Author: "Ahrens, M." / Topic: nuclear - Searchworks@Jio Institute Digital Library Search Results

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183 results on '"Ahrens, M."'

1. IceCube Search for Neutrinos Coincident with Gravitational Wave Events from LIGO/Virgo Run O3

Author: Abbasi, R, Ackermann, M, Adams, J, Aggarwal, N, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Asali, Y, Ashida, Y, Athanasiadou, S, Axani, S, Bai, X, V., A Balagopal, Baricevic, M, Bartos, I, Barwick, SW, Basu, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Beise, J, Bellenghi, C, Benda, S, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bontempo, F, Book, JY, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Classen, L, Coleman, A, Collin, GH, Connolly, A, Conrad, JM, Coppin, P, Correa, P, Countryman, ST, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, DeLaunay, JJ, López, D Delgado, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, DuVernois, MA, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Fedynitch, A, Feigl, N, Fiedlschuster, S, Fienberg, AT, and Finley, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Astronomical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: Using data from the IceCube Neutrino Observatory, we searched for high-energy neutrino emission from the gravitational-wave events detected by the advanced LIGO and Virgo detectors during their third observing run. We did a low-latency follow-up on the public candidate events released during the detectors' third observing run and an archival search on the 80 confident events reported in the GWTC-2.1 and GWTC-3 catalogs. An extended search was also conducted for neutrino emission on longer timescales from neutron star containing mergers. Follow-up searches on the candidate optical counterpart of GW190521 were also conducted. We used two methods; an unbinned maximum likelihood analysis and a Bayesian analysis using astrophysical priors, both of which were previously used to search for high-energy neutrino emission from gravitational-wave events. No significant neutrino emission was observed by any analysis, and upper limits were placed on the time-integrated neutrino flux as well as the total isotropic equivalent energy emitted in high-energy neutrinos.
Published: 2023

2. Searches for Neutrinos from Gamma-Ray Bursts Using the IceCube Neutrino Observatory

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Ashida, Y, Athanasiadou, S, Axani, S, Bai, X, V., A Balagopal, Barwick, SW, Basu, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Beise, J, Bellenghi, C, Benda, S, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Boddenberg, M, Bontempo, F, Book, JY, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Connolly, A, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, DeLaunay, JJ, López, D Delgado, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, DuVernois, MA, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Fedynitch, A, Feigl, N, Fiedlschuster, S, Fienberg, AT, Finley, C, Fischer, L, and Fox, D
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CSD-01-AMOS-A, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: Gamma-ray bursts (GRBs) are considered as promising sources of ultra-high-energy cosmic rays (UHECRs) due to their large power output. Observing a neutrino flux from GRBs would offer evidence that GRBs are hadronic accelerators of UHECRs. Previous IceCube analyses, which primarily focused on neutrinos arriving in temporal coincidence with the prompt gamma-rays, found no significant neutrino excess. The four analyses presented in this paper extend the region of interest to 14 days before and after the prompt phase, including generic extended time windows and targeted precursor searches. GRBs were selected between 2011 May and 2018 October to align with the data set of candidate muon-neutrino events observed by IceCube. No evidence of correlation between neutrino events and GRBs was found in these analyses. Limits are set to constrain the contribution of the cosmic GRB population to the diffuse astrophysical neutrino flux observed by IceCube. Prompt neutrino emission from GRBs is limited to 21% of the observed diffuse neutrino flux, and emission on timescales up to 104 s is constrained to 24% of the total diffuse flux.
Published: 2022

3. Search for Astrophysical Neutrinos from 1FLE Blazars with IceCube

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Ashida, Y, Athanasiadou, S, Axani, S, Bai, X, V., A Balagopal, Baricevic, M, Barwick, SW, Basu, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Beise, J, Bellenghi, C, Benda, S, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bontempo, F, Book, JY, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Classen, L, Coleman, A, Collin, GH, Connolly, A, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, DeLaunay, JJ, López, D Delgado, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, DuVernois, MA, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Fedynitch, A, Feigl, N, Fiedlschuster, S, Fienberg, AT, Finley, C, Fischer, L, Fox, D, Franckowiak, A, and Friedman, E
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Particle astrophysics, High energy astrophysics, Cosmic ray sources, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: The majority of astrophysical neutrinos have undetermined origins. The IceCube Neutrino Observatory has observed astrophysical neutrinos but has not yet identified their sources. Blazars are promising source candidates, but previous searches for neutrino emission from populations of blazars detected in ≳ GeV gamma rays have not observed any significant neutrino excess. Recent findings in multimessenger astronomy indicate that high-energy photons, coproduced with high-energy neutrinos, are likely to be absorbed and reemitted at lower energies. Thus, lower-energy photons may be better indicators of TeV-PeV neutrino production. This paper presents the first time-integrated stacking search for astrophysical neutrino emission from MeV-detected blazars in the first Fermi Large Area Telescope low energy (1FLE) catalog using ten years of IceCube muon-neutrino data. The results of this analysis are found to be consistent with a background-only hypothesis. Assuming an E-2 neutrino spectrum and proportionality between the blazars MeV gamma-ray fluxes and TeV-PeV neutrino flux, the upper limit on the 1FLE blazar energy-scaled neutrino flux is determined to be 1.64 × 10-12 TeV cm-2 s-1 at 90% confidence level. This upper limit is approximately 1% of IceCube's diffuse muon-neutrino flux measurement.
Published: 2022

4. Density of GeV muons in air showers measured with IceTop.

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Ashida, Y, Axani, S, Bai, X, Balagopal V, A, Barwick, SW, Bastian, B, Basu, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Becker Tjus, J, Beise, J, Bellenghi, C, Benda, S, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Boddenberg, M, Bontempo, F, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Browne, S, Burgman, A, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, Delaunay, JJ, Delgado López, D, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, Dunkman, M, Duvernois, MA, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Fedynitch, A, Feigl, N, Fiedlschuster, S, Fienberg, AT, and Finley, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We present a measurement of the density of GeV muons in near-vertical air showers using three years of data recorded by the IceTop array at the South Pole. Depending on the shower size, the muon densities have been measured at lateral distances between 200 and 1000 m. From these lateral distributions, we derive the muon densities as functions of energy at reference distances of 600 and 800 m for primary energies between 2.5 and 40 PeV and between 9 and 120 PeV, respectively. The muon densities are determined using, as a baseline, the hadronic interaction model Sibyll 2.1 together with various composition models. The measurements are consistent with the predicted muon densities within these baseline interaction and composition models. The measured muon densities have also been compared to simulations using the post-LHC models EPOS-LHC and QGSJet-II.04. The result of this comparison is that the post-LHC models together with any given composition model yield higher muon densities than observed. This is in contrast to the observations above 1 EeV where all model simulations yield for any mass composition lower muon densities than the measured ones. The post-LHC models in general feature higher muon densities so that the agreement with experimental data at the highest energies is improved but the muon densities are not correct in the energy range between 2.5 and about 100 PeV.
Published: 2022

5. Search for GeV-scale dark matter annihilation in the Sun with IceCube DeepCore

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Ashida, Y, Axani, S, Bai, X, Balagopal, A, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Boddenberg, M, Bontempo, F, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Browne, S, Burgman, A, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, DeLaunay, JJ, López, D Delgado, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Feigl, N, Fiedlschuster, S, Fienberg, AT, and Filimonov, K
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: The Sun provides an excellent target for studying spin-dependent dark matter-proton scattering due to its high matter density and abundant hydrogen content. Dark matter particles from the Galactic halo can elastically interact with Solar nuclei, resulting in their capture and thermalization in the Sun. The captured dark matter can annihilate into Standard Model particles including an observable flux of neutrinos. We present the results of a search for low-energy (
Published: 2022

6. Improved Characterization of the Astrophysical Muon–neutrino Flux with 9.5 Years of IceCube Data

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alameddine, JM, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Anton, G, Argüelles, C, Ashida, Y, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Boddenberg, M, Bontempo, F, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Brinson, B, Bron, S, Brostean-Kaiser, J, Browne, S, Burgman, A, Burley, RT, Busse, RS, Campana, MA, Carnie-Bronca, EG, Chen, C, Chen, Z, Chirkin, D, Choi, K, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dappen, C, Dave, P, De Clercq, C, DeLaunay, JJ, López, D Delgado, Dembinski, H, Deoskar, K, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dittmer, M, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fan, KL, Fazely, AR, Feigl, N, Fiedlschuster, S, Fienberg, AT, and Filimonov, K
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: We present a measurement of the high-energy astrophysical muon-neutrino flux with the IceCube Neutrino Observatory. The measurement uses a high-purity selection of 650k neutrino-induced muon tracks from the northern celestial hemisphere, corresponding to 9.5 yr of experimental data. With respect to previous publications, the measurement is improved by the increased size of the event sample and the extended model testing beyond simple power-law hypotheses. An updated treatment of systematic uncertainties and atmospheric background fluxes has been implemented based on recent models. The best-fit single power-law parameterization for the astrophysical energy spectrum results in a normalization of φ@100TeVνμ+ν¯μ=1.44-0.26+0.25×10-18GeV-1cm-2s-1sr-1 and a spectral index γSPL=2.37-0.09+0.09, constrained in the energy range from 15 TeV to 5 PeV. The model tests include a single power law with a spectral cutoff at high energies, a log-parabola model, several source-class-specific flux predictions from the literature, and a model-independent spectral unfolding. The data are consistent with a single power-law hypothesis, however, spectra with softening above one PeV are statistically more favorable at a two-sigma level.
Published: 2022

