8 research outputs found
Status and perspectives of short baseline studies
The study of flavor changing neutrinos is a very active field of research. I
will discuss the status of ongoing and near term experiments investigating
neutrino properties at short distances from the source. In the next few years,
the Double Chooz, RENO and Daya Bay reactor neutrino experiments will start
looking for signatures of a non-zero value of the mixing angle
with much improved sensitivities. The MiniBooNE experiment is investigating the
LSND anomaly by looking at both the and
appearance channels. Recent results on
cross section measurements will be discussed briefly.Comment: 6 pages, 2 figures, to appear in the proceedings of the 11th
International Conference on Topics in Astroparticle and Underground Physics
(TAUP 2009), Rome, Italy, 1-5 July 200
Neutrino Mass and Grand Unification
Seesaw mechanism appears to be the simplest and most appealing way to
understand small neutrino masses observed in recent experiments. It introduces
three right handed neutrinos with heavy masses to the standard model, with at
least one mass required by data to be close to the scale of conventional grand
unified theories. This may be a hint that the new physics scale implied by
neutrino masses and grand unification of forces are one and the same. Taking
this point of view seriously, I explore different ways to resolve the puzzle of
large neutrino mixings in grand unified theories such as SO(10) and models
based on its subgroup .Comment: 17 pages, 5 figures; Invited talk at the Nobel Symposium 129 on
Neutrinos at Haga Slott, Sweden, August, 200
Learning from tau appearance
The study of numu->nutau oscillation and the explicit observation of the
nutau through the identification of the final-state tau lepton ("direct
appearance search") represent the most straightforward test of the oscillation
phenomenon. It is, nonetheless, the most challenging from the experimental
point of view. In this paper we discuss the current empirical evidence for
direct appearance of tau neutrinos at the atmospheric scale and the
perspectives for the next few years, up to the completion of the CNGS physics
programme. We investigate the relevance of this specific oscillation channel to
gain insight into neutrino physics within the standard three-family framework.
Finally, we discuss the opportunities offered by precision studies of
numu->nutau transitions in the occurrence of more exotic scenarios emerging
from additional sterile neutrinos or non-standard interactions.Comment: 26 pages, 7 figures, to appear in NJ