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Search Results: 1 - 10 of 219599 matches for " C.;Kouchner "
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High-energy neutrino astronomy
A. Kouchner
Astrophysics and Space Sciences Transactions (ASTRA) , 2011, DOI: 10.5194/astra-7-35-2011
Abstract: Neutrinos constitute a unique probe since they escape from their sources, travel undisturbed on cosmological distances and are produced in high-energy (HE) hadronic processes. In particular they would allow a direct detection and unambiguous identification of the acceleration sites of HE baryonic cosmic rays (CR), which remain unknown. The latest results achieved with the current experiments are briefly reviewed, including the efforts towards a multi-messenger approach.
ANTARES and other Neutrino Telescopes in the Northern Hemisphere
Antoine Kouchner
Physics , 2009, DOI: 10.1016/j.nuclphysbps.2009.09.052
Abstract: Several projects are concentrating their efforts on opening the high energy neutrino window on the Universe with km-scale detectors. The detection principle relies on the observation, using photomultipliers, of the Cherenkov light emitted by charged leptons induced by neutrino interactions in the surrounding detector medium. In the Northern hemisphere, while the pioneering Baikal telescope, has been operating for 10 years, most of the activity now concentrates in the Mediterranean sea. Recently, the Antares collaboration has completed the construction of a 12 line array comprising ~ 900 photomultipliers. In this paper we will review the main results achieved with the detectors currently in operation in the Northern hemisphere, as well as the R&D efforts towards the construction of a large volume neutrino telescope in the Mediterranean.
Mass hierarchy discrimination with atmospheric neutrinos in large volume ice/water Cherenkov detectors
Franco, D.;Jollet, C.;Kouchner, A.;Kulikovskiy, V.;Meregaglia, A.;Perasso, S.;Pradier, T.;Tonazzo, A.;Van Elewyck, V.
High Energy Physics - Phenomenology , 2013,
Abstract: Large mass ice/water Cherenkov experiments, optimized to detect low energy (1-20 GeV) atmospheric neutrinos, have the potential to discriminate between normal and inverted neutrino mass hierarchies. The sensitivity depends on several model and detector parameters, such as the neutrino flux profile and normalization, the Earth density profile, the oscillation parameter uncertainties, and the detector effective mass and resolution. A proper evaluation of the mass hierarchy discrimination power requires a robust statistical approach. In this work, the Toy Monte Carlo, based on an extended unbinned likelihood ratio test statistic, was used. The effect of each model and detector parameter, as well as the required detector exposure, was then studied. While uncertainties on the Earth density and atmospheric neutrino flux profiles were found to have a minor impact on the mass hierarchy discrimination, the flux normalization, as well as some of the oscillation parameter (\Delta m^2_{31}, \theta_{13}, \theta_{23}, and \delta_{CP}) uncertainties and correlations resulted critical. Finally, the minimum required detector exposure, the optimization of the low energy threshold, and the detector resolutions were also investigated.
Mass hierarchy discrimination with atmospheric neutrinos in large volume ice/water Cherenkov detectors
D. Franco,C. Jollet,A. Kouchner,V. Kulikovskiy,A. Meregaglia,S. Perasso,T. Pradier,A. Tonazzo,V. Van Elewyck
Physics , 2013, DOI: 10.1007/JHEP04(2013)008
Abstract: Large mass ice/water Cherenkov experiments, optimized to detect low energy (1-20 GeV) atmospheric neutrinos, have the potential to discriminate between normal and inverted neutrino mass hierarchies. The sensitivity depends on several model and detector parameters, such as the neutrino flux profile and normalization, the Earth density profile, the oscillation parameter uncertainties, and the detector effective mass and resolution. A proper evaluation of the mass hierarchy discrimination power requires a robust statistical approach. In this work, the Toy Monte Carlo, based on an extended unbinned likelihood ratio test statistic, was used. The effect of each model and detector parameter, as well as the required detector exposure, was then studied. While uncertainties on the Earth density and atmospheric neutrino flux profiles were found to have a minor impact on the mass hierarchy discrimination, the flux normalization, as well as some of the oscillation parameter (\Delta m^2_{31}, \theta_{13}, \theta_{23}, and \delta_{CP}) uncertainties and correlations resulted critical. Finally, the minimum required detector exposure, the optimization of the low energy threshold, and the detector resolutions were also investigated.
