出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present an analysis of the global neutrino oscillation data including the
LSND result in terms of four-neutrino mass schemes and a CPT violating three-neutrino
framework. We nd that the strong preference of oscillations into active neutrinos implied
by recent solar+KamLAND as well as atmospheric neutrino data allows to rule out
(2+2) mass schemes at 5.8, whereas (3+1) schemes are disfavoured at the 3.2 level by
short-baseline experiments. The CPT violating scenario is disfavoured at 3.4 by Kam-
LAND and atmospheric anti-neutrino data. We conclude that currently no convincing
explanation for the LSND signal exists, and it remains a puzzle how to reconcile it with
the other evidences for neutrino oscillations.