7. Detection of astrophysical tau neutrino candidates in IceCube

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, Balagopal, AV, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Becker Tjus, J, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, Gallagher, J, and Ganster, E
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: High-energy tau neutrinos are rarely produced in atmospheric cosmic-ray showers or at cosmic particle accelerators, but are expected to emerge during neutrino propagation over cosmic distances due to flavor mixing. When high energy tau neutrinos interact inside the IceCube detector, two spatially separated energy depositions may be resolved, the first from the charged current interaction and the second from the tau lepton decay. We report a novel analysis of 7.5 years of IceCube data that identifies two candidate tau neutrinos among the 60 “High-Energy Starting Events” (HESE) collected during that period. The HESE sample offers high purity, all-sky sensitivity, and distinct observational signatures for each neutrino flavor, enabling a new measurement of the flavor composition. The measured astrophysical neutrino flavor composition is consistent with expectations, and an astrophysical tau neutrino flux is indicated at 2.8σ significance.
Published: 2022

8. First all-flavor search for transient neutrino emission using 3-years of IceCube DeepCore data

Author: collaboration, The IceCube, Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, and Gallagher, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, neutrino astronomy, neutrino experiments, gamma ray burst experiments, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract: Since the discovery of a flux of high-energy astrophysical neutrinos, searches for their origins have focused primarily at TeV-PeV energies. Compared to sub-TeV searches, high-energy searches benefit from an increase in the neutrino cross section, improved angular resolution on the neutrino direction, and a reduced background from atmospheric neutrinos and muons. However, the focus on high energy does not preclude the existence of sub-TeV neutrino emission where IceCube retains sensitivity. Here we present the first all-flavor search from IceCube for transient emission of low-energy neutrinos, focusing on the energy region of 5.6-100 GeV using three years of data obtained with the IceCube-DeepCore detector. We find no evidence of transient neutrino emission in the data, thus leading to a constraint on the volumetric rate of astrophysical transient sources in the range of ∼ 705-2301 Gpc-3 yr-1 for sources following a subphotospheric energy spectrum with a mean energy of 100 GeV and a bolometric energy of 1052 erg.
Published: 2022

9. All-flavor constraints on nonstandard neutrino interactions and generalized matter potential with three years of IceCube DeepCore data

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, An, R, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Ashida, Y, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bontempo, F, Borowka, J, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Browne, S, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, K, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Erpenbeck, H, Evans, J, Evenson, PA, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, and Fürst, P
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We report constraints on nonstandard neutrino interactions (NSI) from the observation of atmospheric neutrinos with IceCube, limiting all individual coupling strengths from a single dataset. Furthermore, IceCube is the first experiment to constrain flavor-violating and nonuniversal couplings simultaneously. Hypothetical NSI are generically expected to arise due to the exchange of a new heavy mediator particle. Neutrinos propagating in matter scatter off fermions in the forward direction with negligible momentum transfer. Hence the study of the matter effect on neutrinos propagating in the Earth is sensitive to NSI independently of the energy scale of new physics. We present constraints on NSI obtained with an all-flavor event sample of atmospheric neutrinos based on three years of IceCube DeepCore data. The analysis uses neutrinos arriving from all directions, with reconstructed energies between 5.6 GeV and 100 GeV. We report constraints on the individual NSI coupling strengths considered singly, allowing for complex phases in the case of flavor-violating couplings. This demonstrates that IceCube is sensitive to the full NSI flavor structure at a level competitive with limits from the global analysis of all other experiments. In addition, we investigate a generalized matter potential, whose overall scale and flavor structure are also constrained.
Published: 2021

10. Measurement of the high-energy all-flavor neutrino-nucleon cross section with IceCube

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, Gallagher, J, and Ganster, E
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: The flux of high-energy neutrinos passing through the Earth is attenuated due to their interactions with matter. The interaction rate is determined by the neutrino interaction cross section and affects the flux arriving at the IceCube Neutrino Observatory, a cubic-kilometer neutrino detector embedded in the Antarctic ice sheet. We present a measurement of the neutrino cross section between 60 TeV and 10 PeV using the high-energy starting event (HESE) sample from IceCube with 7.5 years of data. The result is binned in neutrino energy and obtained using both Bayesian and frequentist statistics. We find it compatible with predictions from the Standard Model. While the cross section is expected to be flavor independent above 1 TeV, additional constraints on the measurement are included through updated experimental particle identification (PID) classifiers, proxies for the three neutrino flavors. This is the first such measurement to use a ternary PID observable and the first to account for neutrinos from tau decay.
Published: 2021

11. IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, Gallagher, J, and Ganster, E
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux of astrophysical origin. This discovery was made using events interacting within a fiducial region of the detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as the high-energy starting event sample (HESE). We revisit the analysis of the HESE sample with an additional 4.5 years of data, newer glacial ice models, and improved systematics treatment. This paper describes the sample in detail, reports on the latest astrophysical neutrino flux measurements, and presents a source search for astrophysical neutrinos. We give the compatibility of these observations with specific isotropic flux models proposed in the literature as well as generic power-law-like scenarios. Assuming νe:νμ:ντ=1:1:1, and an equal flux of neutrinos and antineutrinos, we find that the astrophysical neutrino spectrum is compatible with an unbroken power law, with a preferred spectral index of 2.87-0.19+0.20 for the 68% confidence interval.
Published: 2021

12. IceCube-Gen2: the window to the extreme Universe

Author: Aartsen, MG, Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Allison, P, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Arlen, TC, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Balagopal, A, Barbano, A, Bartos, I, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Bohmer, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Burley, RT, Buscher, J, Busse, RS, Bustamante, M, Campana, MA, Carnie-Bronca, EG, Carver, T, Chen, C, Chen, P, Cheung, E, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Connolly, A, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Deaconu, C, De Clercq, C, DeLaunay, JJ, De Kockere, S, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, JJ, and Evenson, PA
Subjects: neutrino astronomy, high-energy astrophysics, neutrino telescopes, astro-ph.HE, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: The observation of electromagnetic radiation from radio to γ-ray wavelengths has provided a wealth of information about the Universe. However, at PeV (1015 eV) energies and above, most of the Universe is impenetrable to photons. New messengers, namely cosmic neutrinos, are needed to explore the most extreme environments of the Universe where black holes, neutron stars, and stellar explosions transform gravitational energy into non-thermal cosmic rays. These energetic particles havemillions of times higher energies than those produced in the most powerful particle accelerators on Earth. As neutrinos can escape from regions otherwise opaque to radiation, they allow an unique view deep into exploding stars and the vicinity of the event horizons of black holes. The discovery of cosmic neutrinos with IceCube has opened this new window on the Universe. IceCube has been successful in finding first evidence for cosmic particle acceleration in the jet of an active galactic nucleus. Yet, ultimately, its sensitivity is too limited to detect even the brightest neutrino sources with high significance, or to detect populations of less luminous sources. In thiswhite paper, we present an overview of a next-generation instrument, IceCube-Gen2, which will sharpen our understanding of the processes and environments that govern the Universe at the highest energies. IceCube-Gen2 is designed to: (a) Resolve the high-energy neutrino sky from TeV to EeV energies (b) Investigate cosmic particle acceleration through multi-messenger observations (c) Reveal the sources and propagation of the highest energy particles in the Universe (d) Probe fundamental physics with high-energy neutrinos IceCube-Gen2 will enhance the existing IceCube detector at the South Pole. It will increase the annual rate of observed cosmic neutrinos by a factor of ten compared to IceCube, and will be able to detect sources five times fainter than its predecessor. Furthermore, through the addition of a radio array, IceCube- Gen2 will extend the energy range by several orders of magnitude compared to IceCube. Construction will take 8 years and cost about $350M. The goal is to have IceCube-Gen2 fully operational by 2033. IceCube-Gen2 will play an essential role in shaping the new era of multimessenger astronomy, fundamentally advancing our knowledge of the highenergy Universe. This challenging mission can be fully addressed only through the combination of the information from the neutrino, electromagnetic, and gravitational wave emission of high-energy sources, in concert with the new survey instruments across the electromagnetic spectrum and gravitational wave detectors which will be available in the coming years.
Published: 2021

