A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube
- Autores
- Aartsen, M. G.; Abraham, K.; Ackermann, M.; Adams, J.; Aguilar, J. A.; Golup, Geraldina Tamara; Wallraff, M.; Wandkowsky, N.; Weaver, Ch.; Wendt, C.; Westerhoff, S.; Whelan, B. J.; Whitehorn, N.; Wichary, C.; Wiebe, K.; Wiebusch, C. H.; Wille, L.; Williams, D. R.; Wissing, H.; Wolf, M.; Wood, T. R.; Woschnagg, K.; Xu, D. L.; Xu, X. W.; Xu, Y.; Yanez, J. P.; Yodh, G.; Yoshida, S.; Zarzhitsky, P.; Zoll, M.; The IceCube Collaboration
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search for neutrino events with deposited energies > 30 TeV and interaction vertices inside the instrumented volume. Recent analyses suggest that the extraterrestrial flux extends to lower energies and is also visible with throughgoing, νμ-induced tracks from the Northern Hemisphere. Here, we combine the results from six different IceCube searches for astrophysical neutrinos in a maximum-likelihood analysis. The combined event sample features high-statistics samples of shower-like and track-like events. The data are fit in up to three observables: energy, zenith angle, and event topology. Assuming the astrophysical neutrino flux to be isotropic and to consist of equal flavors at Earth, the all-flavor spectrum with neutrino energies between 25 TeV and 2.8 PeV is well described by an unbroken power law with best-fit spectral index −2.50 ± 0.09 and a flux at 100 TeV of ({6.7}_{-1.2}^{+1.1})\times {10}^{-18}\;{\mathrm{GeV}}^{-1}\;{{\rm{s}}}^{-1}\;{\mathrm{sr}}^{-1}\;{\mathrm{cm}}^{-2}. Under the same assumptions, an unbroken power law with index −2 is disfavored with a significance of 3.8σ (p = 0.0066%) with respect to the best fit. This significance is reduced to 2.1σ (p = 1.7%) if instead we compare the best fit to a spectrum with index −2 that has an exponential cut-off at high energies. Allowing the electron-neutrino flux to deviate from the other two flavors, we find a νe fraction of 0.18 ± 0.11 at Earth. The sole production of electron neutrinos, which would be characteristic of neutron-decay-dominated sources, is rejected with a significance of 3.6σ (p = 0.014%).
Fil: Aartsen, M. G.. University of Adelaide; Australia
Fil: Abraham, K.. Technische Universitat Munchen; Alemania
Fil: Ackermann, M.. Deutsches Elektronen Synchrotron; Alemania
Fil: Adams, J.. University Of Canterbury; Nueva Zelanda
Fil: Aguilar, J. A.. Université Libre de Bruxelles; Bélgica
Fil: Golup, Geraldina Tamara. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Wallraff, M.. Rwth Aachen University; Alemania
Fil: Wandkowsky, N.. University of Wisconsin; Estados Unidos
Fil: Weaver, Ch.. University of Wisconsin; Estados Unidos
Fil: Wendt, C.. University of Wisconsin; Estados Unidos
Fil: Westerhoff, S.. University of Wisconsin; Estados Unidos
Fil: Whelan, B. J.. University of Adelaide; Australia
Fil: Whitehorn, N.. University of Wisconsin; Estados Unidos
Fil: Wichary, C.. Rwth Aachen University; Alemania
Fil: Wiebe, K.. Johannes Gutenberg Universitat Mainz; Alemania
Fil: Wiebusch, C. H.. Rwth Aachen University; Alemania
Fil: Wille, L.. University of Wisconsin; Estados Unidos
Fil: Williams, D. R.. University of Alabama at Birmingahm; Estados Unidos
Fil: Wissing, H.. University of Maryland; Estados Unidos
Fil: Wolf, M.. Stockholms Universitet; Suecia
Fil: Wood, T. R.. Universidad de Ginebra; Suiza
Fil: Woschnagg, K.. University of California; Estados Unidos
Fil: Xu, D. L.. University of Alabama at Birmingahm; Estados Unidos
Fil: Xu, X. W.. Chiba University; Japón
Fil: Xu, Y.. Stony Brook University; Estados Unidos
Fil: Yanez, J. P.. Deutsches Elektronen Synchrotron; Alemania
Fil: Yodh, G.. South Dakota School of Mines and Technology; Estados Unidos
Fil: Yoshida, S.. Chiba University; Japón
Fil: Zarzhitsky, P.. University of Alabama at Birmingahm; Estados Unidos
Fil: Zoll, M.. Stockholms Universitet; Suecia
Fil: The IceCube Collaboration. No especifica; - Materia
-
Neutrinos
Astroparticle Physics
Methods: Data Analysis - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/62855
Ver los metadatos del registro completo
