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The Neutrino mass matrix after Kamland and SNO salt enhanced results
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Preprint typeset in JHEP style - HYPER VERSION CERN-TH-2003-150; IFUM-746/FT
FT-UM-TH-03-12; IFTM-03-10
ULB-TH/03-31
The Neutrino mass matrix after Kamland
and SNO salt enhanced results
P. Aliania, V. Antonellib,c, M. Picariellob,c, E. Torrente-Lujand,e,f
a Service de Physique The?orique, Universite? Libre Bruxelles, Bruxelles, Belgium
b Dip. di Fisica, Universita? degli Studi di Milano, Milano, Italy
c I.N.F.N., Sezione di Milano, Milano, Italy
d Dept. de Fisica, Universidad de Murcia, Murcia, Spain
e Instituto de Fisica Teorica, Universidad de Murcia, Murcia, Spain
f CERN-TH Division, CH-1211 Geneve 23, Switzerland
paola.aliani@ulb.ac.be, vito.antonelli@mi.infn.it,
marco.picariello@mi.infn.it, torrente@cern.ch
Abstract: An updated analysis of all available neutrino oscillation evidence in
Solar experiments including the latest SNOES,CC and NC data (254d live time,
NaCL enhanced efficiency) is presented. We obtain, for the fraction of active os-
cillating neutrinos: sin2 α = (ΦNC ? ΦCC)/(ΦSSM ? ΦCC) = 0.940
+0.065
?0.060 nearly 20σ
from the pure sterile oscillation case. The fraction of oscillating sterile neutrinos
cos2 α ～ 0.12 (1σ CL). At face value, these results might slightly favour the exis-
tence of a small sterile oscillating sector. In the framework of two active neutrino
oscillations we determine individual neutrino mixing parameters and their errors and
we obtain ?m2 = 7.01 ± 0.08 × 10?5eV2, tan2 θ = 0.42+0.12?0.07. The main difference
with previous analyses is a better resolution in parameter space. In particular the
secondary region at larger mass differences (LMAII) is now excluded at 95% CL.
The combined analysis of solar and Kamland data concludes that maximal mixing is
not favoured at ～ 4? 5σ. This is not supported by the antineutrino reactor results
alone. We also estimate the individual elements of the two neutrino mass matrix,
writing M2 = m2I +M20 , we obtain (1σ errors):
M20 =
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