ar X iv : h ep - p h / 99 06 38 1 v 2 6 S ep 1 99 9 Nature of neutrinos in the light of present and future experiments

ar X iv : h ep - p h / 99 06 38 1 v 1 1 6 Ju n 19 99 Nature of neutrinos in the light of present and future experiments

Two general models with hierarchical and almost degenerate neutrino masses, which are able to explain the solar and atmospheric anomalies are investigated. We show how neutrinoless double beta decay experiments discern Dirac and Majorana natures of neutrinos. The strongest result is, that almost degenerate neutrinos with masses above 0.22 eV combined with the SMA MSW must be Dirac particles. In...

ar X iv : h ep - t h / 99 06 02 9 v 1 3 J un 1 99 9

ar X iv : h ep - p h / 96 05 34 7 v 1 1 7 M ay 1 99 6 Neutrinos and Electromagnetic Gauge Invariance

It is discussed a recently proposed connection among U(1) em electromagnetic gauge invariance and the nature of the neutrino mass terms in the framework

ar X iv : h ep - p h / 99 10 51 0 v 2 2 8 O ct 1 99 9 ULB – TH 99 / 19 October 1999 Neutrino gravitational lensing

We study the lensing of neutrinos by astrophysical objects. At the difference of photons, neutrinos can cross a stellar core; as a result the lens quality improves. While Uranians alone would benefit from this effect in the Sun, similar effects could be considered for binary systems. Chercheur I. I. S. N. Directeur de recherches du F. N. R. S.

ar X iv : h ep - p h / 99 09 22 3 v 1 2 S ep 1 99 9 IC - HEP / 99 - 03 Future ep Physics : The Outlook for HERA

The luminosity of the electron-proton collider, HERA, will be increased by a factor of five during the long shutdown in the year 2000. At the same time longitudinal lepton beam polarisation will be provided for the collider experiments H1 and ZEUS. These far reaching upgrades to the machine will be matched by upgrades to the detectors. The result will be a unique facility for the study of the s...