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A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCubeAartsen, M. G.Abraham, K.Ackermann, M.Adams, J.Aguilar, J. A.Golup, Geraldina TamaraWallraff, M.Wandkowsky, N.Weaver, Ch.Wendt, C.Westerhoff, S.Whelan, B. J.Whitehorn, N.Wichary, C.Wiebe, K.Wiebusch, C. H.Wille, L.Williams, D. R.Wissing, H.Wolf, M.Wood, T. R.Woschnagg, K.Xu, D. L.Xu, X. W.Xu, Y.Yanez, J. P.Yodh, G.Yoshida, S.Zarzhitsky, P.Zoll, M.The IceCube CollaborationNeutrinosAstroparticle PhysicsMethods: Data Analysishttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search for neutrino events with deposited energies > 30 TeV and interaction vertices inside the instrumented volume. Recent analyses suggest that the extraterrestrial flux extends to lower energies and is also visible with throughgoing, νμ-induced tracks from the Northern Hemisphere. Here, we combine the results from six different IceCube searches for astrophysical neutrinos in a maximum-likelihood analysis. The combined event sample features high-statistics samples of shower-like and track-like events. The data are fit in up to three observables: energy, zenith angle, and event topology. Assuming the astrophysical neutrino flux to be isotropic and to consist of equal flavors at Earth, the all-flavor spectrum with neutrino energies between 25 TeV and 2.8 PeV is well described by an unbroken power law with best-fit spectral index −2.50 ± 0.09 and a flux at 100 TeV of ({6.7}_{-1.2}^{+1.1})\times {10}^{-18}\;{\mathrm{GeV}}^{-1}\;{{\rm{s}}}^{-1}\;{\mathrm{sr}}^{-1}\;{\mathrm{cm}}^{-2}. Under the same assumptions, an unbroken power law with index −2 is disfavored with a significance of 3.8σ (p = 0.0066%) with respect to the best fit. This significance is reduced to 2.1σ (p = 1.7%) if instead we compare the best fit to a spectrum with index −2 that has an exponential cut-off at high energies. Allowing the electron-neutrino flux to deviate from the other two flavors, we find a νe fraction of 0.18 ± 0.11 at Earth. The sole production of electron neutrinos, which would be characteristic of neutron-decay-dominated sources, is rejected with a significance of 3.6σ (p = 0.014%).Fil: Aartsen, M. G.. University of Adelaide; AustraliaFil: Abraham, K.. Technische Universitat Munchen; AlemaniaFil: Ackermann, M.. Deutsches Elektronen Synchrotron; AlemaniaFil: Adams, J.. University Of Canterbury; Nueva ZelandaFil: Aguilar, J. A.. Université Libre de Bruxelles; BélgicaFil: Golup, Geraldina Tamara. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Wallraff, M.. Rwth Aachen University; AlemaniaFil: Wandkowsky, N.. University of Wisconsin; Estados UnidosFil: Weaver, Ch.. University of Wisconsin; Estados UnidosFil: Wendt, C.. University of Wisconsin; Estados UnidosFil: Westerhoff, S.. University of Wisconsin; Estados UnidosFil: Whelan, B. J.. University of Adelaide; AustraliaFil: Whitehorn, N.. University of Wisconsin; Estados UnidosFil: Wichary, C.. Rwth Aachen University; AlemaniaFil: Wiebe, K.. Johannes Gutenberg Universitat Mainz; AlemaniaFil: Wiebusch, C. H.. Rwth Aachen University; AlemaniaFil: Wille, L.. University of Wisconsin; Estados UnidosFil: Williams, D. R.. University of Alabama at Birmingahm; Estados UnidosFil: Wissing, H.. University of Maryland; Estados UnidosFil: Wolf, M.. Stockholms Universitet; SueciaFil: Wood, T. R.. Universidad de Ginebra; SuizaFil: Woschnagg, K.. University of California; Estados UnidosFil: Xu, D. L.. University of Alabama at Birmingahm; Estados UnidosFil: Xu, X. W.. Chiba University; JapónFil: Xu, Y.. Stony Brook University; Estados UnidosFil: Yanez, J. P.. Deutsches Elektronen Synchrotron; AlemaniaFil: Yodh, G.. South Dakota School of Mines and Technology; Estados UnidosFil: Yoshida, S.. Chiba University; JapónFil: Zarzhitsky, P.. University of Alabama at Birmingahm; Estados UnidosFil: Zoll, M.. Stockholms Universitet; SueciaFil: The IceCube Collaboration. No especifica;IOP Publishing2015-08-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/62855Aartsen, M. G.; Abraham, K.; Ackermann, M.; Adams, J.; Aguilar, J. A.; et al.; A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube; IOP Publishing; Astrophysical Journal; 809; 1; 13-8-2015; 1-160004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/809/1/98info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/809/1/98info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1507.03991info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:59Zoai:ri.conicet.gov.ar:11336/62855instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:31:59.64CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