13. Search for GeV neutrino emission during intense gamma-ray solar flares with the IceCube Neutrino Observatory

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, An, R, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Vélez, JC Díaz, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, and Gallagher, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Astronomical Sciences, Physical Sciences, astro-ph.HE, astro-ph.SR, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Solar flares convert magnetic energy into thermal and nonthermal plasma energy, the latter implying particle acceleration of charged particles such as protons. Protons are injected out of the coronal acceleration region and can interact with dense plasma in the lower solar atmosphere, producing mesons that subsequently decay into gamma rays and neutrinos at O(MeV-GeV) energies. We present the results of the first search for GeV neutrinos emitted during solar flares carried out with the IceCube Neutrino Observatory. While the experiment was originally designed to detect neutrinos with energies between 10 GeV and a few PeV, a new approach allowing for a O(GeV) energy threshold will be presented. The resulting limits allow us to constrain some of the theoretical estimates of the expected neutrino flux.
Published: 2021

14. A search for time-dependent astrophysical neutrino emission with icecube data from 2012 to 2017

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, JA, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, Balagopal V, A, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Becker Tjus, J, Bellenghi, C, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, Gallagher, J, and Ganster, E
Subjects: Particle astrophysics, High-energy astrophysics, Cosmic ray sources, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: High-energy neutrinos are unique messengers of the high-energy universe, tracing the processes of cosmic ray acceleration. This paper presents analyses focusing on time-dependent neutrino point-source searches. A scan of the whole sky, making no prior assumption about source candidates, is performed, looking for a space and time clustering of high-energy neutrinos in data collected by the IceCube Neutrino Observatory between 2012 and 2017. No statistically significant evidence for a time-dependent neutrino signal is found with this search during this period, as all results are consistent with the background expectation. Within this study period, the blazar 3C 279, showed strong variability, inducing a very prominent gamma-ray flare observed in 2015 June. This event motivated a dedicated study of the blazar, which consists of searching for a time-dependent neutrino signal correlated with the gamma-ray emission. No evidence for a time-dependent signal is found. Hence, an upper limit on the neutrino fluence is derived, allowing us to constrain a hadronic emission model.
Published: 2021

15. Follow-up of Astrophysical Transients in Real Time with the IceCube Neutrino Observatory

Author: Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Alves, AA, Amin, NM, An, R, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Axani, S, Bai, X, Balagopal V., A, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Tjus, JB, Bellenghi, C, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Campana, MA, Chen, C, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, Delaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Duvernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evans, J, Evenson, PA, Fahey, S, Fazely, AR, Fiedlschuster, S, Fienberg, AT, Filimonov, K, Finley, C, Fischer, L, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Fürst, P, Gaisser, TK, and Gallagher, J
Subjects: Neutrino astronomy, High energy astrophysics, astro-ph.HE, astro-ph.IM, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: In multi-messenger astronomy, rapid investigation of interesting transients is imperative. As an observatory with a 4π steradian field of view, and ∼99% uptime, the IceCube Neutrino Observatory is a unique facility to follow up transients, as well as to provide valuable insights for other observatories and inform their observational decisions. Since 2016, IceCube has been using low-latency data to rapidly respond to interesting astrophysical events reported by the multi-messenger observational community. Here, we describe the pipeline used to perform these followup analyses, and provide a summary of the 58 analyses performed as of July 2020. We find no significant signal in the first 58 analyses performed. The pipeline has helped inform various electromagnetic observation strategies, and has constrained neutrino emission from potential hadronic cosmic accelerators.
Published: 2021

16. Measurements of the time-dependent cosmic-ray Sun shadow with seven years of IceCube data: Comparison with the Solar cycle and magnetic field models

Author: Aartsen, MG, Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Balagopal, AV, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Fichtner, H, Fienberg, AT, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, and Gaisser, TK
Subjects: Astronomical Sciences, Physical Sciences, astro-ph.HE, astro-ph.SR, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Observations of the time-dependent cosmic-ray Sun shadow have been proven as a valuable diagnostic for the assessment of solar magnetic field models. In this paper, seven years of IceCube data are compared to solar activity and solar magnetic field models. A quantitative comparison of solar magnetic field models with IceCube data on the event rate level is performed for the first time. Additionally, a first energy-dependent analysis is presented and compared to recent predictions. We use seven years of IceCube data for the moon and the Sun and compare them to simulations on data rate level. The simulations are performed for the geometrical shadow hypothesis for the moon and the Sun and for a cosmic-ray propagation model governed by the solar magnetic field for the case of the Sun. We find that a linearly decreasing relationship between Sun shadow strength and solar activity is preferred over a constant relationship at the 6.4σ level. We test two commonly used models of the coronal magnetic field, both combined with a Parker spiral, by modeling cosmic-ray propagation in the solar magnetic field. Both models predict a weakening of the shadow in times of high solar activity as it is also visible in the data. We find tensions with the data on the order of 3σ for both models, assuming only statistical uncertainties. The magnetic field model CSSS fits the data slightly better than the PFSS model. This is generally consistent with what is found previously by the Tibet AS-γ Experiment; a deviation of the data from the two models is, however, not significant at this point. Regarding the energy dependence of the Sun shadow, we find indications that the shadowing effect increases with energy during times of high solar activity, in agreement with theoretical predictions.
Published: 2021

17. Searches for neutrinos from cosmic-ray interactions in the Sun using seven years of IceCube data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Astronomical Sciences, Physical Sciences, neutrino astronomy, neutrino detectors, neutrino experiments, solar and atmospheric neutrinos, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract: Cosmic-ray interactions with the solar atmosphere are expected to produce particle showers which in turn produce neutrinos from weak decays of mesons. These solar atmospheric neutrinos (SAνs) have never been observed experimentally. A detection would be an important step in understanding cosmic-ray propagation in the inner solar system and the dynamics of solar magnetic fields. SAνs also represent an irreducible background to solar dark matter searches and a detection would allow precise characterization of this background. Here, we present the first experimental search based on seven years of data collected from May 2010 to May 2017 in the austral winter with the IceCube Neutrino Observatory. An unbinned likelihood analysis is performed for events reconstructed within 5 degrees of the center of the Sun. No evidence for a SAν flux is observed. After inclusion of systematic uncertainties, we set a 90% upper limit of 1.02+0.20-0.18·10-13 GeV-1cm-2s-1 at 1 TeV.
Published: 2021

18. Multimessenger Gamma-Ray and Neutrino Coincidence Alerts Using HAWC and IceCube Subthreshold Data

Author: Solares, HA Ayala, Coutu, S, DeLaunay, JJ, Fox, DB, Grégoire, T, Keivani, A, Krauß, F, Mostafá, M, Murase, K, Turley, CF, Albert, A, Alfaro, R, Alvarez, C, Camacho, JR Angeles, Arteaga-Velázquez, JC, Arunbabu, KP, Rojas, D Avila, Belmont-Moreno, E, Brisbois, C, Caballero-Mora, KS, Carramiñana, A, Casanova, S, Cotti, U, De la Fuente, E, Hernandez, R Diaz, Dingus, BL, DuVernois, MA, Durocher, M, Díaz-Vélez, JC, Espinoza, C, Fan, KL, Fleischhack, H, Fraija, N, Galván-Gámez, A, Garcia, D, García-González, JA, Garfias, F, González, MM, Goodman, JA, Harding, JP, Hona, B, Huang, D, Hueyotl-Zahuantitla, F, Hüntemeyer, P, Iriarte, A, Jardin-Blicq, A, Joshi, V, Vargas, H León, Linnemann, JT, Longinotti, AL, Luis-Raya, G, Lundeen, J, Malone, K, Martinez, O, Martinez-Castellanos, I, Martínez-Castro, J, Matthews, JA, Miranda-Romagnoli, P, Moreno, E, Nellen, L, Newbold, M, Nisa, MU, Noriega-Papaqui, R, Peisker, A, Pérez-Pérez, EG, Rho, CD, Rosa-González, D, Salazar, H, Greus, F Salesa, Sandoval, A, Smith, AJ, Springer, RW, Tollefson, K, Torres, I, Torres-Escobedo, R, Ureña-Mena, F, Villaseñor, L, Weisgarber, T, Willox, E, Zepeda, A, Zhou, H, de León, C, Aartsen, MG, Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, and Bai, X
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: The High Altitude Water Cerenkov (HAWC) and IceCube observatories, through the Astrophysical Multimessenger Observatory Network (AMON) framework, have developed a multimessenger joint search for extragalactic astrophysical sources. This analysis looks for sources that emit both cosmic neutrinos and gamma rays that are produced in photohadronic or hadronic interactions. The AMON system is running continuously, receiving subthreshold data (i.e., data that are not suited on their own to do astrophysical searches) from HAWC and IceCube, and combining them in real time. Here we present the analysis algorithm, as well as results from archival data collected between 2015 June and 2018 August, with a total live time of 3.0 yr. During this period we found two coincident events that have a false-alarm rate (FAR) of
Published: 2021

