http://arxiv.org/abs/1412.8264
We fit the energy distribution of the IceCube starting events by a model which involves four parameters in the neutrino spectrum, namely three normalizations $n_e,n_\mu,n_\tau$ and a common power-law index $\gamma$, with a fixed background simulated by IceCube. The fit by the democratic composition $n_e = n_\mu = n_\tau$ is as marginally acceptable ($p \simeq 0.14$) as the independent $n_\alpha$ case ($p \simeq 0.12$), with the best fit index $\gamma \simeq 2.7$. While for the fixed index $\gamma = 2.0$, both fits by the democratic and the generic composition are unacceptably poor. In the both cases of $\gamma = 2.0$ and $2.7$, the best configuration is $n_e:n_\mu:n_\tau \simeq 1:0.1:0$, which is unlikely under the standard physics.
A. Watanabe
Tue, 30 Dec 14
80/83
Comments: 13 pages, 9 figures
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