title |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
spellingShingle |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube Aartsen, M. G. Neutrinos Astroparticle Physics Methods: Data Analysis |
title_short |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
title_full |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
title_fullStr |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
title_full_unstemmed |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
title_sort |
A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube |
dc.creator.none.fl_str_mv |
Aartsen, M. G. Abraham, K. Ackermann, M. Adams, J. Aguilar, J. A. Golup, Geraldina Tamara Wallraff, M. Wandkowsky, N. Weaver, Ch. Wendt, C. Westerhoff, S. Whelan, B. J. Whitehorn, N. Wichary, C. Wiebe, K. Wiebusch, C. H. Wille, L. Williams, D. R. Wissing, H. Wolf, M. Wood, T. R. Woschnagg, K. Xu, D. L. Xu, X. W. Xu, Y. Yanez, J. P. Yodh, G. Yoshida, S. Zarzhitsky, P. Zoll, M. The IceCube Collaboration |
author |
Aartsen, M. G. |
author_facet |
Aartsen, M. G. Abraham, K. Ackermann, M. Adams, J. Aguilar, J. A. Golup, Geraldina Tamara Wallraff, M. Wandkowsky, N. Weaver, Ch. Wendt, C. Westerhoff, S. Whelan, B. J. Whitehorn, N. Wichary, C. Wiebe, K. Wiebusch, C. H. Wille, L. Williams, D. R. Wissing, H. Wolf, M. Wood, T. R. Woschnagg, K. Xu, D. L. Xu, X. W. Xu, Y. Yanez, J. P. Yodh, G. Yoshida, S. Zarzhitsky, P. Zoll, M. The IceCube Collaboration |
author_role |
author |
author2 |
Abraham, K. Ackermann, M. Adams, J. Aguilar, J. A. Golup, Geraldina Tamara Wallraff, M. Wandkowsky, N. Weaver, Ch. Wendt, C. Westerhoff, S. Whelan, B. J. Whitehorn, N. Wichary, C. Wiebe, K. Wiebusch, C. H. Wille, L. Williams, D. R. Wissing, H. Wolf, M. Wood, T. R. Woschnagg, K. Xu, D. L. Xu, X. W. Xu, Y. Yanez, J. P. Yodh, G. Yoshida, S. Zarzhitsky, P. Zoll, M. The IceCube Collaboration |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.subject.none.fl_str_mv |
Neutrinos Astroparticle Physics Methods: Data Analysis |
topic |
Neutrinos Astroparticle Physics Methods: Data Analysis |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search for neutrino events with deposited energies > 30 TeV and interaction vertices inside the instrumented volume. Recent analyses suggest that the extraterrestrial flux extends to lower energies and is also visible with throughgoing, νμ-induced tracks from the Northern Hemisphere. Here, we combine the results from six different IceCube searches for astrophysical neutrinos in a maximum-likelihood analysis. The combined event sample features high-statistics samples of shower-like and track-like events. The data are fit in up to three observables: energy, zenith angle, and event topology. Assuming the astrophysical neutrino flux to be isotropic and to consist of equal flavors at Earth, the all-flavor spectrum with neutrino energies between 25 TeV and 2.8 PeV is well described by an unbroken power law with best-fit spectral index −2.50 ± 0.09 and a flux at 100 TeV of ({6.7}_{-1.2}^{+1.1})\times {10}^{-18}\;{\mathrm{GeV}}^{-1}\;{{\rm{s}}}^{-1}\;{\mathrm{sr}}^{-1}\;{\mathrm{cm}}^{-2}. Under the same assumptions, an unbroken power law with index −2 is disfavored with a significance of 3.8σ (p = 0.0066%) with respect to the best fit. This significance is reduced to 2.1σ (p = 1.7%) if instead we compare the best fit to a spectrum with index −2 that has an exponential cut-off at high energies. Allowing the electron-neutrino flux to deviate from the other two flavors, we find a νe fraction of 0.18 ± 0.11 at Earth. The sole production of electron neutrinos, which would be characteristic of neutron-decay-dominated sources, is rejected with a significance of 3.6σ (p = 0.014%). Fil: Aartsen, M. G.. University of Adelaide; Australia Fil: Abraham, K.. Technische Universitat Munchen; Alemania Fil: Ackermann, M.. Deutsches Elektronen Synchrotron; Alemania Fil: Adams, J.. University Of Canterbury; Nueva Zelanda Fil: Aguilar, J. A.. Université Libre de Bruxelles; Bélgica Fil: Golup, Geraldina Tamara. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina Fil: Wallraff, M.. Rwth Aachen University; Alemania Fil: Wandkowsky, N.. University of Wisconsin; Estados Unidos Fil: Weaver, Ch.. University of Wisconsin; Estados Unidos Fil: Wendt, C.. University of Wisconsin; Estados Unidos Fil: Westerhoff, S.. University of Wisconsin; Estados Unidos Fil: Whelan, B. J.. University of Adelaide; Australia Fil: Whitehorn, N.. University of Wisconsin; Estados Unidos Fil: Wichary, C.. Rwth Aachen University; Alemania Fil: Wiebe, K.. Johannes Gutenberg Universitat Mainz; Alemania Fil: Wiebusch, C. H.. Rwth Aachen University; Alemania Fil: Wille, L.. University of Wisconsin; Estados Unidos Fil: Williams, D. R.. University of Alabama at Birmingahm; Estados Unidos Fil: Wissing, H.. University of Maryland; Estados Unidos Fil: Wolf, M.. Stockholms Universitet; Suecia Fil: Wood, T. R.. Universidad de Ginebra; Suiza Fil: Woschnagg, K.. University of California; Estados Unidos Fil: Xu, D. L.. University of Alabama at Birmingahm; Estados Unidos Fil: Xu, X. W.. Chiba University; Japón Fil: Xu, Y.. Stony Brook University; Estados Unidos Fil: Yanez, J. P.. Deutsches Elektronen Synchrotron; Alemania Fil: Yodh, G.. South Dakota School of Mines and Technology; Estados Unidos Fil: Yoshida, S.. Chiba University; Japón Fil: Zarzhitsky, P.. University of Alabama at Birmingahm; Estados Unidos Fil: Zoll, M.. Stockholms Universitet; Suecia Fil: The IceCube Collaboration. No especifica; |
description |
Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search for neutrino events with deposited energies > 30 TeV and interaction vertices inside the instrumented volume. Recent analyses suggest that the extraterrestrial flux extends to lower energies and is also visible with throughgoing, νμ-induced tracks from the Northern Hemisphere. Here, we combine the results from six different IceCube searches for astrophysical neutrinos in a maximum-likelihood analysis. The combined event sample features high-statistics samples of shower-like and track-like events. The data are fit in up to three observables: energy, zenith angle, and event topology. Assuming the astrophysical neutrino flux to be isotropic and to consist of equal flavors at Earth, the all-flavor spectrum with neutrino energies between 25 TeV and 2.8 PeV is well described by an unbroken power law with best-fit spectral index −2.50 ± 0.09 and a flux at 100 TeV of ({6.7}_{-1.2}^{+1.1})\times {10}^{-18}\;{\mathrm{GeV}}^{-1}\;{{\rm{s}}}^{-1}\;{\mathrm{sr}}^{-1}\;{\mathrm{cm}}^{-2}. Under the same assumptions, an unbroken power law with index −2 is disfavored with a significance of 3.8σ (p = 0.0066%) with respect to the best fit. This significance is reduced to 2.1σ (p = 1.7%) if instead we compare the best fit to a spectrum with index −2 that has an exponential cut-off at high energies. Allowing the electron-neutrino flux to deviate from the other two flavors, we find a νe fraction of 0.18 ± 0.11 at Earth. The sole production of electron neutrinos, which would be characteristic of neutron-decay-dominated sources, is rejected with a significance of 3.6σ (p = 0.014%). |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-08-13 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/62855 Aartsen, M. G.; Abraham, K.; Ackermann, M.; Adams, J.; Aguilar, J. A.; et al.; A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube; IOP Publishing; Astrophysical Journal; 809; 1; 13-8-2015; 1-16 0004-637X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/62855 |
identifier_str_mv |
Aartsen, M. G.; Abraham, K.; Ackermann, M.; Adams, J.; Aguilar, J. A.; et al.; A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube; IOP Publishing; Astrophysical Journal; 809; 1; 13-8-2015; 1-16 0004-637X CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/809/1/98 info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/809/1/98 info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1507.03991 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
IOP Publishing |
publisher.none.fl_str_mv |
IOP Publishing |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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