19. Computational techniques for the analysis of small signals in high-statistics neutrino oscillation experiments

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Arlen, TC, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal, AV, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Becker Tjus, J, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Dáz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evans, JJ, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, and Gerhardt, L
Subjects: Data analysis, Monte Carlo, MC, Statistics, Smoothing, KDE, Neutrino, Neutrino mass ordering, Detector, FVLV nu T, physics.data-an, astro-ph.IM, hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences
Abstract: The current and upcoming generation of Very Large Volume Neutrino Telescopes – collecting unprecedented quantities of neutrino events – can be used to explore subtle effects in oscillation physics, such as (but not restricted to) the neutrino mass ordering. The sensitivity of an experiment to these effects can be estimated from Monte Carlo simulations. With the high number of events that will be collected, there is a trade-off between the computational expense of running such simulations and the inherent statistical uncertainty in the determined values. In such a scenario, it becomes impractical to produce and use adequately-sized sets of simulated events with traditional methods, such as Monte Carlo weighting. In this work we present a staged approach to the generation of expected distributions of observables in order to overcome these challenges. By combining multiple integration and smoothing techniques which address limited statistics from simulation it arrives at reliable analysis results using modest computational resources.
Published: 2020

20. Velocity independent constraints on spin-dependent DM-nucleon interactions from IceCube and PICO

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal V., A, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Becker Tjus, J, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, Glüsenkamp, T, and Goldschmidt, A
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Adopting the Standard Halo Model (SHM) of an isotropic Maxwellian velocity distribution for dark matter (DM) particles in the Galaxy, the most stringent current constraints on their spin-dependent scattering cross-section with nucleons come from the IceCube neutrino observatory and the PICO-60 C 3F 8 superheated bubble chamber experiments. The former is sensitive to high energy neutrinos from the self-annihilation of DM particles captured in the Sun, while the latter looks for nuclear recoil events from DM scattering off nucleons. Although slower DM particles are more likely to be captured by the Sun, the faster ones are more likely to be detected by PICO. Recent N-body simulations suggest significant deviations from the SHM for the smooth halo component of the DM, while observations hint at a dominant fraction of the local DM being in substructures. We use the method of Ferrer et al. (JCAP 1509: 052, 2015) to exploit the complementarity between the two approaches and derive conservative constraints on DM-nucleon scattering. Our results constrain σSD≲ 3 × 10 - 39cm 2 (6 × 10 - 38cm 2) at ≳ 90 % C.L. for a DM particle of mass 1 TeV annihilating into τ+τ- (bb¯) with a local density of ρDM=0.3GeV/cm3. The constraints scale inversely with ρDM and are independent of the DM velocity distribution.
Published: 2020

21. Searching for eV-scale sterile neutrinos with eight years of atmospheric neutrinos at the IceCube Neutrino Telescope

Author: Aartsen, MG, Abbasi, R, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Amin, NM, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Basu, V, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desai, A, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Dharani, S, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Fedynitch, A, Felde, J, Fienberg, AT, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, and Gaisser, TK
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, hep-ph, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We report in detail on searches for eV-scale sterile neutrinos, in the context of a 3+1 model, using eight years of data from the IceCube Neutrino Telescope. By analyzing the reconstructed energies and zenith angles of 305,735 atmospheric νμ and ν¯μ events we construct confidence intervals in two analysis spaces: sin2(2θ24) vs Δm412 under the conservative assumption θ34=0; and sin2(2θ24) vs sin2(2θ34) given sufficiently large Δm412 that fast oscillation features are unresolvable. Detailed discussions of the event selection, systematic uncertainties, and fitting procedures are presented. No strong evidence for sterile neutrinos is found, and the best-fit likelihood is consistent with the no sterile neutrino hypothesis with a p value of 8% in the first analysis space and 19% in the second.
Published: 2020

22. IceCube Search for High-energy Neutrino Emission from TeV Pulsar Wind Nebulae

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Balagopal, VA, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Becker Tjus, J, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, BA, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, Delaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: Neutrino astronomy, High energy astrophysics, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: Pulsar wind nebulae (PWNe) are the main gamma-ray emitters in the Galactic plane. They are diffuse nebulae that emit nonthermal radiation. Pulsar winds, relativistic magnetized outflows from the central star, shocked in the ambient medium produce a multiwavelength emission from the radio through gamma-rays. Although the leptonic scenario is able to explain most PWNe emission, a hadronic contribution cannot be excluded. A possible hadronic contribution to the high-energy gamma-ray emission inevitably leads to the production of neutrinos. Using 9.5 yr of all-sky IceCube data, we report results from a stacking analysis to search for neutrino emission from 35 PWNe that are high-energy gamma-ray emitters. In the absence of any significant correlation, we set upper limits on the total neutrino emission from those PWNe and constraints on hadronic spectral components.
Published: 2020

23. Constraints on neutrino emission from nearby galaxies using the 2MASS redshift survey and IceCube

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, V., AB, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Tjus, JB, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Clercq, C, Delaunay, JJ, Dembinski, H, Deoskar, K, Ridder, S, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: neutrino astronomy, neutrino detectors, neutrino experiments, astro-ph.HE, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The distribution of galaxies within the local universe is characterized by anisotropic features. Observatories searching for the production sites of astrophysical neutrinos can take advantage of these features to establish directional correlations between a neutrino dataset and overdensities in the galaxy distribution in the sky. The results of two correlation searches between a seven-year time-integrated neutrino dataset from the IceCube Neutrino Observatory, and the 2MASS Redshift Survey (2MRS) catalog are presented here. The first analysis searches for neutrinos produced via interactions between diffuse intergalactic Ultra-High Energy Cosmic Rays (UHECRs) and the matter contained within galaxies. The second analysis searches for low-luminosity sources within the local universe, which would produce subthreshold multiplets in the IceCube dataset that directionally correlate with galaxy distribution. No significant correlations were observed in either analyses. Constraints are presented on the flux of neutrinos originating within the local universe through diffuse intergalactic UHECR interactions, as well as on the density of standard candle sources of neutrinos at low luminosities.
Published: 2020

24. A search for neutrino point-source populations in 7 yr of icecube data with neutrino-count statistics

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal V., A, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Tjus, JB, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, Delaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: Astrostatistics, Astrostatistics distributions, Bayesian statistics, Neutrino astronomy, High energy astrophysics, Neutrino telescopes, Posterior distribution, astro-ph.HE, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Astronomy & Astrophysics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: The presence of a population of point sources in a data set modifies the underlying neutrino-count statistics from the Poisson distribution. This deviation can be exactly quantified using the non-Poissonian template fitting technique, and in this work we present the first application of this approach to the IceCube high-energy neutrino data set. Using this method, we search in 7 yr of IceCube data for point-source populations correlated with the disk of the Milky Way, the Fermi bubbles, the Schlegel, Finkbeiner, and Davis dust map, or with the isotropic extragalactic sky. No evidence for such a population is found in the data using this technique, and in the absence of a signal, we establish constraints on population models with source-count distribution functions that can be described by a power law with a single break. The derived limits can be interpreted in the context of many possible source classes. In order to enhance the flexibility of the results, we publish the full posterior from our analysis, which can be used to establish limits on specific population models that would contribute to the observed IceCube neutrino flux.
Published: 2020

25. A Search for IceCube Events in the Direction of ANITA Neutrino Candidates

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Arguëlles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal, A, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Tjus, JB, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Clercq, CD, Delaunay, JJ, Dembinski, H, Deoskar, K, Ridder, SD, Desiati, P, Vries, KDD, Wasseige, GD, With, MD, Deyoung, T, Diaz, A, Diáz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: astro-ph.HE, hep-ph, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: During the first three flights of the Antarctic Impulsive Transient Antenna (ANITA) experiment, the collaboration detected several neutrino candidates. Two of these candidate events were consistent with an ultra-high-energy upgoing air shower and compatible with a tau neutrino interpretation. A third neutrino candidate event was detected in a search for Askaryan radiation in the Antarctic ice, although it is also consistent with the background expectation. The inferred emergence angle of the first two events is in tension with IceCube and ANITA limits on isotropic cosmogenic neutrino fluxes. Here we test the hypothesis that these events are astrophysical in origin, possibly caused by a point source in the reconstructed direction. Given that any ultra-high-energy tau neutrino flux traversing the Earth should be accompanied by a secondary flux in the TeV-PeV range, we search for these secondary counterparts in 7 yr of IceCube data using three complementary approaches. In the absence of any significant detection, we set upper limits on the neutrino flux from potential point sources. We compare these limits to ANITA's sensitivity in the same direction and show that an astrophysical explanation of these anomalous events under standard model assumptions is severely constrained regardless of source spectrum.
Published: 2020

26. Search for PeV Gamma-Ray Emission from the Southern Hemisphere with 5 Yr of Data from the IceCube Observatory

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal, AV, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, KH, Becker Tjus, J, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Clercq, CD, Delaunay, JJ, Dembinski, H, Deoskar, K, Ridder, SD, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: The measurement of diffuse PeV gamma-ray emission from the Galactic plane would provide information about the energy spectrum and propagation of Galactic cosmic rays, and the detection of a pointlike source of PeV gamma-rays would be strong evidence for a Galactic source capable of accelerating cosmic rays up to at least a few PeV. This paper presents several unbinned maximum-likelihood searches for PeV gamma-rays in the Southern Hemisphere using 5 yr of data from the IceTop air shower surface detector and the in-ice array of the IceCube Observatory. The combination of both detectors takes advantage of the low muon content and deep shower maximum of gamma-ray air showers and provides excellent sensitivity to gamma-rays between ∼0.6 and 100 PeV. Our measurements of pointlike and diffuse Galactic emission of PeV gamma-rays are consistent with the background, so we constrain the angle-integrated diffuse gamma-ray flux from the Galactic plane at 2 PeV to 2.61 × 10-19 cm-2 s-1 TeV-1 at 90% confidence, assuming an E -3 spectrum, and we estimate 90% upper limits on pointlike emission at 2 PeV between 10-21 and 10-20 cm-2 s-1 TeV-1 for an E -2 spectrum, depending on decl. Furthermore, we exclude unbroken power-law emission up to 2 PeV for several TeV gamma-ray sources observed by the High Energy Spectroscopic System and calculate upper limits on the energy cutoffs of these sources at 90% confidence. We also find no PeV gamma-rays correlated with neutrinos from IceCube's high-energy starting event sample. These are currently the strongest constraints on PeV gamma-ray emission.
Published: 2020

