Characterization of the astrophysical diffuse neutrino flux using starting track events in IceCube - INSPIRE

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Characterization of the astrophysical diffuse neutrino flux using starting track events in IceCube

IceCube

Collaboration

Feb 27, 2024

27 pages

Published in:

Phys.Rev.D 110 (2024) 2, 022001

Published: Jul 2, 2024

e-Print:

2402.18026 [astro-ph.HE]

DOI:

10.1103/PhysRevD.110.022001 (publication)

Experiments:

ICECUBE

View in:

ADS Abstract Service

reference search33 citations

Citations per year

Abstract: (APS)

A measurement of the diffuse astrophysical neutrino spectrum is presented using IceCube data collected from 2011–2022 (10.3 years). We developed novel detection techniques to search for events with a contained vertex and exiting track induced by muon neutrinos undergoing a charged-current interaction. Searching for these starting track events allows us to not only more effectively reject atmospheric muons but also atmospheric neutrino backgrounds in the southern sky, opening a new window to the sub-100 TeV astrophysical neutrino sky. The event selection is constructed using a dynamic starting track veto and machine learning algorithms. We use this data to measure the astrophysical diffuse flux as a single power law flux (SPL) with a best-fit spectral index of

γ = 2.5 8_{- 0.09}^{+ 0.10}

and per-flavor normalization of

ϕ_{per - flavor}^{Astro} = 1.6 8_{- 0.22}^{+ 0.19} \times 10^{- 18} \times {GeV}^{- 1} {cm}^{- 2} s^{- 1} {sr}^{- 1}

(at 100 TeV). The sensitive energy range for this dataset is 3–550 TeV under the SPL assumption. This data was also used to measure the flux under a broken power law, however we did not find any evidence of a low energy cutoff.

Note:

27 pages, 28 figures

muon: atmosphere
neutrino: atmosphere
neutrino: background
neutrino: flux
neutrino: spectrum
energy: low
tracks
TeV
IceCube
power spectrum

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Figures(41)

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