scholarly journals Conflict between the identification of a cosmic neutrino source and the sensitivity to mixing angles in a neutrino telescope

2008 ◽  
Vol 78 (9) ◽  
Author(s):  
Ggyoung-Riun Hwang ◽  
Kim Siyeon
Keyword(s):  
Neutrino Telescope ◽  
Mixing Angles ◽  
Neutrino Source ◽  
Cosmic Neutrino

scholarly journals Recent Results from the Antares Neutrino Telescope

2019 ◽  
Vol 207 ◽  
pp. 01001
Author(s):  
Antoine Kouchner
Keyword(s):  
Galactic Plane ◽  
Large Fraction ◽  
Neutrino Flux ◽  
High Energy ◽  
Neutrino Telescope ◽  
Point Sources ◽  
Joint Analysis ◽  
Neutrino Source ◽  
Cosmic Neutrino ◽  
The One

Antares, the first undersea neutrino telescope, has been continuously operating since 2007 in the Mediterranean Sea. The transparency of the water allows for a very good angular resolution in the reconstruction of neutrino events of all flavors. This results in an unmatched sensitivity for neutrino source searches, in a large fraction of the Southern Sky, at TeV energies. As a consequence, Antares provides valuable constraints on the origin of the cosmic neutrino flux discovered by the IceCube Collaboration. Based on an all-flavor dataset spanning nine years of operation of the detector, the latest results of Antares searches for neutrino point sources, and for diffuse neutrino emission from the entire sky as well as from several interesting regions such as the Galactic Plane, are presented. Several results have been obtained through a joint analysis with the IceCube Collaboration. Concerning the multi-messenger program, the focus is made on the follow-up searches of IceCube alerts, in particular the one related to the TXS 0506+056 blazar, thought to be the first extragalactic high-energy neutrino source identified so far.

scholarly journals SEARCH FOR NEUTRINO EMISSION FROM GAMMA-RAY SOURCES WITH THE ANTARES TELESCOPE

2012 ◽  
Vol 08 ◽  
pp. 307-310
Author(s):  
C. BIGONGIARI
Keyword(s):  
Gamma Ray ◽  
Neutrino Flux ◽  
Three Dimensional ◽  
Effective Area ◽  
High Energy ◽  
Neutrino Telescope ◽  
Neutrino Detector ◽  
Upper Limits ◽  
Cosmic Neutrino ◽  
Promising Source

ANTARES is the first undersea neutrino detector ever built and presently the neutrino telescope with the largest effective area operating in the Northern Hemisphere. A three-dimensional array of photomultiplier tubes detects the Cherenkov light induced by the muons produced in the interaction of high energy neutrinos with the matter surrounding the detector. The detection of astronomical neutrino sources is one of the main goals of ANTARES. The search for point-like neutrino sources with the ANTARES telescope is described and the preliminary results obtained with data collected from 2007 to 2010 are shown. No cosmic neutrino source has been observed and neutrino flux upper limits have been calculated for the most promising source candidates.

scholarly journals IceCube Sterile Neutrino Searches

2019 ◽  
Vol 207 ◽  
pp. 04005 ◽  
Author(s):  
B. J. P. Jones
Keyword(s):  
Large Volume ◽  
Sterile Neutrino ◽  
Large Mass ◽  
Neutrino Telescope ◽  
Muon Neutrino ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Mixing Angles ◽  
Neutrino Telescopes ◽  
Ongoing Work

Anomalies in short baseline experiments have been interpreted as evidence for additional neutrino mass states with large mass splittings from the known, active flavors. This explanation mandates a corresponding signature in the muon neutrino disappearance channel, which has yet to be observed. Searches for muon neutrino disappearance at the IceCube neutrino telescope presently provide the strongest limits in the space of mixing angles for eVscale sterile neutrinos. This proceeding for the Very Large Volume Neutrino Telescopes (VLVnT) Workshop summarizes the IceCube analyses that have searched for sterile neutrinos and describes ongoing work toward enhanced, high-statistics sterile neutrino searches.

scholarly journals Latest results on high-energy cosmic neutrino searches with the ANTARES neutrino telescope

2019 ◽  
Vol 210 ◽  
pp. 03004
Author(s):  
Agustín Sánchez Losa
Keyword(s):  
Galactic Center ◽  
Galactic Plane ◽  
Cosmic Ray ◽  
High Energy ◽  
Neutrino Telescope ◽  
Southern Coast ◽  
Transient Phenomena ◽  
Neutrino Production ◽  
Cosmic Neutrino ◽  
Extended Sources

The ANTARES detector is currently the largest undersea neutrino telescope. Located in the Mediterranean Sea at a depth of 2.5 km, 40 km off the Southern coast of France, it has been looking for cosmic neutrinos for more than 10 years. High-energy cosmic neutrino production is strongly linked with cosmic ray production. The latest results from IceCube Collaboration represent a step forward towards the confirmation of a highenergy cosmic ray source. The ANTARES location in the Northern Hemisphere is optimal for the observation of most of the Galactic Plane, including the Galactic Center. It has constrained the IceCube neutrino excess reports as well as, more recently, the flux from the source identified in the Blazar TXS 0506+056. The latest results of ANTARES on such analyses, including point-like and extended sources, diffuse fluxes, transient phenomena and multi-messenger studies, are presented.

scholarly journals Dissecting the region around IceCube-170922A: the blazar TXS 0506+056 as the first cosmic neutrino source