27. Neutrinos below 100 TeV from the southern sky employing refined veto techniques to IceCube data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, Griffith, Z, Günder, M, and Gündüz, M
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Neutrinos, Point sources, Veto techniques, astro-ph.HE, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract: Many Galactic sources of gamma rays, such as supernova remnants, are expected to produce neutrinos with a typical energy cutoff well below 100 TeV. For the IceCube Neutrino Observatory located at the South Pole, the southern sky, containing the inner part of the Galactic plane and the Galactic Center, is a particularly challenging region at these energies, because of the large background of atmospheric muons. In this paper, we present recent advancements in data selection strategies for track-like muon neutrino events with energies below 100 TeV from the southern sky. The strategies utilize the outer detector regions as veto and features of the signal pattern to reduce the background of atmospheric muons to a level which, for the first time, allows IceCube searching for point-like sources of neutrinos in the southern sky at energies between 100 GeV and several TeV in the muon neutrino charged current channel. No significant clustering of neutrinos above background expectation was observed in four years of data recorded with the completed IceCube detector. Upper limits on the neutrino flux for a number of spectral hypotheses are reported for a list of astrophysical objects in the southern hemisphere.
Published: 2020

28. A Search for MeV to TeV Neutrinos from Fast Radio Bursts with IceCube

Author: Beatty, JJ, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, V., AB, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Becker, KH, Becker Tjus, J, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Clercq, CD, Delaunay, JJ, Dembinski, H, Deoskar, K, Ridder, SD, Desiati, P, Vries, KDD, Wasseige, GD, With, MD, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, and Glauch, T
Subjects: astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: We present two searches for IceCube neutrino events coincident with 28 fast radio bursts (FRBs) and 1 repeating FRB. The first improves on a previous IceCube analysis - searching for spatial and temporal correlation of events with FRBs at energies greater than roughly 50 GeV - by increasing the effective area by an order of magnitude. The second is a search for temporal correlation of MeV neutrino events with FRBs. No significant correlation is found in either search; therefore, we set upper limits on the time-integrated neutrino flux emitted by FRBs for a range of emission timescales less than one day. These are the first limits on FRB neutrino emission at the MeV scale, and the limits set at higher energies are an order-of-magnitude improvement over those set by any neutrino telescope.
Published: 2020

29. Combined sensitivity to the neutrino mass ordering with JUNO, the IceCube Upgrade, and PINGU

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Arlen, TC, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Balagopal, A, Barbano, A, Bartos, I, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Bohmer, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, DuVernois, MA, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evans, JJ, Evenson, PA, Fahey, S, Farrag, K, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Fox, D, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, and Gallagher, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, physics.ins-det, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: The ordering of the neutrino mass eigenstates is one of the fundamental open questions in neutrino physics. While current-generation neutrino oscillation experiments are able to produce moderate indications on this ordering, upcoming experiments of the next generation aim to provide conclusive evidence. In this paper we study the combined performance of the two future multi-purpose neutrino oscillation experiments JUNO and the IceCube Upgrade, which employ two very distinct and complementary routes toward the neutrino mass ordering. The approach pursued by the 20 kt medium-baseline reactor neutrino experiment JUNO consists of a careful investigation of the energy spectrum of oscillated νe produced by ten nuclear reactor cores. The IceCube Upgrade, on the other hand, which consists of seven additional densely instrumented strings deployed in the center of IceCube DeepCore, will observe large numbers of atmospheric neutrinos that have undergone oscillations affected by Earth matter. In a joint fit with both approaches, tension occurs between their preferred mass-squared differences Δm312=m32-m12 within the wrong mass ordering. In the case of JUNO and the IceCube Upgrade, this allows to exclude the wrong ordering at >5σ on a timescale of 3-7 years - even under circumstances that are unfavorable to the experiments' individual sensitivities. For PINGU, a 26-string detector array designed as a potential low-energy extension to IceCube, the inverted ordering could be excluded within 1.5 years (3 years for the normal ordering) in a joint analysis.
Published: 2020

30. A Search for MeV to TeV Neutrinos from Fast Radio Bursts with IceCube

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Choi, S, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Astronomical Sciences, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: We present two searches for IceCube neutrino events coincident with 28 fast radio bursts (FRBs) and 1 repeating FRB. The first improves on a previous IceCube analysis - searching for spatial and temporal correlation of events with FRBs at energies greater than roughly 50 GeV - by increasing the effective area by an order of magnitude. The second is a search for temporal correlation of MeV neutrino events with FRBs. No significant correlation is found in either search; therefore, we set upper limits on the time-integrated neutrino flux emitted by FRBs for a range of emission timescales less than one day. These are the first limits on FRB neutrino emission at the MeV scale, and the limits set at higher energies are an order-of-magnitude improvement over those set by any neutrino telescope.
Published: 2020

31. Development of an analysis to probe the neutrino mass ordering with atmospheric neutrinos using three years of IceCube DeepCore data IceCube Collaboration

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Boerner, M, Boeser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, de Andr, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, DeWith, M, DeYoung, T, Diaz, A, Diaz-Velez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evans, JJ, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, Gluesenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: hep-ex, hep-ph, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: The Neutrino Mass Ordering (NMO) remains one of the outstanding questions inthe field of neutrino physics. One strategy to measure the NMO is to observematter effects in the oscillation pattern of atmospheric neutrinos above $\sim1\,\mathrm{GeV}$, as proposed for several next-generation neutrino experiments.Moreover, the existing IceCube DeepCore detector can already explore this typeof measurement. We present rthe development and application of two independentanalyses to search for the signature of the NMO with three years of DeepCoredata. These analyses include a full treatment of systematic uncertainties and astatistically-rigorous method to determine the significance for the NMO from afit to the data. Both analyses show that the dataset is fully compatible withboth mass orderings. For the more sensitive analysis, we observe a preferencefor Normal Ordering with a $p$-value of $p_\mathrm{IO} = 15.3\%$ and$\mathrm{CL}_\mathrm{s}=53.3\%$ for the Inverted Ordering hypothesis, while theexperimental results from both analyses are consistent within theiruncertainties. Since the result is independent of the value of$\delta_\mathrm{CP}$ and obtained from energies $E_u \gtrsim5\,\mathrm{GeV}$, it is complementary to recent results from long-baselineexperiments. These analyses set the groundwork for the future of thismeasurement with more capable detectors, such as the IceCube Upgrade and theproposed PINGU detector.
Published: 2020

32. Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, V., A Balagopal, Barbano, A, Barwick, SW, Bastian, B, Baum, V, Baur, S, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Böttcher, J, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bron, S, Brostean-Kaiser, J, Burgman, A, Buscher, J, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Coleman, A, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Engel, R, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Glauch, T, and Glüsenkamp, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: Low-background searches for astrophysical neutrino sources anywhere in the sky can be performed using cascade events induced by neutrinos of all flavors interacting in IceCube with energies as low as ∼1 TeV. Previously we showed that, even with just two years of data, the resulting sensitivity to sources in the southern sky is competitive with IceCube and ANTARES analyses using muon tracks induced by charge current muon neutrino interactions - especially if the neutrino emission follows a soft energy spectrum or originates from an extended angular region. Here, we extend that work by adding five more years of data, significantly improving the cascade angular resolution, and including tests for point-like or diffuse Galactic emission to which this data set is particularly well suited. For many of the signal candidates considered, this analysis is the most sensitive of any experiment to date. No significant clustering was observed, and thus many of the resulting constraints are the most stringent to date. In this paper we will describe the improvements introduced in this analysis and discuss our results in the context of other recent work in neutrino astronomy.
Published: 2019

