Four--Neutrino Oscillations at SNO

Abstract

We discuss the potential of the Sudbury Neutrino Observatory (SNO) to constraint the four--neutrino mixing schemes favoured by the results of all neutrino oscillations experiments. Our results show that some information on the value of ${\cos }^2({\vartheta }_{23}){\cos }^2({\vartheta }_{24})$ can be obtained by the first SNO measurement of the CC ratio, while considerable improvement on the knowledge of this mixing will be achievable after the measurement of the NC/CC ratio.

Comments: 5 pages,latex file using RevTex. 4 postscript figures. Talk presented at EURESCO Conference on Frontiers in Particle Astrophysics and Cosmology, San Feliu de Guixols, Spain