2019 ◽  
Vol 207 ◽  
pp. 02003
Author(s):  
Theo Glauch ◽  
Paolo Padovani ◽  
Paolo Giommi ◽  
Elisa Resconi ◽  
Bruno Arsioli ◽  
...  
Keyword(s):  
Arrival Time ◽  
Archival Data ◽  
High Flux ◽  
Neutrino Source ◽  
Multi Wavelength ◽  
Cosmic Neutrino ◽  
Hard Spectrum ◽  
Soft Spectrum ◽  
Γ Ray

On MJD 58018 the IceCube neutrino observatory detected a highlyenergetic, well-reconstructed neutrino, IceCube-170922A, at a distance of 0:1° to a γ-ray flaring blazar, TXS 0506+056. Follow-up searches in archival data additionally revealed a larger flare of neutrinos from the same direction. In order to complete the picture we present here a full multi-wavelength study of the region around IceCube-170922A. While we identify also other non-thermal counterpart candidates, we show that all the evidence points to TXS 0506+056 as the dominant neutrino emitter. Additionally, an analysis of all the available Fermi-LAT data indicates a hard spectrum/low flux of TXS 0506+056 during the neutrino flare in contrast to a soft spectrum/high flux at the arrival time of IceCube-170922A. Putting all the pieces together we conclude that the SED of TXS 0506+056 can be energetically reconnected for both neutrino observations.

scholarly journals The Antares And Km3Net Neutrino Telescopes: Status And Outlook For Acoustic Studies

2019 ◽  
Vol 216 ◽  
pp. 01004
Author(s):  
Véronique Van Elewyck
Keyword(s):  
Atmospheric Neutrino ◽  
Neutrino Flux ◽  
High Energy ◽  
Neutrino Telescope ◽  
Mass Hierarchy ◽  
Neutrino Mass Hierarchy ◽  
Neutrino Telescopes ◽  
Cosmic Neutrino ◽  
Under Construction

The ANTARES detector has been operating continuously since 2007 in the Mediterranean Sea, demonstrating the feasibility of an undersea neutrino telescope. Its superior angular resolution in the reconstruction of neutrino events of all flavors results in unprecedented sensitivity for neutrino source searches in the southern sky at TeV energies, so that valuable constraints can be set on the origin of the cosmic neutrino flux discovered by theIceCube detector. The next generation KM3NeT neutrino telescope is now under construction, featuring two detectors with the same technology but different granularity: ARCA designed to search for high energy (TeV-PeV) cosmic neutrinos and ORCA designed to study atmospheric neutrino oscillations at the GeV scale, focusing on the determination of the neutrino mass hierarchy. Both detectors use acoustic devices for positioning calibration, and provide testbeds for acoustic neutrino detection.

scholarly journals Flavour Composition and Entropy Increase of Cosmological Neutrinos After Decoherence

Universe ◽  
2019 ◽  
Vol 5 (10) ◽  
pp. 203
Author(s):  
Daniel Boriero ◽  
Dominik J. Schwarz ◽  
Hermano Velten
Keyword(s):  
Cp Violation ◽  
Space Time ◽  
Mixing Angles ◽  
Entropy Increase ◽  
Cosmic Neutrino Background ◽  
Cosmic Neutrino ◽  
Charge Parity ◽  
Cosmological Neutrinos ◽  
Neutrino Background ◽  
Time Lead

We propose that gravitational interactions of cosmic neutrinos with the statistically homogeneous and isotropic fluctuations of space-time lead to decoherence. This working hypothesis, which we describe by means of a Lindblad operator, is applied to the system of two- and three-flavour neutrinos undergoing vacuum oscillations and the consequences are investigated. As a result of this decoherence we find that the neutrino entropy would increase as a function of initial spectral distortions, mixing angles and charge-parity (CP)-violation phase. Subsequently we discuss the chances to discover such an increase observationally (in principle). We also present the expected flavour composition of the cosmic neutrino background after decoherence is completed. The physics of two- or three-flavour oscillation of cosmological neutrinos resembles in many aspects two- or three-level systems in atomic clocks, which were recently proposed by Weinberg for the study of decoherence phenomena.

scholarly journals TXS 0506+056, the first cosmic neutrino source, is not a BL Lac

2019 ◽  
Vol 484 (1) ◽  
pp. L104-L108 ◽  
Author(s):  
P Padovani ◽  
F Oikonomou ◽  
M Petropoulou ◽  
P Giommi ◽  
E Resconi
Keyword(s):  
Neutrino Source ◽  
Bl Lac ◽  
Cosmic Neutrino

scholarly journals Dissecting the region around IceCube-170922A: the blazar TXS 0506+056 as the first cosmic neutrino source

2018 ◽  
Vol 480 (1) ◽  
pp. 192-203 ◽  
Author(s):  
P Padovani ◽  
P Giommi ◽  
E Resconi ◽  
T Glauch ◽  
B Arsioli ◽  
...  
Keyword(s):  
Neutrino Source ◽  
Cosmic Neutrino

scholarly journals Deconvolution in Measurements of Muon Neutrino Energy Spectra with IceCube

2019 ◽  
Vol 207 ◽  
pp. 05006
Author(s):  
Tim Ruhe
Keyword(s):  
Neutrino Energy ◽  
Neutrino Telescope ◽  
Muon Neutrino ◽  
Energy Spectra ◽  
Spectral Measurements ◽  
Energy Dependent

As the energy of an incident neutrino cannot be accessed experimentally, muon neutrino energy spectra have to be inferred from energy-dependent observables, using deconvolution algorithms. This paper discusses the challenges associated with the application of deconvolution algorithms and presents two examples of spectral measurements obtained using the IceCube neutrino telescope in the 59- and 79-string configuration.

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