SNO, SuperKamiokande data, antineutrinos and sterile neutrinos

Details SNO, SuperKamiokande data, antineutrinos and sterile neutrinos SNO, SuperKamiokande data, antineutrinos and sterile neutrinos

2004-06-21

arxiv.org/abs/hep-ph/0406227v2

JHEP0412:040,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 eps figures, final version to appear in JHEP

Scientific paper

10.1088/1126-6708/2004/12/040

Allowing for antineutrinos ($\bar\nu_x$) and sterile neutrinos ($\nu_s$) to accompany LMA oscillations, we derive in a model independent way, upper bounds on their components in the solar flux, using the recent data from SNO and SuperKamiokande. Along with the general case (LMA + $\bar\nu_x$ + $\nu_s$) we consider the special cases where only $\bar\nu_x$ or $\nu_s$ are present. We obtain an upper bound on $\bar\nu_x$ which is independent of the $\nu_s$ component. In the no sterile case we obtain upper and lower bounds on $f_B$, the SSM normalization factor. We also investigate in the general case the common parameter range for $f_B$ and the $\bar\nu_x$, $\nu_s$ components and find that the upper bound on $\nu_s$ is hardly sensitive to the $\bar\nu_x$ component. In the absence of $\bar\nu_x$ we recover the $\nu_s$ upper bound existing in the literature. We finally present a simple $\chi^2$ analysis of all four cases considered.

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