A5024019725- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Planetary Science and Exploration
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
Durham University
2018-2022
A bstract We revisit the possibility of producing observed baryon asymmetry Universe via thermal leptogenesis, where CP violation comes exclusively from low-energy phases neutrino mixing matrix. demonstrate viability flavoured leptogenesis across seven orders magnitude (10 6 < T (GeV) 10 13 ), using modern numerical machinery, lower bound can be reached only if flavour effects are taken into account and its value depends on allowed degree cancellation between tree-level radiative...
Leptogenesis can successfully explain the matter-antimatter asymmetry via out-of-equilibrium decays of heavy Majorana neutrinos in early Universe. In this article, we focus on non-resonant thermal leptogenesis and possibility lowering its scale. order to do so, calculate lepton produced from one two using three-flavoured density matrix equations an exhaustive exploration model parameter space. We find regions space where is viable at intermediate scales, $T\sim 10^{6}$ GeV. However,...
We discuss the most general necessary and sufficient condition for three massless light neutrinos in variants of type I seesaw mechanism which we introduce an arbitrary number fermionic gauge singlets. find that having is equivalent to enforcing conservation lepton number. As a consequence, any symmetry leads will contain as unbroken subgroup conserved This be important searches heavy sterile since neutrino masses proportional small violating parameters also suppress signatures.
We consider sub-TeV scale flavoured resonant leptogenesis within the minimal type-I seesaw scenario with two right-handed singlet neutrinos N1,2 forming a pseudo-Dirac pair, concentrating on case of masses pair having values M1,2≲100 GeV. The when CP violating asymmetries in individual lepton charges Ll, l=e,μ,τ, and total charge L Universe are generated 1↔2 decay processes is investigated. show that successful possible for M1,2 lying interval M1,2=(0.3−100) Our results also, particular,...
A bstract We examine the compatibility between Neutrino Option, in which electroweak scale is generated by PeV mass type I seesaw Majorana neutrinos, and leptogenesis. find Option consistent with resonant Working within minimal scenario two heavy neutrinos N 1, 2 , form a pseudo-Dirac pair, we explore viable parameter space. that successful leptogenesis are compatible cases of neutrino spectrum normal (inverted) ordering for 1.2 × 10 6 < M (GeV) 8.8 (2.4 7.4 ), = ( 1 + )/2 masses ....
A bstract Using the density matrix equations (DME) for high scale leptogenesis based on type I seesaw mechanism, in which CP violation (CPV) is provided by low-energy Dirac or/and Majorana phases of neutrino mixing (PMNS) matrix, we investigate 1-to-2 and 2-to-3 flavour regime transitions, where 1, 2 3 regimes generation baryon asymmetry Universe η B are described Boltzmann equations. Concentrating transition determine general conditions under goes through zero changes sign transition....