33. Investigation of Two Fermi-LAT Gamma-Ray Blazars Coincident with High-energy Neutrinos Detected by IceCube

Author: Collaboration, FL, Collaboration, AS, Collaboration, I, Garrappa, S, Buson, S, Franckowiak, A, Shappee, BJ, Beacom, JF, Dong, S, Holoien, TWS, Kochanek, CS, Prieto, JL, Stanek, KZ, Thompson, TA, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker, KH, Tjus, JB, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, HP, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, De André, JPAM, Clercq, CD, Delaunay, JJ, Dembinski, H, Deoskar, K, Ridder, SD, Desiati, P, Vries, KDD, Wasseige, GD, With, MD, Deyoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Friedman, E, and Fritz, A
Subjects: astro-ph.HE, Astronomical and Space Sciences, Organic Chemistry, Physical Chemistry, Astronomy & Astrophysics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: After the identification of the gamma-ray blazar TXS 0506+056 as the first compelling IceCube neutrino source candidate, we perform a systematic analysis of all high-energy neutrino events satisfying the IceCube realtime trigger criteria. We find one additional known gamma-ray source, the blazar GB6 J1040+0617, in spatial coincidence with a neutrino in this sample. The chance probability of this coincidence is 30% after trial correction. For the first time, we present a systematic study of the gamma-ray flux, spectral and optical variability, and multiwavelength behavior of GB6 J1040+0617 and compare it to TXS 0506+056. We find that TXS 0506+056 shows strong flux variability in the Fermi-Large Area Telescope gamma-ray band, being in an active state around the arrival of IceCube-170922A, but in a low state during the archival IceCube neutrino flare in 2014/15. In both cases the spectral shape is statistically compatible (≤2σ) with the average spectrum showing no indication of a significant relative increase of a high-energy component. While the association of GB6 J1040+0617 with the neutrino is consistent with background expectations, the source appears to be a plausible neutrino source candidate based on its energetics and multiwavelength features, namely a bright optical flare and modestly increased gamma-ray activity. Finding one or two neutrinos originating from gamma-ray blazars in the given sample of high-energy neutrinos is consistent with previously derived limits of neutrino emission from gamma-ray blazars, indicating the sources of the majority of cosmic high-energy neutrinos remain unknown.
Published: 2019

34. Investigation of Two Fermi-LAT Gamma-Ray Blazars Coincident with High-energy Neutrinos Detected by IceCube

Author: Garrappa, S, Buson, S, Franckowiak, A, Shappee, BJ, Beacom, JF, Dong, S, Holoien, TW-S, Kochanek, CS, Prieto, JL, Stanek, KZ, Thompson, TA, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Alispach, C, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Diaz, A, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, and Ganster, E
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: After the identification of the gamma-ray blazar TXS 0506+056 as the first compelling IceCube neutrino source candidate, we perform a systematic analysis of all high-energy neutrino events satisfying the IceCube realtime trigger criteria. We find one additional known gamma-ray source, the blazar GB6 J1040+0617, in spatial coincidence with a neutrino in this sample. The chance probability of this coincidence is 30% after trial correction. For the first time, we present a systematic study of the gamma-ray flux, spectral and optical variability, and multiwavelength behavior of GB6 J1040+0617 and compare it to TXS 0506+056. We find that TXS 0506+056 shows strong flux variability in the Fermi-Large Area Telescope gamma-ray band, being in an active state around the arrival of IceCube-170922A, but in a low state during the archival IceCube neutrino flare in 2014/15. In both cases the spectral shape is statistically compatible (≤2σ) with the average spectrum showing no indication of a significant relative increase of a high-energy component. While the association of GB6 J1040+0617 with the neutrino is consistent with background expectations, the source appears to be a plausible neutrino source candidate based on its energetics and multiwavelength features, namely a bright optical flare and modestly increased gamma-ray activity. Finding one or two neutrinos originating from gamma-ray blazars in the given sample of high-energy neutrinos is consistent with previously derived limits of neutrino emission from gamma-ray blazars, indicating the sources of the majority of cosmic high-energy neutrinos remain unknown.
Published: 2019

35. Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Day, M, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, and Gonzalez, JG
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ph, astro-ph.HE, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for neutrino emission from the blazar TXS 0506+ 056. These results open a new window into the high-energy universe. However, the source or sources of most of the observed flux of astrophysical neutrinos remains uncertain. Here, a search for steady point-like neutrino sources is performed using an unbinned likelihood analysis. The method searches for a spatial accumulation of muon-neutrino events using the very high-statistics sample of about 497,000 neutrinos recorded by IceCube between 2009 and 2017. The median angular resolution is ∼ 1 ∘ at 1 TeV and improves to ∼ 0. 3 ∘ for neutrinos with an energy of 1 PeV. Compared to previous analyses, this search is optimized for point-like neutrino emission with the same flux-characteristics as the observed astrophysical muon-neutrino flux and introduces an improved event-reconstruction and parametrization of the background. The result is an improvement in sensitivity to the muon-neutrino flux compared to the previous analysis of ∼ 35 % assuming an E- 2 spectrum. The sensitivity on the muon-neutrino flux is at a level of E2dN/dE=3·10-13TeVcm-2s-1. No new evidence for neutrino sources is found in a full sky scan and in an a priori candidate source list that is motivated by gamma-ray observations. Furthermore, no significant excesses above background are found from populations of sub-threshold sources. The implications of the non-observation for potential source classes are discussed.
Published: 2019

36. Erratum to: Search for annihilating dark matter in the Sun with 3 years of IceCube data: IceCube Collaboration (The European Physical Journal C, (2017), 77, 3, (146), 10.1140/epjc/s10052-017-4689-9)

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Argüelles, C, Auffenberg, J, Axani, S, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, KH, BenZvi, S, Berley, D, Bernardini, E, Bernhard, A, Besson, DZ, Binder, G, Bindig, D, Bissok, M, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Braun, J, Brayeur, L, Bretz, HP, Bron, S, Burgman, A, Carver, T, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, de André, JPAM, De Clercq, C, del Pino Rosendo, E, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Euler, S, Evenson, PA, Fahey, S, Fazely, AR, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Flis, S, Fösig, CC, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Gladstone, L, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: In the analysis published in 1, constraints on the number of signal events can be interpreted as constraints on the volumetric neutrino to muon conversion rate.
Published: 2019

37. Detection of the Temporal Variation of the Sun's Cosmic Ray Shadow with the IceCube Detector

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, J Becker, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Day, M, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, and Gonzalez, JG
Subjects: Particle and High Energy Physics, Physical Sciences, cosmic rays, ISM: magnetic fields, Moon, Sun: activity, sunspots, astro-ph.HE, astro-ph.SR, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: We report on the observation of a deficit in the cosmic ray flux from the directions of the Moon and Sun with five years of data taken by the IceCube Neutrino Observatory. Between 2010 May and 2011 May the IceCube detector operated with 79 strings deployed in the glacial ice at the South Pole, and with 86 strings between 2011 May and 2015 May. A binned analysis is used to measure the relative deficit and significance of the cosmic ray shadows. Both the cosmic ray Moon and Sun shadows are detected with high statistical significance (>10σ) for each year. The results for the Moon shadow are consistent with previous analyses and verify the stability of the IceCube detector over time. This work represents the first observation of the Sun shadow with the IceCube detector. We show that the cosmic ray shadow of the Sun varies with time. These results make it possible to study cosmic ray transport near the Sun with future data from IceCube.
Published: 2019

38. Measurement of atmospheric tau neutrino appearance with IceCube DeepCore

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker, K-H, Tjus, J Becker, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, Griffith, Z, and Gündüz, M
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We present a measurement of atmospheric tau neutrino appearance from oscillations with three years of data from the DeepCore subarray of the IceCube Neutrino Observatory. This analysis uses atmospheric neutrinos from the full sky with reconstructed energies between 5.6 and 56 GeV to search for a statistical excess of cascadelike neutrino events which are the signature of ντ interactions. For CC+NC (CC-only) interactions, we measure the tau neutrino normalization to be 0.73-0.24+0.30 (0.57-0.30+0.36) and exclude the absence of tau neutrino oscillations at a significance of 3.2σ (2.0σ) These results are consistent with, and of similar precision to, a confirmatory IceCube analysis also presented, as well as measurements performed by other experiments.
Published: 2019

39. All-sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field

Author: Abeysekara, AU, Alfaro, R, Alvarez, C, Arceo, R, Arteaga-Velázquez, JC, Rojas, D Avila, Belmont-Moreno, E, BenZvi, SY, Brisbois, C, Capistrán, T, Carramiana, A, Casanova, S, Cotti, U, Cotzomi, J, Díaz-Vélez, JC, De León, C, De la Fuente, E, Dichiara, S, DuVernois, MA, Espinoza, C, Fiorino, DW, Fleischhack, H, Fraija, N, Galván-Gámez, A, García-González, JA, González, MM, Goodman, JA, Hampel-Arias, Z, Harding, JP, Hernandez, S, Hona, B, Hueyotl-Zahuantitla, F, Iriarte, A, Jardin-Blicq, A, Joshi, V, Lara, A, Vargas, H León, Luis-Raya, G, Malone, K, Marinelli, SS, Martínez-Castro, J, Martinez, O, Matthews, JA, Miranda-Romagnoli, P, Moreno, E, Mostafá, M, Nellen, L, Newbold, M, Nisa, MU, Noriega-Papaqui, R, Pérez-Pérez, EG, Pretz, J, Ren, Z, Rho, CD, Rivière, C, Rosa-González, D, Rosenberg, M, Salazar, H, Greus, F Salesa, Sandoval, A, Schneider, M, Schoorlemmer, H, Sinnis, G, Smith, AJ, Surajbali, P, Taboada, I, Tollefson, K, Torres, I, Villaseor, L, Weisgarber, T, Wood, J, Zepeda, A, Zhou, H, Álvarez, JD, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, J Becker, Becker, K-H, and BenZvi, S
Subjects: Particle and High Energy Physics, Astronomical Sciences, Physical Sciences, astroparticle physics, cosmic rays, ISM: magnetic fields, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: We present the first full-sky analysis of the cosmic ray arrival direction distribution with data collected by the High-Altitude Water Cherenkov and IceCube observatories in the northern and southern hemispheres at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and present a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. From the map, we determine the horizontal dipole components of the anisotropy δ 0h = 9.16 ×10-4 and δ 6h = 7.25 ×10-4 (±0.04 × 10-4). In addition, we infer the direction (229.°2 ± 3.°5 R.A., 11.°4 ± 3.°0 decl.) of the interstellar magnetic field from the boundary between large-scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large-scale anisotropy to be δN ∼ -3.97+1.0-2.0 × 10-4.
Published: 2019

