons, we obtain new parameter spaces between the size of extra dimensions and parameters of the dipole or scalar interactions.

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Heavy Neutral Leptons at Beam Dump Experiments of Future Lepton Colliders

Cited by 6 publications

References 0 publications

Blast from the past II: Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment

Blast from the past II: Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment

Heavy Neutral Leptons at the Electron-Ion Collider

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

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