Search for neutrino-induced particle showers with IceCube-40

M.G. Aartsen; R. Abbasi; M. Ackermann; J. Admas; J.A. Aguilar; M. Ahlers; D. Altmann; C. Arguelles; T.C. Arlen; J. Auffenberg; X. Bai; M. Baker; David Jason Koskinen; Subir Sarkar; Michael James Larson

doi:10.1103/PhysRevD.89.102001

Search for neutrino-induced particle showers with IceCube-40

M.G. Aartsen, R. Abbasi, M. Ackermann, J. Admas, J.A. Aguilar, M. Ahlers, D. Altmann, C. Arguelles, T.C. Arlen, J. Auffenberg, X. Bai, M. Baker, David Jason Koskinen, Subir Sarkar, Michael James Larson

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Abstract

We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three complementary searches were performed, each optimized for different energy regimes. The analysis with the lowest energy threshold (2 TeV) targeted atmospheric neutrinos. A total of 67 events were found, consistent with the expectation of 41 atmospheric muons and 30 atmospheric neutrino events. The two other analyses targeted a harder, astrophysical neutrino flux. The analysis with an intermediate threshold of 25 TeV leads to the observation of 14 cascadelike events, again consistent with the prediction of 3.0 atmospheric neutrino and 7.7 atmospheric muon events. We hence set an upper limit of E2Φlim≤7.46×10-8GeVsr-1s-1cm-2 (90% C.L.) on the diffuse flux from astrophysical neutrinos of all neutrino flavors, applicable to the energy range 25 TeV to 5 PeV, assuming an Eν-2 spectrum and a neutrino flavor ratio of 1 at the Earth. The third analysis utilized a larger and optimized sample of atmospheric muon background simulation, leading to a higher energy threshold of 100 TeV. Three events were found over a background prediction of 0.04 atmospheric muon events and 0.21 events from the flux of conventional and prompt atmospheric neutrinos. Including systematic errors this corresponds to a 2.7σ excess with respect to the background-only hypothesis. Our observation of neutrino event candidates above 100 TeV complements IceCube's recently observed evidence for high-energy astrophysical neutrinos.

Originalsprog	Engelsk
Artikelnummer	102001
Tidsskrift	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Vol/bind	89
Antal sider	20
ISSN	1550-7998
DOI	https://doi.org/10.1103/PhysRevD.89.102001
Status	Udgivet - 1 maj 2014

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Aartsen, M. G., Abbasi, R., Ackermann, M., Admas, J., Aguilar, J. A., Ahlers, M., Altmann, D., Arguelles, C., Arlen, T. C., Auffenberg, J., Bai, X., Baker, M., Koskinen, D. J., Sarkar, S., & Larson, M. J. (2014). Search for neutrino-induced particle showers with IceCube-40. Physical Review D (Particles, Fields, Gravitation and Cosmology), 89, [102001]. https://doi.org/10.1103/PhysRevD.89.102001

Aartsen, MG, Abbasi, R, Ackermann, M, Admas, J, Aguilar, JA, Ahlers, M, Altmann, D, Arguelles, C, Arlen, TC, Auffenberg, J, Bai, X, Baker, M, Koskinen, DJ, Sarkar, S & Larson, MJ 2014, 'Search for neutrino-induced particle showers with IceCube-40', Physical Review D (Particles, Fields, Gravitation and Cosmology), bind 89, 102001. https://doi.org/10.1103/PhysRevD.89.102001

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abstract = "We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three complementary searches were performed, each optimized for different energy regimes. The analysis with the lowest energy threshold (2 TeV) targeted atmospheric neutrinos. A total of 67 events were found, consistent with the expectation of 41 atmospheric muons and 30 atmospheric neutrino events. The two other analyses targeted a harder, astrophysical neutrino flux. The analysis with an intermediate threshold of 25 TeV leads to the observation of 14 cascadelike events, again consistent with the prediction of 3.0 atmospheric neutrino and 7.7 atmospheric muon events. We hence set an upper limit of E2Φlim≤7.46×10-8GeVsr-1s-1cm-2 (90% C.L.) on the diffuse flux from astrophysical neutrinos of all neutrino flavors, applicable to the energy range 25 TeV to 5 PeV, assuming an Eν-2 spectrum and a neutrino flavor ratio of 1 at the Earth. The third analysis utilized a larger and optimized sample of atmospheric muon background simulation, leading to a higher energy threshold of 100 TeV. Three events were found over a background prediction of 0.04 atmospheric muon events and 0.21 events from the flux of conventional and prompt atmospheric neutrinos. Including systematic errors this corresponds to a 2.7σ excess with respect to the background-only hypothesis. Our observation of neutrino event candidates above 100 TeV complements IceCube's recently observed evidence for high-energy astrophysical neutrinos.",