40. All-sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field

Author: Collaboration, H, Collaboration, I, Abeysekara, AU, Alfaro, R, Alvarez, C, Arceo, R, Arteaga-Velázquez, JC, Rojas, DA, Belmont-Moreno, E, Benzvi, SY, Brisbois, C, Capistrán, T, Carramiana, A, Casanova, S, Cotti, U, Cotzomi, J, Diaz-Vélez, JC, De León, C, Fuente, EDL, Dichiara, S, Duvernois, MA, Espinoza, C, Fiorino, DW, Fleischhack, H, Fraija, N, Galván-Gámez, A, Garcia-González, JA, González, MM, Goodman, JA, Hampel-Arias, Z, Harding, JP, Hernandez, S, Hona, B, Hueyotl-Zahuantitla, F, Iriarte, A, Jardin-Blicq, A, Joshi, V, Lara, A, Vargas, HL, Luis-Raya, G, Malone, K, Marinelli, SS, Martinez-Castro, J, Martinez, O, Matthews, JA, Miranda-Romagnoli, P, Moreno, E, Mostafá, M, Nellen, L, Newbold, M, Nisa, MU, Noriega-Papaqui, R, Pérez-Pérez, EG, Pretz, J, Ren, Z, Rho, CD, Riviere, C, Rosa-González, D, Rosenberg, M, Salazar, H, Greus, FS, Sandoval, A, Schneider, M, Schoorlemmer, H, Sinnis, G, Smith, AJ, Surajbali, P, Taboada, I, Tollefson, K, Torres, I, Villaseor, L, Weisgarber, T, Wood, J, Zepeda, A, Zhou, H, Alvarez, JD, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, and Tjus, JB
Subjects: astroparticle physics, cosmic rays, ISM: magnetic fields, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Organic Chemistry, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: We present the first full-sky analysis of the cosmic ray arrival direction distribution with data collected by the High-Altitude Water Cherenkov and IceCube observatories in the northern and southern hemispheres at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and present a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. From the map, we determine the horizontal dipole components of the anisotropy δ 0h = 9.16 ×10 -4 and δ 6h = 7.25 ×10 -4 (±0.04 × 10 -4 ). In addition, we infer the direction (229.°2 ± 3.°5 R.A., 11.°4 ± 3.°0 decl.) of the interstellar magnetic field from the boundary between large-scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large-scale anisotropy to be δN ∼ -3.97 +1.0-2.0 × 10 -4 .
Published: 2019

41. Detection of the Temporal Variation of the Sun's Cosmic Ray Shadow with the IceCube Detector

Author: Collaboration, I, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barbano, A, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, KH, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Bretz, HP, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Chen, C, Cheung, E, Chirkin, D, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Day, M, De André, JPAM, De Clercq, C, Delaunay, JJ, Dembinski, H, Deoskar, K, De Ridder, S, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Díaz-Vélez, JC, Dujmovic, H, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Garrappa, S, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, and Goldschmidt, A
Subjects: cosmic rays, ISM: magnetic fields, Moon, Sun: activity, sunspots, astro-ph.HE, astro-ph.SR, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: We report on the observation of a deficit in the cosmic ray flux from the directions of the Moon and Sun with five years of data taken by the IceCube Neutrino Observatory. Between 2010 May and 2011 May the IceCube detector operated with 79 strings deployed in the glacial ice at the South Pole, and with 86 strings between 2011 May and 2015 May. A binned analysis is used to measure the relative deficit and significance of the cosmic ray shadows. Both the cosmic ray Moon and Sun shadows are detected with high statistical significance (>10σ) for each year. The results for the Moon shadow are consistent with previous analyses and verify the stability of the IceCube detector over time. This work represents the first observation of the Sun shadow with the IceCube detector. We show that the cosmic ray shadow of the Sun varies with time. These results make it possible to study cosmic ray transport near the Sun with future data from IceCube.
Published: 2019

42. Search for neutrinos from decaying dark matter with IceCube

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Samarai, I Al, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Backes, P, Bagherpour, H, Bai, X, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Brenzke, M, Bretz, H-P, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Day, M, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Flis, S, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Ganster, E, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, and Glüsenkamp, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: With the observation of high-energy astrophysical neutrinos by the IceCube Neutrino Observatory, interest has risen in models of PeV-mass decaying dark matter particles to explain the observed flux. We present two dedicated experimental analyses to test this hypothesis. One analysis uses 6 years of IceCube data focusing on muon neutrino 'track' events from the Northern Hemisphere, while the second analysis uses 2 years of 'cascade' events from the full sky. Known background components and the hypothetical flux from unstable dark matter are fitted to the experimental data. Since no significant excess is observed in either analysis, lower limits on the lifetime of dark matter particles are derived: we obtain the strongest constraint to date, excluding lifetimes shorter than 10 28 s at 90% CL for dark matter masses above 10 TeV .
Published: 2018

43. A Search for Neutrino Emission from Fast Radio Bursts with Six Years of IceCube Data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Samarai, IA, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, JB, Becker, KH, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Böser, S, Botner, O, Bourbeau, E, Bourbeau, J, Bradascio, F, Braun, J, Brenzke, M, Bretz, HP, Bron, S, Brostean-Kaiser, J, Burgman, A, Busse, RS, Carver, T, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Collin, GH, Conrad, JM, Coppin, P, Correa, P, Cowen, DF, Cross, R, Dave, P, Day, M, André, JPAMD, De Clercq, C, Delaunay, JJ, Dembinski, H, Ridder, SD, Desiati, P, De Vries, KD, De Wasseige, G, With, MD, Deyoung, T, Díaz-Vélez, JC, Lorenzo, VD, Dujmovic, H, Dumm, JP, Dunkman, M, Dvorak, E, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Flis, S, Franckowiak, A, Friedman, E, Fritz, A, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, and Gonzalez, JG
Subjects: astroparticle physics, cosmic rays, elementary particles, neutrinos, radiation mechanisms: non-thermal, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: We present a search for coincidence between IceCube TeV neutrinos and fast radio bursts (FRBs). During the search period from 2010 May 31 to 2016 May 12, a total of 29 FRBs with 13 unique locations have been detected in the whole sky. An unbinned maximum likelihood method was used to search for spatial and temporal coincidence between neutrinos and FRBs in expanding time windows, in both the northern and southern hemispheres. No significant correlation was found in six years of IceCube data. Therefore, we set upper limits on neutrino fluence emitted by FRBs as a function of time window duration. We set the most stringent limit obtained to date on neutrino fluence from FRBs with an E -2 energy spectrum assumed, which is 0.0021 GeV cm-2 per burst for emission timescales up to ∼102 s from the northern hemisphere stacking search.
Published: 2018

44. Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Samarai, IA, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, JB, Becker, KH, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Bourbeau, J, Bradascio, F, Braun, J, Brayeur, L, Brenzke, M, Bretz, HP, Bron, S, Burgman, A, Carver, T, Casey, J, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, André, JPAMD, Clercq, CD, Delaunay, JJ, Dembinski, H, Ridder, SD, Desiati, P, Vries, KDD, Wasseige, GD, With, MD, Deyoung, T, Daz-Vélez, JC, Lorenzo, VD, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Flis, S, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: gamma rays: ISM, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: The origins of high-energy astrophysical neutrinos remain a mystery despite extensive searches for their sources. We present constraints from seven years of IceCube Neutrino Observatory muon data on the neutrino flux coming from the Galactic plane. This flux is expected from cosmic-ray interactions with the interstellar medium or near localized sources. Two methods were developed to test for a spatially extended flux from the entire plane, both of which are maximum likelihood fits but with different signal and background modeling techniques. We consider three templates for Galactic neutrino emission based primarily on gamma-ray observations and models that cover a wide range of possibilities. Based on these templates and in the benchmark case of an unbroken E-2.5 power-law energy spectrum, we set 90% confidence level upper limits, constraining the possible Galactic contribution to the diffuse neutrino flux to be relatively small, less than 14% of the flux reported in Aartsen et al. above 1 TeV. A stacking method is also used to test catalogs of known high-energy Galactic gamma-ray sources.
Published: 2017

