Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events) - INSPIRE

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Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)

Ranjan Laha
(
- Ohio State U., CCAPP and
- Ohio State U.
)
,
John F. Beacom
(
)
,
Basudeb Dasgupta
(
- ICTP, Trieste
)
,
Shunsaku Horiuchi
(
- UC, Irvine
)
,
Kohta Murase
(
- Princeton, Inst. Advanced Study
)

Jun 10, 2013

15 pages

Published in:

Phys.Rev.D 88 (2013) 043009

Published: Aug 21, 2013

e-Print:

1306.2309 [astro-ph.HE]

DOI:

10.1103/PhysRevD.88.043009

View in:

ADS Abstract Service

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Abstract: (APS)

The IceCube neutrino observatory has detected two cascade events with energies near 1 PeV [A. Ishihara Proceedings of Neutrino 2012 Conference, http://neu2012.kek.jp/index.html; M. Aartsen et al. (IceCube Collaboration) Phys. Rev. Lett. 111, 021103 (2013)]. Without invoking new physics, we analyze the source of these neutrinos. We show that atmospheric conventional neutrinos and cosmogenic neutrinos (those produced in the propagation of ultra-high-energy cosmic rays) are strongly disfavored. For atmospheric prompt neutrinos or a diffuse background of neutrinos produced in astrophysical objects, the situation is less clear. We show that there is tension with observed data, but that the details depend on the least-known aspects of the IceCube analysis. Very likely, prompt neutrinos are disfavored and astrophysical neutrinos are plausible. We demonstrate that the fastest way to reveal the origin of the observed PeV neutrinos is to search for neutrino cascades in the range below 1 PeV, for which dedicated analyses with high sensitivity have yet to appear, and where many more events could be found.

Note:

v3: 17 pages, 5 figures. Factor 2 in effective area fixed. Conclusions unchanged. Accepted in Phys. Rev. D

95.85.Ry
95.55.Vj
14.60.Lm
neutrino: background
cosmic radiation: UHE
IceCube
cascade
neutrino: atmosphere
bibliography
neutrino: energy: high

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Figures(8)

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)
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)
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