author = "M.G. Aartsen and R. Abbasi and M. Ackermann and J. Admas and J.A. Aguilar and M. Ahlers and D. Altmann and C. Arguelles and T.C. Arlen and J. Auffenberg and X. Bai and M. Baker and Koskinen, {David Jason} and Subir Sarkar and Larson, {Michael James}",

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AU - Aartsen, M.G.

AU - Abbasi, R.

AU - Ackermann, M.

AU - Admas, J.

AU - Aguilar, J.A.

AU - Ahlers, M.

AU - Altmann, D.

AU - Arguelles, C.

AU - Arlen, T.C.

AU - Auffenberg, J.

AU - Bai, X.

AU - Baker, M.

AU - Koskinen, David Jason

AU - Sarkar, Subir

AU - Larson, Michael James

PY - 2014/5/1

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N2 - We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three complementary searches were performed, each optimized for different energy regimes. The analysis with the lowest energy threshold (2 TeV) targeted atmospheric neutrinos. A total of 67 events were found, consistent with the expectation of 41 atmospheric muons and 30 atmospheric neutrino events. The two other analyses targeted a harder, astrophysical neutrino flux. The analysis with an intermediate threshold of 25 TeV leads to the observation of 14 cascadelike events, again consistent with the prediction of 3.0 atmospheric neutrino and 7.7 atmospheric muon events. We hence set an upper limit of E2Φlim≤7.46×10-8GeVsr-1s-1cm-2 (90% C.L.) on the diffuse flux from astrophysical neutrinos of all neutrino flavors, applicable to the energy range 25 TeV to 5 PeV, assuming an Eν-2 spectrum and a neutrino flavor ratio of 1 at the Earth. The third analysis utilized a larger and optimized sample of atmospheric muon background simulation, leading to a higher energy threshold of 100 TeV. Three events were found over a background prediction of 0.04 atmospheric muon events and 0.21 events from the flux of conventional and prompt atmospheric neutrinos. Including systematic errors this corresponds to a 2.7σ excess with respect to the background-only hypothesis. Our observation of neutrino event candidates above 100 TeV complements IceCube's recently observed evidence for high-energy astrophysical neutrinos.

AB - We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three complementary searches were performed, each optimized for different energy regimes. The analysis with the lowest energy threshold (2 TeV) targeted atmospheric neutrinos. A total of 67 events were found, consistent with the expectation of 41 atmospheric muons and 30 atmospheric neutrino events. The two other analyses targeted a harder, astrophysical neutrino flux. The analysis with an intermediate threshold of 25 TeV leads to the observation of 14 cascadelike events, again consistent with the prediction of 3.0 atmospheric neutrino and 7.7 atmospheric muon events. We hence set an upper limit of E2Φlim≤7.46×10-8GeVsr-1s-1cm-2 (90% C.L.) on the diffuse flux from astrophysical neutrinos of all neutrino flavors, applicable to the energy range 25 TeV to 5 PeV, assuming an Eν-2 spectrum and a neutrino flavor ratio of 1 at the Earth. The third analysis utilized a larger and optimized sample of atmospheric muon background simulation, leading to a higher energy threshold of 100 TeV. Three events were found over a background prediction of 0.04 atmospheric muon events and 0.21 events from the flux of conventional and prompt atmospheric neutrinos. Including systematic errors this corresponds to a 2.7σ excess with respect to the background-only hypothesis. Our observation of neutrino event candidates above 100 TeV complements IceCube's recently observed evidence for high-energy astrophysical neutrinos.

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ER -

Search for neutrino-induced particle showers with IceCube-40

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