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Baryogenesis, Dark Matter and Neutrino Oscillations from Right-Handed Neutrinos

Publications associées (194)

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How to find a dark matter sterile neutrino?

Alexey Boyarsky, Oleg Ruchayskiy, Igor Tkachev

We propose a strategy for how to look for dark matter particles possessing a radiative decay channel and derive constraints on their parameters from observations of x rays from our own Galaxy and its dwarf satellites. When applied to sterile neutrinos in t ...

2006

Observation of b→dγ and determination of |Vtd/Vts|

Stewart Cole, Tagir Aushev, Vladislav Balagura, Sun Hee Kim

We report the observation of the flavor-changing neutral current process b→dγ using a sample of 386×106 B meson pairs accumulated by the Belle detector at the KEKB e+e- collider. We measure branching fractions for the exclusive modes B-→ρ-γ, B̄0→ρ0γ, and B ...

2006

The nuMSM, dark matter and baryon asymmetry of the universe

We show that the extension of the standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM) can explain simultaneously dark matter and baryon asymmetry of the universe and be consistent with the experiments on ...

2005

The nuMSM, dark matter and neutrino masses

Steve Blanchet

We investigate an extension of the Minimal Standard Model by right-handed neutrinos (the νMSM) to incorporate neutrino masses consistent with oscillation experiments. Within this theory, the only candidates for dark matter particles are sterile right-hande ...

2005

Astrophysical bounds on supersymmetric dark-matter Q- balls

Stable baryonic Q-balls, which appear in supersymmetric extensions of the Standard Model, could form at the end of cosmological inflation from fragmentation of the Affleck-Dine condensate. We reconsider astrophysical constraints on such Q-balls as dark mat ...

2005

Supersymmetric dark matter Q-balls and their interactions in matter

Supersymmetric extensions of the Standard Model contain nontopological solitons, Q-balls, which can be stable and can be a form of cosmological dark matter. Understanding the interaction of SUSY Q-balls with matter fermions is important for both astrophysi ...

2005

Superheavy dark matter and supersymmetry

We discuss supersymmetric Q-balls as possible candidates for dark matter particles, their interaction in matter and astrophysical constraints on their existence. © 2005 Elsevier B.V. All rights reserved. ...

2005

Crack-free fully epitaxial nitride microcavity using highly reflective AllnN/GaN Bragg mirrors

Nicolas Grandjean, Jean-François Carlin, Marc Ilegems, Raphaël Butté, Eric Feltin, Julien Dorsaz

We report the growth over 2 in. sapphire substrates of crack-free fully epitaxial nitride-based microcavities using two highly reflective lattice-matched AlInN/GaN distributed Bragg reflectors (DBRs). The optical cavity is formed by an empty 3lambda/2 GaN ...

2005

Geant4—a simulation toolkit

Sebastiana Gianì

Geant4 is a toolkit for simulating the passage of particles through matter. It includes a complete range of functionality including tracking, geometry, physics models and hits. The physics processes offered cover a comprehensive range, including electromag ...

2003

Search for excited leptons at LEP

Qian Wang, Aurelio Bay, Horst Vogel, Eduardo Sanchez, Zhirui Xu, Werner Lustermann, Liang Sun, Jian Zhao, Ji Hyun Kim, Zheng Wang, Matthias Weber, Xiao Wang

A search for charged and neutral excited leptons is performed in 217 pb(-1) of e(+)e(-) collision data collected with the L3 detector at LEP at centre-of-mass energies from 202 up to 209 GeV The pair- and single-production mechanisms of excited electrons, ...

Elsevier2003