Results 71 to 80 of about 9,015 (168)
Neutrinos in cosmology, with some significant digressions [PDF]
, 2002 Neutrinos play prominent roles in both particle physics and cosmology. In this talk, I will cover two broad topics. The first will be possible origins for neutrino masses and mixings and the implications of this physics for cosmology.
Volkas, Raymond R.
core +3 more sources
Tree-level UV completions for N R SMEFT d = 6 and d = 7 operators
Journal of High Energy Physics, 2023 We study ultra-violet completions for operators in standard model effective field theory extended with right-handed neutrinos (N R SMEFT). Using a diagrammatic method, we generate systematically lists of possible tree-level completions involving scalars,
Rebeca Beltrán +2 more
doaj +1 more source
Heavy Neutral Leptons at FASER
, 2018 We study the prospects for discovering heavy neutral leptons at ForwArd Search ExpeRiment (FASER), the newly proposed detector at the LHC. Previous studies showed that a relatively small detector with ~10 m length and ~1 m cross sectional area can probe ...
Kling, Felix, Trojanowski, Sebastian
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Testing Heavy Neutral Leptons in Cosmic Ray Beam Dump experiments
Journal of High Energy Physics, 2023 In this work, we discuss the possibility to test Heavy Neutral Leptons (HNLs) using “Cosmic Ray Beam Dump” experiments. In analogy with terrestrial beam dump experiments, where a beam first hits a target and is then absorbed by a shield, we consider high-
Oliver Fischer +2 more
doaj +1 more source
keV sterile neutrino dark matter in gauge extensions of the standard model
, 2010 It is known that a keV scale sterile neutrino is a good warm dark matter candidate. We study how this possibility could be realized in the context of gauge extensions of the standard model. The na\"ive expectation leads to large thermal overproduction of
E. W. Kolb +4 more
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Radiative Majorana neutrino masses in a parity solution to the strong CP problem
Journal of High Energy PhysicsThe strong CP problem is solved in Parity symmetric theories, with the electroweak gauge group containing SU(2) L × SU(2) R broken by the minimal set of Higgs fields. Neutrino masses may be explained by adding the same number of gauge singlet fermions as
Lawrence J. Hall +2 more
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A Naturally Light Sterile neutrino in an Asymmetric Dark Matter Model
, 2013 A recently proposed asymmetric mirror dark matter model where the mirror sector is connected with the visible one by a right handed neutrino portal, is shown to lead naturally to a 3+1 active-sterile neutrino spectrum, if the portal consists only of two ...
Ji, Xiangdong +2 more
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Constraining the SMEFT extended with sterile neutrinos at FCC-ee
Journal of High Energy PhysicsWe investigate how extensions of the Standard Model (SM) involving heavy neutral leptons (HNLs) can be probed at FCC-ee, the proposed high-energy circular e + e − collider.
Patrick D. Bolton +4 more
doaj +1 more source
Leptogenesis from oscillations and dark matter
, 2019 An extension of the Standard Model with Majorana singlet fermions in the 1-100 GeV range can give rise to a baryon asymmetry at freeze-in via the CP-violating oscillations of these neutrinos: this is the well known ARS mechanism.
Caputo, Andrea +2 more
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Long-lived HNLs via ALP portal at the LHC
Journal of High Energy PhysicsHeavy neutral leptons (HNLs) and axion-like particles (ALPs) are both considered well-motivated candidates for beyond the standard model (BSM) physics. If ALPs with sizable couplings to gluons exist, they will be abundantly produced at the LHC. Therefore,
Rebeca Beltrán +3 more
doaj +1 more source