Astrophysical neutrino flux measurement and search for nutau induced cascades with 11 years of IceCube data
Abstract
IceCube measured the diffuse astrophysical neutrino flux for all flavors up to PeV energies. The high energy (TeV-PeV) IceCube cascade sample is particularly effective at selecting electron and tau neutrinos. We present the results of Single Power Law (SPL) and Broken Power Law (BPL) flux measurements based on 11 years of cascade data. From this cascade sample, we study the identification of high energy (~100 TeV) tau neutrinos by detecting a double cascade signature produced by a charged-current neutrino interaction and the subsequent decay of the tau lepton. A Boosted Decision Tree (BDT) is employed to search for the double cascade signature, achieving a significantly improved signal-to-background ratio of 9:1 compared to previous analyses. The selected sample has a tau-neutrino purity of approximately 90% and a weighted mean reconstruction error on the tau decay length of about 4m. We present sensitivities for a maximum likelihood fit of the flavor composition and constraints on the astrophysical neutrino flavor ratios using this sample in combination with IceCube’s northern muon neutrino-induced track sample.
Authors 97
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RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
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RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
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RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
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Affiliation as printed
Université Libre de Bruxelles , Science Faculty CP230 , B-1050 Brussels , Belgium
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University of California, Berkeley
Affiliation as printed
Dept. of Physics , University of California , Berkeley , CA 94720 , USA
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Affiliation as printed
Fakultät für Physik & Astronomie , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
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Georgia Institute of Technology
Affiliation as printed
School of Physics and Center for Relativistic Astrophysics , Georgia Institute of Technology , Atlanta , GA 30332 , USA
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Affiliation as printed
Department of Physics , University of Adelaide , Adelaide , 5005 , Australia
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RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
-
Affiliation as printed
Université Libre de Bruxelles , Science Faculty CP230 , B-1050 Brussels , Belgium
-
RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
-
RWTH Aachen University · Stony Brook University
Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
Stony Brook University
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Southern University and Agricultural and Mechanical College
Affiliation as printed
Dept. of Physics , Southern University , Baton Rouge , LA 70813 , USA
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