7 research outputs found
Search for non-standard neutrino interactions with 10 years of ANTARES data
Get PDFNon-standard interactions of neutrinos arising in many theories beyond the
Standard Model can significantly alter matter effects in atmospheric neutrino
propagation through the Earth. In this paper, a search for deviations from the
prediction of the standard 3-flavour atmospheric neutrino oscillations using
the data taken by the ANTARES neutrino telescope is presented. Ten years of
atmospheric neutrino data collected from 2007 to 2016, with reconstructed
energies in the range from 16 GeV to GeV, have been analysed. A
log-likelihood ratio test of the dimensionless coefficients
and
does not provide clear evidence of deviations from standard interactions. For
normal neutrino mass ordering, the combined fit of both coefficients yields a
value 1.7 away from the null result. However, the 68% and 95%
confidence level intervals for and
, respectively, contain the null
value. Best fit values, one standard deviation errors and bounds at the 90%
confidence level for these coefficients are given for both normal and inverted
mass orderings. The constraint on is among the most
stringent to date and it further restrains the strength of possible
non-standard interactions in the sector.Comment: 22 pages, 4 figure
Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA
Get PDFInternational audienceThe next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection threshold which allows to collect atmospheric neutrinos to study flavour oscillation. This paper reports the KM3NeT/ORCA sensitivity to this phenomenon. The event reconstruction, selection and classification are described. The sensitivity to determine the neutrino mass ordering was evaluated and found to be 4.4 if the true ordering is normal and 2.3 if inverted, after 3 years of data taking. The precision to measure and were also estimated and found to be and for normal neutrino mass ordering and, and for inverted ordering. Finally, a unitarity test of the leptonic mixing matrix by measuring the rate of tau neutrinos is described. Three years of data taking were found to be sufficient to exclude event rate variations larger than 20% at level
Sensitivity to light sterile neutrino mixing parameters with KM3NeT/ORCA
Get PDFInternational audienceKM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric neutrino oscillations studies. In this paper, the sensitivity of ORCA to the presence of a light sterile neutrino in a 3+1 model is presented. After three years of data taking, ORCA will be able to probe the active-sterile mixing angles θ, θ, θ and the effective angle θ, over a broad range of mass squared difference ∼ [10, 10] eV, allowing to test the eV-mass sterile neutrino hypothesis as the origin of short baseline anomalies, as well as probing the hypothesis of a very light sterile neutrino, not yet constrained by cosmology. ORCA will be able to explore a relevant fraction of the parameter space not yet reached by present measurements.[graphic not available: see fulltext
Nanobeacon: A time calibration device for the KM3NeT neutrino telescope
Get PDFThe KM3NeT Collaboration is currently constructing a multi-site high-energy
neutrino telescope in the Mediterranean Sea consisting of matrices of
pressure-resistant glass spheres, each holding a set of 31 small-area
photomultipliers. The main goals of the telescope are the observation of
neutrino sources in the Universe and the measurement of the neutrino
oscillation parameters with atmospheric neutrinos. Both extraterrestrial and
atmospheric neutrinos are detected through the Cherenkov light induced in
seawater by charged particles produced in neutrino interactions in the
surrounding medium. A relative time synchronization between photomultipliers of
the order of 1 ns is needed to guarantee the required angular resolution of the
detector. Due to the large detector volumes to be instrumented by KM3NeT, a
cost reduction of the different systems is a priority. To this end, the
inexpensive Nanobeacon has been designed and developed by the KM3NeT
Collaboration to be used for detector time-calibration studies. At present,
more than 600 Nanobeacons have been already produced. The characterization of
the optical pulse and the wavelength emission profile of the devices are
critical for the time calibration. In this paper, the main features of the
Nanobeacon design, production and operation, together with the main properties
of the light pulse generated are described
Implementation and first results of the KM3NeT real-time core-collapse supernova neutrino search
Get PDFThe authors acknowledge the financial support of the funding agencies: Agence Nationale de la Recherche (contract ANR-15-CE31-0020), Centre National de la Recherche Scientifique (CNRS), Commission Europeenne (FEDER fund and Marie Curie Program), Institut Universitaire de France (IUF), LabEx UnivEarthS (ANR-10-LABX-0023 and ANR-18-IDEX-0001), Paris ile-de-France Region, France; Shota Rustaveli National Science Foundation of Georgia (SRNSFG, FR-18-1268), Georgia; Deutsche Forschungsgemeinschaft (DFG), Germany; The General Secretariat of Research and Technology (GSRT), Greece; Istituto Nazionale di Fisica Nucleare (INFN), Ministero dell'Universita e della Ricerca (MIUR), PRIN 2017 program (Grant NAT-NET 2017W4HA7S) Italy; Ministry of Higher Education Scientific Research and Professional Training, ICTP through Grant AF-13, Morocco; Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO), the Netherlands; The National Science Centre, Poland (2015/18/E/ST2/00758); National Authority for Scientific Research (ANCS), Romania; Ministerio de Ciencia, Innovacion, Investigacion y Universidades (MCIU): Programa Estatal de Generacion de Conocimiento (refs. PGC2018-096663-B-C41, -A-C42, -B-C43, -B-C44) (MCIU/FEDER), Generalitat Valenciana: Prometeo (PROMETEO/2020/019), Grisolia (ref. GRISOLIA/2018/119) and GenT (refs. CIDEGENT/2018/034, /2019/043, /2020/049) programs, Junta de Andalucia (ref. A-FQM-053-UGR18), La Caixa Foundation (ref. LCF/BQ/IN17/11620019), EU: MSC program (ref. 101025085), Spain.The KM3NeT research infrastructure is unconstruction
