| Abstract: | As atmospheric neutrinos propagate through the Earth, vacuum-like
oscillations are modified by Standard-Model neutral- and charged-current
interactions with electrons. Theories beyond the Standard Model introduce
heavy, TeV-scale bosons that can produce nonstandard neutrino interactions.
These additional interactions may modify the Standard Model matter effect
producing a measurable deviation from the prediction for atmospheric neutrino
oscillations. The result described in this paper constrains nonstandard
interaction parameters, building upon a previous analysis of atmospheric
muon-neutrino disappearance with three years of IceCube-DeepCore data. The best
fit for the muon to tau flavor changing term is $epsilon_{mu au}=-0.0005$,
with a 90\% C.L. allowed range of $-0.0067 <epsilon_{mu au}< 0.0081$. This
result is more restrictive than recent limits from other experiments for
$epsilon_{mu au}$. Furthermore, our result is complementary to a recent
constraint on $epsilon_{mu au}$ using another publicly available IceCube
high-energy event selection. Together, they constitute the world’s best limits
on nonstandard interactions in the $mu- au$ sector. |
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