The Present and Future Status of Heavy Neutral Leptons

Abdullahi, Asli; Alzas, Pablo Barham; Batell, Brian; Boyarsky, Alexey; Carbajal, Saneli; Chatterjee, A.; Crespo-Anadon, Jose I.; Deppisch, Frank F.; Roeck, A. De; Drewes, Marco; Gago, A. M.; Suarez, R. Gonzalez; Goudzovski, E.; Hatzikoutelis, A.; Hufnagel, Marco; Ilten, P.; Izmaylov, A.; Kelly, Kevin J.; Klarić, Juraj; Kulkarni, Suchita; Lamoureux, Mathieu; Lanfranchi, G.; López‐Pavón, Jacobo; Mikulenko, Oleksii; Mooney, M.; Nemevšek, Miha; Ovchynnikov, Maksym; Pascoli, Silvia; Plestid, Ryan; Darwish, M. R.; Redi, F.; Ruchayskiy, Oleg; Ruiz, Richard; Shaposhnikov, Mikhail; Shoemaker, Ian M.; Shrock, Robert; Sousa, A. A. T. C. de; Remortel, N. Van; Syvolap, Vsevolod; Takhistov, Volodymyr; Tastet, Jean‐Loup; Timiryasov, Inar; Vincent, Aaron C.; Yu, J.

doi:10.48550/arxiv.2203.08039

Cited by 22 publications

(47 citation statements)

References 521 publications

(931 reference statements)

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“…The reason for choosing this production mode is straightforward: since we are interested in long lifetimes, we focus on scenarios with no enhancement from R (and thus, no constraints from LEP). Then, all of the N h production modes at colliders from the standard Seesaw [9,10,69] are strongly suppressed. In light of this, the best bet for heavy neutrino production comes from the Anisimov-Graesser operator, as can be seen in Eq.…”

Section: Searches For Non-pointing Photons At the Lhcmentioning

confidence: 99%

Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches

Delgado¹,

Duarte²,

Jones-Perez³

et al. 2022

Preprint

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The Dimension-5 Seesaw Portal is a Type-I Seesaw model extended by d = 5 operators involving the sterile neutrino states, leading to new interactions between all neutrinos and the Standard Model neutral bosons. In this work we focus primarily on the implications of these new operators at the GeV-scale. In particular, we recalculate the heavy neutrino full decay width, up to three-body decays. We also review bounds on the dipole operator, and revisit LEP constraints on its coefficient.Finally, we turn to heavy neutrino pair production from Higgs decays, where the former are long-lived and disintegrate into a photon and a light neutrino. We probe this process by recasting two ATLAS searches for non-pointing photons, showing the expected event distribution in terms of arrival time t γ and pointing variable |∆z γ |.

show abstract

Section: Searches For Non-pointing Photons At the Lhcmentioning

confidence: 99%

Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches

Delgado¹,

Duarte²,

Jones-Perez³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Among the portals, an attractive option is heavy neutral leptons (HNLs) -hypothetical fermion particles coupled to the Higgs doublet H and the left SM lepton doublet L α , α = e, µ, τ (see [2] and references therein):…”

Section: Introductionmentioning

confidence: 99%

“…problems beyond the SM does not fix the HNL mass scale; it may vary from O(MeV) to 10 15 GeV (see [2,[5][6][7] and references therein). HNLs with masses m N < m Z may be copiously produced in decays of heavy bosons Z and W , and searched for at the LHC by their decays into charged particles.…”

Section: Introductionmentioning

confidence: 99%

“…Thanks to these factors, in particular, the amount of produced B mesons at FCC-hh will be around 30 times larger that at the LHC. So far, however, the sensitivity of FCC-hh to HNLs from B mesons has not been studied in the literature, see [2,18,32]. In this paper, we study the sensitivity of FCC-hh to HNLs by considering additional detectors, similar to the proposals of the LHC-based experiments.…”

Section: Introductionmentioning

confidence: 99%

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Exploring the potential of FCC-hh to search for particles from $B$ mesons

Boyarsky¹,

Mikulenko²,

Ovchynnikov³

et al. 2022

Preprint

Self Cite

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The Future Circular Collider (FCC-hh) is a proposed successor of the Large Hadron Collider (LHC). FCC-hh would push both the energy and intensity frontiers of searches for new physics particles. In particular, due to higher energy and luminosity than at the LHC, at FCC-hh there would be produced around 30 times larger amount of B mesons and 120 times of W bosons, which then may decay into feebly interacting particles. In this paper we demonstrate the potential of FCC-hh by studying its sensitivity to heavy neutral leptons (HNLs) with masses m N < m B . We consider various locations of a displaced decay volume embedded in the planned infrastructure of FCC-hh. We demonstrate that FCC-hh may substantially improve the reach of the parameter space of HNLs as compared to the searches proposed at the LHC.

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“…The first possibility comes after diagonalizing the Seesaw ν L − ν R mass matrix, such that the heavy states N h , which are mostly ν R , can mix with the active ν L . The N h are then no longer sterile, behaving as very weakly coupled particles, with consequences in collider searches and low energy processes like neutrinoless double beta decay [8][9][10]. A second possibility that does not necessarily involve the Seesaw arises when including the ν R fields in an effective field theory (EFT) as low energy degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the dimension-5 seesaw portal and impact of exotic Higgs decays on non-pointing photon searches

Delgado

Duarte

Jones-Pérez

et al. 2022

J. High Energ. Phys.

View full text Add to dashboard Cite

The Dimension-5 Seesaw Portal is a Type-I Seesaw model extended by d = 5 operators involving the sterile neutrino states, leading to new interactions between all neutrinos and the Standard Model neutral bosons. In this work we focus primarily on the implications of these new operators at the GeV-scale. In particular, we recalculate the heavy neutrino full decay width, up to three-body decays. We also review bounds on the dipole operator, and revisit LEP constraints on its coefficient. Finally, we turn to heavy neutrino pair production from Higgs decays, where the former are long-lived and disintegrate into a photon and a light neutrino. We probe this process by recasting two ATLAS searches for non-pointing photons, showing the expected event distribution in terms of arrival time tγ and pointing variable |∆zγ|.

show abstract

The Present and Future Status of Heavy Neutral Leptons

Cited by 22 publications

References 521 publications

Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches

Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches

Exploring the potential of FCC-hh to search for particles from $B$ mesons

Assessment of the dimension-5 seesaw portal and impact of exotic Higgs decays on non-pointing photon searches

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