Results 41 to 50 of about 6,824 (208)
Long-lived heavy neutral leptons with a displaced shower signature at CMS
Journal of High Energy Physics, 2023 We study the LHC discovery potential in the search for heavy neutral leptons (HNL) with a new signature: a displaced shower in the CMS muon detector, giving rise to a large cluster of hits forming a displaced shower. A new Delphes module is used to model
Giovanna Cottin +5 more
doaj +1 more source
Impact of heavy sterile neutrinos on the triple Higgs coupling [PDF]
Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017), 2018 New physics beyond the Standard Model is required to give mass to the light neutrinos. One of the simplest ideas is to introduce new heavy, gauge singlet fermions that play the role of right-handed neutrinos in a seesaw mechanism. They could have large Yukawa couplings to the Higgs boson, affecting the Higgs couplings and in particular the triple Higgs
Baglio, Julien, Weiland, Cedric
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Naturally light sterile neutrinos
, 1998 A simple model to accomodate light sterile neutrinos naturally with largemixing with the usual neutrinos has been proposed. The standard model gaugegroup is extended to include an $SU(2)_S$ gauge symmetry.
Utpal, Sarkar
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Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning
Journal of High Energy Physics, 2022 In this work, by using the machine learning methods, we study the sensitivities of heavy pseudo-Dirac neutrino N in the inverse seesaw at the high-energy hadron colliders.
Jie Feng +6 more
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Heavy sterile neutrino emission in core-collapse supernovae: constraints and signatures [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 Heavy sterile neutrinos with masses ${\mathcal O}(100)$ MeV mixing with active neutrinos can be produced in the core of a collapsing supernova (SN). In order to avoid an excessive energy loss, shortening the observed duration of the SN 1987A neutrino burst, we show that the active-sterile neutrino mixing angle should satisfy $\sin^2 θ\lesssim 5 \times ...
Mastrototaro, Leonardo +3 more
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Space–time evolution of heavy sterile neutrinos in cascade decays
Nuclear Physics B, 2014 Heavy sterile-like neutrinos may be produced resonantly from the decay of pseudoscalar mesons and may decay into several different channels in a cascade $Φ\rightarrow L^αν_h;ν_h\rightarrow \{X\}$. In general these are rare events with displaced vertices. We provide a non-perturbative and manifestly unitary framework that describes the cascade decay and
Gninenko, S. N., Gorbunov, D. S.
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Probing right-handed neutrinos dipole operators
Journal of High Energy Physics, 2023 We consider the minimal see-saw extension of the Standard Model with two right-handed singlet fermions N 1,2 with mass at the GeV scale, augmented by an effective dipole operator between the sterile states.
Daniele Barducci +3 more
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Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances [PDF]
International Journal of Modern Physics E, 2021 The production of heavy-mass elements due to the rapid neutron-capture mechanism ([Formula: see text]-process) is associated with astrophysical scenarios, such as supernovae and neutron-star mergers. In the [Formula: see text]-process the capture of neutrons is followed by [Formula: see text]-decays until nuclear stability is reached. A key element in
M. M. Saez +3 more
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Sterile neutrinos in cosmology [PDF]
, 2017 Sterile neutrinos are natural extensions to the standard model of particle physics in neutrino mass generation mechanisms. If they are relatively light, less than approximately 10 keV, they can alter cosmology significantly, from the early Universe to ...
Abazajian, KN +2 more
core +1 more source
Search for the dipole portal of heavy neutral leptons at future colliders
Journal of High Energy Physics, 2023 In this paper, we study the potential of future colliders to explore the parameter space of heavy neutral leptons (HNLs) through the dipole portal. We consider hadron colliders such as the LHC in the high luminosity phase and FCC-hh, and lepton colliders,
Maksym Ovchynnikov, Jing-Yu Zhu
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