Measurement of atmospheric neutrino oscillations with very large volume neutrino telescopes
J. P. Ya?ez,A. Kouchner
Physics , 2015,
Abstract: Neutrino oscillations have been probed during the last few decades using multiple neutrino sources and experimental set-ups. In the recent years, very large volume neutrino telescopes have started contributing to the field. First ANTARES and then IceCube have relied on large and sparsely instrumented volumes to observe atmospheric neutrinos for combinations of baselines and energies inaccessible to other experiments. Using this advantage, the latest result from IceCube starts approaching the precision of other established technologies, and is paving the way for future detectors, such as ORCA and PINGU. These new projects seek to provide better measurements of neutrino oscillation parameters, and eventually determine the neutrino mass ordering. The results from running experiments and the potential from proposed projects are discussed in this review, emphasizing the experimental challenges involved in the measurements.
Joint searches between gravitational-wave interferometers and high-energy neutrino telescopes: science reach and analysis strategies
V. Van Elewyck,S. Ando,Y. Aso,B. Baret,M. Barsuglia,I. Bartos,E. Chassande-Mottin,I. Di Palma,J. Dwyer,C. Finley,K. Kotake,A. Kouchner,S. Marka,Z. Marka,J. Rollins,C. D. Ott,T. Pradier,A. Searle
Physics , 2009, DOI: 10.1142/S0218271809015655
Abstract: Many of the astrophysical sources and violent phenomena observed in our Universe are potential emitters of gravitational waves (GWs) and high-energy neutrinos (HENs). A network of GW detectors such as LIGO and Virgo can determine the direction/time of GW bursts while the IceCube and ANTARES neutrino telescopes can also provide accurate directional information for HEN events. Requiring the consistency between both, totally independent, detection channels shall enable new searches for cosmic events arriving from potential common sources, of which many extra-galactic objects.
Multimessenger astronomy with gravitational waves and high-energy neutrinos
S. Ando,B. Baret,B. Bouhou,E. Chassande-Mottin,A. Kouchner,L. Moscoso,V. Van Elewyck,I. Bartos,S. Márka,Z. Márka,A. Corsi,I. Di Palma,M. A. Papa,A. Dietz,C. Donzaud,D. Eichler,C. Finley,D. Guetta,F. Halzen,G. Jones,P. J. Sutton,S. Kandhasamy,V. Mandic,E. Thrane,K. Kotake,T. Piran,T. Pradier,G. E. Romero,E. Waxman
Physics , 2012, DOI: 10.1103/RevModPhys.85.1401
Abstract: Many of the astrophysical sources and violent phenomena observed in our Universe are potential emitters of gravitational waves (GW) and high-energy neutrinos (HEN). Both GWs and HENs may escape very dense media and travel unaffected over cosmological distances, carrying information from the innermost regions of the astrophysical engines. Such messengers could also reveal new, hidden sources that have not been observed by conventional photon-based astronomy. Coincident observation of GWs and HENs may thus play a critical role in multimessenger astronomy. This is particularly true at the present time owing to the advent of a new generation of dedicated detectors: IceCube, ANTARES, VIRGO and LIGO. Given the complexity of the instruments, a successful joint analysis of this data set will be possible only if the expertise and knowledge of the data is shared between the two communities. This review aims at providing an overview of both theoretical and experimental state-of-the-art and perspectives for such a GW+HEN multimessenger astronomy.
