1,753 research outputs found
A novel method to extract dark matter parameters from neutrino telescope data
Recently it has been shown that when the Dark Matter (DM) particles captured
in the Sun directly annihilate into neutrino pairs, the oscillatory terms in
the oscillation probability do not average to zero and can lead to a seasonal
variation as the distance between the Sun and Earth changes in time. In this
paper, we explore this feature as a novel method to extract information on the
properties of dark matter. We show that by studying the variation of the flux
over a few months, it would in principle be possible to derive the DM mass as
well as new information on the flavor structure of the DM annihilation modes.
In addition to analytic analysis, we present the results of our numerical
calculations that take into account scattering and regeneration of neutrinos
traversing the Sun.Comment: 18 pages, 2 figures, 3 tables; comments and 1 figure added,
acknowledgment added, published versio
On the robustness of IceCube's bound on sterile neutrinos in the presence of non-standard interactions
The mixing parameters of sterile neutrino(s) preferred by the MiniBooNE and
LNSD experiments are in strong tension with the exclusion limit from the
IceCube experiment. Recently it has been claimed that by considering the
non-standard neutrino interactions (NSI) in addition to the sterile neutrino,
the IceCube's limit can be relaxed and the tension can be reconciled; a baroque
scenario as it has been called. We will show that this claim is just an
artifact originating from the energy cuts of the chosen datasets. Contrary to
the claim, by turning on the NSI and fixing the NSI parameters to the proposed
values, not only the IceCube's limit on sterile neutrino cannot be alleviated,
but in fact the tension will be aggravated. The reconciliation, more
appropriately, can be called surreal.Comment: 15 pages, 4 figures; v2: a few clarifications have been adde
Implications of the Pseudo-Dirac Scenario for Ultra High Energy Neutrinos from GRBs
The source of Ultra High Energy Cosmic Rays (UHECR) is still an unresolved
mystery. Up until recently, sources of Gamma Ray Bursts (GRBs) had been
considered as a suitable source for UHECR. Within the fireball model, the UHECR
produced at GRBs should be accompanied with a neutrino flux detectable at the
neutrino telescope such as IceCube. Recently, IceCube has set an upper bound on
the neutrino flux accompanied by GRBs about 3.7 times below the prediction. We
investigate whether this deficit can be explained by the oscillation of the
active neutrinos to sterile neutrinos en route from the source to the detectors
within the pseudo-Dirac scenario. We then discuss the implication of this
scenario for diffuse supernova relic neutrinos.Comment: 14 pages, 5 figures; v2: figures added, discussion improved, matches
the version published in JCA
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