Heavy Neutral Leptons from kaon decays in the SHiP experiment

Autor: I. V. Krasnov, Sergey Suvorov, Dmitry Gorbunov, Yu. G. Kudenko
Přispěvatelé: Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Rok vydání: 2020
Předmět:
Nuclear and High Energy Physics
Sterile neutrino
Particle physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
lepton
Hadron
Nuclear Theory
FOS: Physical sciences
showers: hadronic
01 natural sciences
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
High Energy Physics - Phenomenology (hep-ph)
Big Bang nucleosynthesis
Tau neutrino
cosmological model: parameter space
0103 physical sciences
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
mixing
010306 general physics
Nuclear Experiment
Physics
Muon
010308 nuclear & particles physics
High Energy Physics::Phenomenology
nucleosynthesis: primordial
neutrino: sterile
CERN SPS
K: decay
lcsh:QC1-999
seesaw model: minimal
High Energy Physics - Phenomenology
kinematics
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
beam dump
High Energy Physics::Experiment
Neutrino
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Phenomenology (particle physics)
lcsh:Physics
light nucleus
Lepton
Astrophysics - Cosmology and Nongalactic Astrophysics
Zdroj: Phys.Lett.B
Phys.Lett.B, 2020, 810, pp.135817. ⟨10.1016/j.physletb.2020.135817⟩
Physics Letters B
Physics Letters B, Elsevier, 2020, 810, pp.135817. ⟨10.1016/j.physletb.2020.135817⟩
Physics Letters
Physics Letters B, Vol 810, Iss, Pp 135817-(2020)
ISSN: 0370-2693
DOI: 10.48550/arxiv.2004.07974
Popis: We calculate the signal rate of hypothetical heavy neutral leptons (HNL or sterile neutrinos) from kaon decays expected in the framework of the SHiP experiment. The kaons are produced in the hadronic shower initiated in the beam-dump mode by 400 GeV protons from CERN SPS. For a sufficiently light HNL (when the decays are kinematically allowed) we find kaon decays to be a noticeably richer source of HNL as compared to $D$-meson decays adopted in previous studies of the HNL phenomenology at SHiP. In particular, SHiP is capable of fully exploring the central part of the kinematically allowed region of the HNL mass and mixing with electron and muon neutrinos down to the lower cosmological bound. The latter is associated with HNL decays in the early Universe to energetic products rescattering off and thus destroying light nuclei produced at the primordial nucleosynthesis. A consistency of the HNL model with smaller mixing would require either a hierarchy -- much larger mixing of all the HNL with tau neutrino -- or non-standard cosmology and new ingredients in the HNL sector, closing the room for the minimal non-seesaw type I model with sterile neutrinos lighter than kaons.
Comment: 19 pages, 16 figures; replaced with journal version
Databáze: OpenAIRE
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