45. Measurement of the νμ energy spectrum with IceCube-79

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Al Samarai, I, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Bradascio, F, Braun, J, Brayeur, L, Bretz, H-P, Bron, S, Burgman, A, Carver, T, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, de André, JPAM, De Clercq, C, del Pino Rosendo, E, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Euler, S, Evenson, PA, Fahey, S, Fazely, AR, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Flis, S, Fösig, C-C, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Gladstone, L, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, and Grant, D
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: IceCube is a neutrino observatory deployed in the glacial ice at the geographic South Pole. The ν μ energy unfolding described in this paper is based on data taken with IceCube in its 79-string configuration. A sample of muon neutrino charged-current interactions with a purity of 99.5% was selected by means of a multivariate classification process based on machine learning. The subsequent unfolding was performed using the software Truee. The resulting spectrum covers an E ν -range of more than four orders of magnitude from 125 GeV to 3.2 PeV. Compared to the Honda atmospheric neutrino flux model, the energy spectrum shows an excess of more than 1.9 σ in four adjacent bins for neutrino energies E ν ≥ 177.8 TeV . The obtained spectrum is fully compatible with previous measurements of the atmospheric neutrino flux and recent IceCube measurements of a flux of high-energy astrophysical neutrinos.
Published: 2017

46. Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Al Samarai, I, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Becker Tjus, J, Becker, KH, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Bourbeau, J, Bradascio, F, Braun, J, Brayeur, L, Brenzke, M, Bretz, HP, Bron, S, Burgman, A, Carver, T, Casey, J, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, De André, JPAM, De Clercq, C, Delaunay, JJ, Dembinski, H, De Ridder, S, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Díaz-Vélez, JC, Di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Flis, S, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, Griffith, Z, and Haack, C
Subjects: astroparticle physics, neutrinos, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5σ. This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations ≲-30.
Published: 2017

47. Search for neutrinos from dark matter self-annihilations in the center of the Milky Way with 3 years of IceCube/DeepCore: IceCube Collaboration

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Al Samarai, I, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Argüelles, C, Auffenberg, J, Axani, S, Bagherpour, H, Bai, X, Barron, JP, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, JB, Becker, KH, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Bourbeau, J, Bradascio, F, Braun, J, Brayeur, L, Brenzke, M, Bretz, HP, Bron, S, Burgman, A, Carver, T, Casey, J, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, de André, JPAM, De Clercq, C, DeLaunay, JJ, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Evenson, PA, Fahey, S, Fazely, AR, Felde, J, Filimonov, K, Finley, C, Flis, S, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: hep-ex, Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: We present a search for a neutrino signal from dark matter self-annihilations in the Milky Way using the IceCube Neutrino Observatory (IceCube). In 1005 days of data we found no significant excess of neutrinos over the background of neutrinos produced in atmospheric air showers from cosmic ray interactions. We derive upper limits on the velocity averaged product of the dark matter self-annihilation cross section and the relative velocity of the dark matter particles ⟨ σAv⟩. Upper limits are set for dark matter particle candidate masses ranging from 10 GeV up to 1 TeV while considering annihilation through multiple channels. This work sets the most stringent limit on a neutrino signal from dark matter with mass between 10 and 100 GeV, with a limit of 1.18·10-23cm3s-1 for 100 GeV dark matter particles self-annihilating via τ+τ- to neutrinos (assuming the Navarro–Frenk–White dark matter halo profile).
Published: 2017

48. Extending the Search for Muon Neutrinos Coincident with Gamma-Ray Bursts in IceCube Data

Author: Collaboration, I, Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Samarai, IA, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Argüelles, C, Auffenberg, J, Axani, S, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, JB, Becker, KH, Benzvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Braun, J, Brayeur, L, Bretz, HP, Bron, S, Burgman, A, Carver, T, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, De André, JPAM, De Clercq, C, Del Pino Rosendo, E, Dembinski, H, Ridder, SD, Desiati, P, De Vries, KD, De Wasseige, G, De With, M, Deyoung, T, Díaz-Vélez, JC, Lorenzo, VD, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Euler, S, Evenson, PA, Fahey, S, Fazely, AR, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Flis, S, Fösig, CC, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Gladstone, L, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: acceleration of particles, astroparticle physics, gamma-ray burst: general, neutrinos, astro-ph.HE, Astronomy & Astrophysics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract: We present an all-sky search for muon neutrinos produced during the prompt γ-ray emission of 1172 gamma-ray bursts (GRBs) with the IceCube Neutrino Observatory. The detection of these neutrinos would constitute evidence for ultra-high-energy cosmic-ray (UHECR) production in GRBs, as interactions between accelerated protons and the prompt γ-ray field would yield charged pions, which decay to neutrinos. A previously reported search for muon neutrino tracks from northern hemisphere GRBs has been extended to include three additional years of IceCube data. A search for such tracks from southern hemisphere GRBs in five years of IceCube data has been introduced to enhance our sensitivity to the highest energy neutrinos. No significant correlation between neutrino events and observed GRBs is seen in the new data. Combining this result with previous muon neutrino track searches and a search for cascade signature events from all neutrino flavors, we obtain new constraints for single-zone fireball models of GRB neutrino and UHECR production.
Published: 2017

49. Extending the Search for Muon Neutrinos Coincident with Gamma-Ray Bursts in IceCube Data

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Al Samarai, I, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Argüelles, C, Auffenberg, J, Axani, S, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, J Becker, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Besson, DZ, Binder, G, Bindig, D, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Braun, J, Brayeur, L, Bretz, H-P, Bron, S, Burgman, A, Carver, T, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, de André, JPAM, De Clercq, C, del Pino Rosendo, E, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Euler, S, Evenson, PA, Fahey, S, Fazely, AR, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Flis, S, Fösig, C-C, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Gladstone, L, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, Griffith, Z, and Haack, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, acceleration of particles, astroparticle physics, gamma-ray burst: general, neutrinos, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract: We present an all-sky search for muon neutrinos produced during the prompt γ-ray emission of 1172 gamma-ray bursts (GRBs) with the IceCube Neutrino Observatory. The detection of these neutrinos would constitute evidence for ultra-high-energy cosmic-ray (UHECR) production in GRBs, as interactions between accelerated protons and the prompt γ-ray field would yield charged pions, which decay to neutrinos. A previously reported search for muon neutrino tracks from northern hemisphere GRBs has been extended to include three additional years of IceCube data. A search for such tracks from southern hemisphere GRBs in five years of IceCube data has been introduced to enhance our sensitivity to the highest energy neutrinos. No significant correlation between neutrino events and observed GRBs is seen in the new data. Combining this result with previous muon neutrino track searches and a search for cascade signature events from all neutrino flavors, we obtain new constraints for single-zone fireball models of GRB neutrino and UHECR production.
Published: 2017

50. The IceCube realtime alert system

Author: Aartsen, MG, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Andeen, K, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Argüelles, C, Auffenberg, J, Axani, S, Bai, X, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, J Becker, Becker, K-H, BenZvi, S, Berley, D, Bernardini, E, Bernhard, A, Besson, DZ, Binder, G, Bindig, D, Bissok, M, Blaufuss, E, Blot, S, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Braun, J, Brayeur, L, Bretz, H-P, Bron, S, Burgman, A, Carver, T, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Cross, R, Day, M, de André, JPAM, De Clercq, C, del Pino Rosendo, E, Dembinski, H, De Ridder, S, Desiati, P, de Vries, KD, de Wasseige, G, de With, M, DeYoung, T, Díaz-Vélez, JC, di Lorenzo, V, Dujmovic, H, Dumm, JP, Dunkman, M, Eberhardt, B, Ehrhardt, T, Eichmann, B, Eller, P, Euler, S, Evenson, PA, Fahey, S, Fazely, AR, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Flis, S, Fösig, C-C, Franckowiak, A, Friedman, E, Fuchs, T, Gaisser, TK, Gallagher, J, Gerhardt, L, Ghorbani, K, Giang, W, Gladstone, L, Glauch, T, Glüsenkamp, T, Goldschmidt, A, Gonzalez, JG, Grant, D, and Griffith, Z
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Neutrino astronomy, Neutrino detectors, Transient sources, Multi-messenger astronomy, astro-ph.HE, astro-ph.IM, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract: Although high-energy astrophysical neutrinos were discovered in 2013, their origin is still unknown. Aiming for the identification of an electromagnetic counterpart of a rapidly fading source, we have implemented a realtime analysis framework for the IceCube neutrino observatory. Several analyses selecting neutrinos of astrophysical origin are now operating in realtime at the detector site in Antarctica and are producing alerts for the community to enable rapid follow-up observations. The goal of these observations is to locate the astrophysical objects responsible for these neutrino signals. This paper highlights the infrastructure in place both at the South Pole site and at IceCube facilities in the north that have enabled this fast follow-up program to be implemented. Additionally, this paper presents the first realtime analyses to be activated within this framework, highlights their sensitivities to astrophysical neutrinos and background event rates, and presents an outlook for future discoveries.
Published: 2017

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