A Fast Algorithm for Muon Track Reconstruction and its Application to the ANTARES Neutrino Telescope
ANTARES collaboration,J. A. Aguilar,I. Al Samarai,A. Albert,M. Andre,M. Anghinolfi,G. Anton,S. Anvar,M. Ardid,A. C. Assis Jesus,T. Astraatmadja,J-J. Aubert,R. Auer,B. Baret,S. Basa,M. Bazzotti,V. Bertin,S. Biagi,C. Bigongiari,C. Bogazzi,M. Bou-Cabo,M. C. Bouwhuis,A. M. Brown,J. Brunner,J. Busto,F. Camarena,A. Capone,C. Carloganu,G. Carminati,J. Carr,S. Cecchini,Ph. Charvis,T. Chiarusi,M. Circella,R. Coniglione,H. Costantini,N. Cottini,P. Coyle,C. Curtil,M. P. Decowski,I. Dekeyser,A. Deschamps,C. Distefano,C. Donzaud,D. Dornic,Q. Dorosti,D. Drouhin,T. Eberl,U. Emanuele,J-P. Ernenwein,S. Escoffier,F. Fehr,V. Flaminio,U. Fritsch,J-L. Fuda,S. Galata,P. Gay,G. Giacomelli,J. P. Gomez-Gonzalez,K. Graf,G. Guillard,G. Halladjian,G. Hallewell,H. van Haren,A. J. Heijboer,Y. Hello,J. J. Hernandez-Rey,B. Herold,J. H??l,C. C. Hsu,M. de Jong,M. Kadler,N. Kalantar-Nayestanaki,O. Kalekin,A. Kappes,U. Katz,P. Kooijman,C. Kopper,A. Kouchner,V. Kulikovskiy,R. Lahmann,P. Lamare,G. Larosa,D. Lefevre,G. Lim,D. Lo Presti,H. Loehner,S. Loucatos,F. Lucarelli,S. Mangano,M. Marcelin,A. Margiotta,J. A. Martinez-Mora,A. Mazure,A. Meli,T. Montaruli,M. Morganti,L. Moscoso,H. Motz,C. Naumann,M. Neff,D. Palioselitis,G. E. Pavalas,P. Payre,J. Petrovic,N. Picot-Clemente,C. Picq,V. Popa,T. Pradier,E. Presani,C. Racca,C. Reed,G. Riccobene,C. Richardt,R. Richter,A. Rostovtsev,M. Rujoiu,G. V. Russo,F. Salesa,P. Sapienza,F. Sch?ck,J-P. Schuller,R. Shanidze,F. Simeone,A. Spiess,M. Spurio,J. J. M. Steijger
Physics , 2011, DOI: 10.1016/j.astropartphys.2011.01.003
Abstract: An algorithm is presented, that provides a fast and robust reconstruction of neutrino induced upward-going muons and a discrimination of these events from downward-going atmospheric muon background in data collected by the ANTARES neutrino telescope. The algorithm consists of a hit merging and hit selection procedure followed by fitting steps for a track hypothesis and a point-like light source. It is particularly well-suited for real time applications such as online monitoring and fast triggering of optical follow-up observations for multi-messenger studies. The performance of the algorithm is evaluated with Monte Carlo simulations and various distributions are compared with that obtained in ANTARES data.
Time Calibration of the ANTARES Neutrino Telescope
The ANTARES Collaboration,J. A. Aguilar,I. Al Samarai,A. Albert,M. André,M. Anghinolfi,G. Anton,S. Anvar,M. Ardid,A. C. Assis Jesus,T. Astraatmadja,J. J. Aubert,R. Auer,B. Baret,S. Basa,M. Bazzotti,V. Bertin,S. Biagi,C. Bigongiari,M. Bou-Cabo,M. C. Bouwhuis,A. M. Brown,J. Brunner,J. Busto,F. Camarena,A. Capone,C. Carloganu,G. Carminati,J. Carr,S. Cecchini,Ph. Charvis,T. Chiarusi,M. Circella,H. Costantini,N. Cottini,P. Coyle,C. Curtil,M. P. Decowski,I. Dekeyser,A. Deschamps,C. Distefano,C. Donzaud,D. Dornic,D. Drouhin,T. Eberl,U. Emanuele,J. P. Ernenwein,S. Escoffier,F. Fehr,V. Flaminio,U. Fritsch,J. L. Fuda,S. Galata,P. Gay,G. Giacomelli,J. P. Gómez-González,K. Graf,G. Guillard,G. Halladjian,G. Hallewell,H. van Haren,A. J. Heijboer,Y. Hello,J. J. Hernández-Rey,B. Herold,J. H?ssl,C. C. Hsu,M. de Jong,M. Kadler,N. Kalantar-Nayestanaki,O. Kalekin,A. Kappes,U. Katz,P. Kooijman,C. Kopper,A. Kouchner,V. Kulikovskiy,R. Lahmann,P. Lamare,G. Larosa,D. Lefèvre,G. Lim,D. Lo Presti,H. Loehner,S. Loucatos,F. Lucarelli,S. Mangano,M. Marcelin,A. Margiotta,J. A. Martinez-Mora,A. Mazure,T. Montaruli,M. Morganti,L. Moscoso,H. Motz,C. Naumann,M. Neff,D. Palioselitis,G. E. Pavalas,P. Payre,J. Petrovic,P. Piattelli,N. Picot-Clemente,C. Picq,V. Popa,T. Pradier,E. Presani,C. Racca,C. Reed,G. Riccobene,C. Richardt,M. Rujoiu,G. V. Russo,F. Salesa,P. Sapienza,F. Sch?ck,J. P. Schuller,R. Shanidze,F. Simeone,A. Spies,M. Spurio,J. J. M. Steijger,Th. Stolarczyk,M. Taiuti,C. Tamburini,L. Tasca,S. Toscano
Physics , 2010, DOI: 10.1016/j.astropartphys.2010.12.004
Abstract: The ANTARES deep-sea neutrino telescope comprises a three-dimensional array of photomultipliers to detect the Cherenkov light induced by upgoing relativistic charged particles originating from neutrino interactions in the vicinity of the detector. The large scattering length of light in the deep sea facilitates an angular resolution of a few tenths of a degree for neutrino energies exceeding 10 TeV. In order to achieve this optimal performance, the time calibration procedures should ensure a relative time calibration between the photomultipliers at the level of about 1ns. The methods developed to attain this level of precision are described.
