6533b850fe1ef96bd12a85eb
RESEARCH PRODUCT
An improved cosmological bound on the tau-neutrino mass
José W. F. ValleSergio PastorA.d. Dolgovsubject
PhysicsNuclear and High Energy PhysicsParticle physicsPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)High Energy Physics::PhenomenologyFOS: Physical sciencesFísicaAstrophysicsUpper and lower boundsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)NucleosynthesisTau neutrinoHigh Energy Physics::ExperimentNeutrinoBar (unit)description
We consider the influence of non-equilibrium electronic neutrinos (and anti-neutrinos) on the neutron-to-proton ratio. These neutrinos would come from massive $\nu_\tau$ annihilations $\bar \nu_\tau \nu_\tau \rightarrow \bar \nu_e \nu_e$. For sufficiently large $\nu_\tau$ masses this new effect would strongly enhance the (n/p)-ratio, leading to a very stringent bound on the $\nu_\tau$ mass, even adopting a rather weak upper bound on the effective number on neutrino species during nucleosynthesis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-02-06 |