Characterization of the Astrophysical Diffuse Neutrino Flux using Starting Track Events in IceCube
Creators: name: Abbasi, R.
name: Ackermann, M.
name: Adams, J.
name: Agarwalla, S. K.
name: Aguilar, J. A.
name: Ahlers, M.
name: Alameddine, J. M.
name: Amin, N. M.
name: Andeen, K.
name: Anton, G.
name: Argüelles, C.
name: Ashida, Y.
name: Athanasiadou, S.
name: Ausborm, L.
name: Axani, S. N.
name: Bai, X.
name: V., A. Balagopal
name: Baricevic, M.
name: Barwick, S. W.
name: Bash, S.
name: Basu, V.
name: Bay, R.
name: Beatty, J. J.
name: Tjus, J. Becker
name: Beise, J.
name: Bellenghi, C.
name: Benning, C.
name: BenZvi, S.
name: Berley, D.
name: Bernardini, E.
name: Besson, D. Z.
name: Blaufuss, E.
name: Blot, S.
name: Bontempo, F.
name: Book, J. Y.
name: Meneguolo, C. Boscolo
name: Böser, S.
name: Botner, O.
name: Böttcher, J.
name: Braun, J.
name: Brinson, B.
name: Brostean-Kaiser, J.
name: Brusa, L.
name: Burley, R. T.
name: Busse, R. S.
name: Butterfield, D.
name: Campana, M. A.
name: Caracas, I.
name: Carloni, K.
name: Carpio, J.
name: Chattopadhyay, S.
name: Chau, N.
name: Chen, Z.
name: Chirkin, D.
name: Choi, S.
name: Clark, B. A.
name: Coleman, A.
name: Collin, G. H.
name: Connolly, A.
name: Conrad, J. M.
name: Coppin, P.
name: Corley, R.
name: Correa, P.
name: Cowen, D. F.
name: Dave, P.
name: De Clercq, C.
name: DeLaunay, J. J.
name: Delgado, D.
name: Deng, S.
name: Deoskar, K.
name: Desai, A.
name: Desiati, P.
name: de Vries, K. D.
name: de Wasseige, G.
name: DeYoung, T.
name: Diaz, A.
name: Díaz-Vélez, J. C.
name: Dittmer, M.
name: Domi, A.
name: Draper, L.
name: Dujmovic, H.
name: Dutta, K.
name: DuVernois, M. A.
name: Ehrhardt, T.
name: Eidenschink, L.
name: Eimer, A.
name: Eller, P.
name: Ellinger, E.
name: Mentawi, S. El
name: Elsässer, D.
name: Engel, R.
name: Erpenbeck, H.
name: Evans, J.
name: Evenson, P. A.
name: Fan, K. L.
name: Fang, K.
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name: Fazely, A. R.
name: Fedynitch, A.
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name: Günther, C.
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name: Hamdaoui, H.
name: Minh, M. Ha
name: Handt, M.
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name: Karle, A.
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name: Katz, U.
name: Kauer, M.
name: Kelley, J. L.
name: Khanal, M.
name: Zathul, A. Khatee
name: Kheirandish, A.
name: Kiryluk, J.
name: Klein, S. R.
name: Kochocki, A.
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name: Kopper, C.
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name: Latseva, S.
name: Lauber, F.
name: Lazar, J. P.
name: Lee, J. W.
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name: Liao, J.
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name: Liubarska, M.
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Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $γ= 2.58 ^{+0.10}_{-0.09}$ and per-flavor normalization of $ϕ^{\mathrm{Astro}}_{\mathrm{per-flavor}} = 1.68 ^{+0.19}_{-0.22} \times 10^{-18} \times \mathrm{GeV}^{-1} \mathrm{cm}^{-2} \mathrm{s}^{-1} \mathrm{sr}^{-1}$ (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.
description: 27 pages, 28 figures