A method for detection of muon induced electromagnetic showers with the ANTARES detector
J. A. Aguilar,I. Al. Samarai,A. Albert,M. André,M. Anghinolfi,G. Anton,S. Anvar,M. Ardid,A. C. Assis Jesus,T. Astraatmadja,J. J. Aubert,B. Baret,S. Basa,V. Bertin,S. Biagi,A. Bigi,C. Bigongiari,C. Bogazzi,M. Bou-Cabo,B. Bouhou,M. C. Bouwhuis,J. Brunner,J. Busto,F. Camarena,A. Capone,C. Carloganu,G. Carminati,J. Carr,S. Cecchini,Z. Charif,P. Charvis,T. Chiarusi,M. Circella,R. Coniglione,H. Costantini,P. Coyle,C. Curtil,M. P. Decowski,I. Dekeyser,A. Deschamps,C. Distefano,C. Donzaud,D. Dornic,Q. Dorosti,D. Drouhin,T. Eberl,U. Emanuele,A. Enzenh?fer,J. P. Ernenwein,S. Escoffier,P. Fermani,M. Ferri,V. Flaminio,F. Folger,U. Fritsch,J. L. Fuda,S. Galatà,P. Gay,G. Giacomelli,V. Giordano,J. P. Gómez-González,K. Graf,G. Guillard,G. Halladjian,G. Hallewell,H. van Haren,J. Hartman,A. J. Heijboer,Y. Hello,J. J. Hernández-Rey,B. Herold,J. H?\ssl,C. C. Hsu,M. de Jong,M. Kadler,O. Kalekin,A. Kappes,U. Katz,O. Kavatsyuk,P. Kooijman,C. Kopper,A. Kouchner,I. Kreykenbohm,V. Kulikovskiy,R. Lahmann,P. Lamare,G. Larosa,D. Lattuada,D. Lefèvre,G. Lim,D. Lo Presti,H. Loehner,S. Loucatos,S. Mangano,M. Marcelin,A. Margiotta,J. A. Martinez-Mora,A. Meli,T. Montaruli,L. Moscoso,H. Motz,M. Neff,E. Nezri,D. Palioselitis,G. E. P\uav\uala\cs,K. Payet,P. Payre,J. Petrovic,P. Piattelli,N. Picot-Clemente,V. Popa,T. Pradier,E. Presani,C. Racca,C. Reed,C. Richardt,R. Richter,C. Rivière,A. Robert,K. Roensch,A. Rostovtsev,J. Ruiz-Rivas,M. Rujoiu,G. V. Russo,F. Salesa,P. Sapienza,F. Sch?ck,J. P. Schuller
Physics , 2011, DOI: 10.1016/j.nima.2012.01.060
Abstract: The primary aim of ANTARES is neutrino astronomy with upward going muons created in charged current muon neutrino interactions in the detector and its surroundings. Downward going muons are background for neutrino searches. These muons are the decay products of cosmic-ray collisions in the Earth's atmosphere far above the detector. This paper presents a method to identify and count electromagnetic showers induced along atmospheric muon tracks with the ANTARES detector. The method is applied to both cosmic muon data and simulations and its applicability to the reconstruction of muon event energies is demonstrated.
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