A Redetermination of the neutrino mass squared difference in tri - maximal mixing with terrestrial matter effects - INSPIRE

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A Redetermination of the neutrino mass squared difference in tri - maximal mixing with terrestrial matter effects

P.F. Harrison
(
- Queen Mary, U. of London
)
,
D.H. Perkins
(
- Oxford U.
)
,
W.G. Scott
(
- Rutherford
)

Mar, 1999

25 pages

Published in:

Phys.Lett.B 458 (1999) 79-92

e-Print:

hep-ph/9904297 [hep-ph]

DOI:

10.1016/S0370-2693(99)00438-4

Report number:

RAL-TR-1999-026

View in:

ADS Abstract Service

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Abstract:

We re-fit for the neutrino mass-squared difference

\Delta m^2

in the threefold maximal (ie. tri-maximal) mixing scenario using recent CHOOZ and SUPER-K data, taking account of matter effects in the Earth. While matter effects have little influence on reactor experiments and proposed long-baseline accelerator experiments with L \simlt 1000 km, they are highly significant for atmospheric experiments, suppressing naturally

\nu_e

mixing and enhancing

\nu_{\mu} - \nu_{\tau}

mixing, so as to effectively remove the experimental distinction between threefold maximal and twofold maximal

\nu_{\mu}-\nu_{\tau}

mixing. Threefold maximal mixing is fully consistent with the CHOOZ and SUPER-K data and the best-fit value for the neutrino mass-squared difference is

\Delta m^2 = (0.98 \pm^{0.30}_{0.23}) \times 10^{-3} eV^2

.

Note:

17 Pages LaTex, plus 8 Figures as postscript files Report-no: RAL-TR-1999-026

neutrino: mass difference
neutrino: mixing angle
neutrino: cosmic radiation
muon: angular distribution
electron: angular distribution
neutrino: nuclear reaction
neutrino: oscillation
matter: effect
neutrino: beam
statistical analysis

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