in the Mediterranean Sea. KM3NeT will study
atmospheric and astrophysical neutrinos with two multipurpose
neutrino detectors, ARCA and ORCA, primarily
aimed at GeV–PeV neutrinos. Thanks to the multiphotomultiplier
tube design of the digital optical modules,
KM3NeT is capable of detecting the neutrino burst from
a Galactic or near-Galactic core-collapse supernova. This potential is already exploitable with the first detection units
deployed in the sea. This paper describes the real-time implementation
of the supernova neutrino search, operating on the
two KM3NeT detectors since the first months of 2019. A
quasi-online astronomy analysis is introduced to study the
time profile of the detected neutrinos for especially significant
events. Themechanism of generation and distribution of
alerts, aswell as the integration into theSNEWSandSNEWS
2.0 global alert systems, are described. The approach for the
follow-up of external alerts with a search for a neutrino excess
in the archival data is defined. Finally, an overviewof the current
detector capabilities and a report after the first two years
of operation are given.French National Research Agency (ANR)European Commission ANR-15-CE31-0020Centre National de la Recherche Scientifique (CNRS)Commission EuropeenneInstitut Universitaire de France (IUF)LabEx UnivEarthS ANR-10-LABX-0023
ANR-18-IDEX-0001Shota Rustaveli National Science Foundation of Georgia (SRNSFG), Georgia FR-18-1268German Research Foundation (DFG)Greek Ministry of Development-GSRTIstituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Universities and Research (MIUR)PRIN 2017 program, Italy NAT-NET 2017W4HA7SMinistry of Higher Education Scientific Research and Professional Training, ICTP, Morocco AF-13Netherlands Organization for Scientific Research (NWO)
Netherlands GovernmentNational Science Centre, Poland 2015/18/E/ST2/00758National Authority for Scientific Research (ANCS), RomaniaMinisterio de Ciencia, Innovacion, Investigacion y Universidades (MCIU): Programa Estatal de Generacion de Conocimiento PGC2018-096663-B-C41
PGC2018-096663-A-C42
PGC2018-096663-B-C43
PGC2018-096663-B-C44Generalitat Valenciana PROMETEO/2020/019Grisolia program GRISOLIA/2018/119
CIDEGENT/2018/034Junta de Andalucia A-FQM-053-UGR18La Caixa Foundation LCF/BQ/IN17/11620019EU: MSC program 101025085Paris Ile-de-France Region, FranceGenT program CIDEGENT/2018/034
CIDEGENT/2019/043
CIDEGENT/2020/04
Combined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass ordering
Get PDFThis article presents the potential of a combined analysis of the JUNO and KM3NeT/ORCA experiments to determine the neutrino mass ordering. This combination is particularly interesting as it significantly boosts the potential of either detector, beyond simply adding their neutrino mass ordering sensitivities, by removing a degeneracy in the determination of between the two experiments when assuming the wrong ordering. The study is based on the latest projected performances for JUNO, and on simulation tools using a full Monte Carlo approach to the KM3NeT/ORCA response with a careful assessment of its energy systematics. From this analysis, a determination of the neutrino mass ordering is expected after 6 years of joint data taking for any value of the oscillation parameters. This sensitivity would be achieved after only 2 years of joint data taking assuming the current global best-fit values for those parameters for normal ordering
Search for multimessenger sources of gravitational waves and high-energy neutrinos with advanced LIGO during its first observing run, Antares, and IceCube
Get PDFAstrophysical sources of gravitational waves, such as binary neutron star and black hole mergers or core-collapse supernovae, can drive relativistic outflows, giving rise to non-thermal high-energy emission. High-energy neutrinos are signatures of such outflows. The detection of gravitational waves and high-energy neutrinos from common sources could help establish the connection between the dynamics of the progenitor and the properties of the outflow. We searched for associated emission of gravitational waves and high-energy neutrinos from astrophysical transients with minimal assumptions using data from Advanced LIGO from its first observing run O1, and data from the ANTARES and IceCube neutrino observatories from the same time period. We focused on candidate events whose astrophysical origin could not be determined from a single messenger. We found no significant coincident candidate, which we used to constrain the rate density of astrophysical sources dependent on their gravitational wave and neutrino emission processes
