1,402 research outputs found

    Hint for a TeV neutrino emission from the Galactic Ridge with ANTARES

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    International audienceInteractions of cosmic ray protons, atomic nuclei, and electrons in the interstellar medium in the inner part of the Milky Way produce a γ\gamma-ray flux from the Galactic Ridge. If the γ\gamma-ray emission is dominated by proton and nuclei interactions, a neutrino flux comparable to the γ\gamma-ray flux is expected from the same sky region. Data collected by the ANTARES neutrino telescope are used to constrain the neutrino flux from the Galactic Ridge in the 1-100 TeV energy range. Neutrino events reconstructed both as tracks and showers are considered in the analysis and the selection is optimized for the search of an excess in the region ∣l∣<30deg⁡|l| < 30\deg, ∣b∣<2deg⁡|b| < 2\deg. The expected background in the search region is estimated using an off region with similar sky coverage. Neutrino signal originating from a power-law spectrum with slope ranging from Γν=1\Gamma_\nu=1 to 44 is simulated in both channels. The observed energy distributions are fitted to constrain the neutrino emission from the Ridge. The energy distributions in the signal region are inconsistent with the background expectation at ∼96%\sim 96\% confidence level. The mild excess over the background is consistent with a neutrino flux with a power law with a slope 2.45−0.34+0.222.45^{+0.22}_{-0.34} and a flux normalization dNν/dEν=4.0−2.0+2.7×10−16GeV−1cm−2s−1sr−1dN_\nu/dE_\nu = 4.0^{+2.7}_{-2.0} \times 10^{-16} \text{GeV}^{-1} \text{cm}^{-2} \text{s}^{-1} \text{sr}^{-1} at 40 TeV reference energy. Such flux is consistent with the expected neutrino signal if the bulk of the observed γ\gamma-ray flux from the Galactic Ridge originates from interactions of cosmic ray protons and nuclei with a power-law spectrum extending well into the PeV energy range

    Pso-Reg: a web registry for psoriasis in real life

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    Background: Psoriasis (PsO) is a common immune mediated inflammatory disease, affecting about 60 million people worldwide. Although current therapies have dramatically changed the therapeutic approach to the disease, the heterogeneity of responses often results in an essential unmet clinical need. This study describes the design and development of the Psoriasis Registry (Pso-Reg), an Italian electronic-based-registry, aimed to collect real life data of patients with psoriasis. Methods: Pso-Reg is a multicenter, retrospective and observational cohort study based on the Research Electronic Data Capture (REDcap) tool. Five Italian medical centres were part of the network and all patients affected by PsO were included in the study. Socio-demographic, clinical characteristics, laboratory findings and therapies were collected, and descriptive analysis was carried out. Results: Among the 768 patients analyzed, 446 were men (58.1%), with a mean age of 55.5 years. The first more frequent comorbidity was psoriatic arthritis (26.8%), followed by hypertension (25.3%), diabetes (10%) and dyslipidemia (11.7%). Of the entire cohort, 240 patients (38.2%) had a positive family history for PsO. Vulgar type was the most common phenotype (85.5%), with a major involvement of the scalp (13.8%). The mean PASI (Psoriasis Area Severity Index) score at the baseline was 7.5 (7.8). At the enrolment, 107 patients were treated with topic treatments (13.9%), 5 with phototherapy (0.7%), 92 with cDMARDs (conventional disease-modifying anti-rheumatic drugs) (12.0%) and 471 with biologic therapies (61.3%). Conclusions: Real-life data from Pso-Reg could contribute providing the rationale for an individual-based strategy and a more tailored approach for the management of psoriasis

    KM3NeT broadcast optical data transport system

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    International audienceThe optical data transport system of the KM3NeT neutrino telescope at the bottom of the Mediterranean Sea will provide more than 6000 optical modules in the detector arrays with a point-to-point optical connection to the control stations onshore. The ARCA and ORCA detectors of KM3NeT are being installed at a depth of about 3500 m and 2500 m, respectively and their distance to the control stations is about 100 kilometers and 40 kilometers. In particular, the two detectors are optimised for the detection of cosmic neutrinos with energies above about 1 TeV (ARCA) and for the detection of atmospheric neutrinos with energies in the range 1 GeV–1 TeV (ORCA). The expected maximum data rate is 200 Mbps per optical module. The implemented optical data transport system matches the layouts of the networks of electro-optical cables and junction boxes in the deep sea. For efficient use of the fibres in the system the technology of Dense Wavelength Division Multiplexing is applied. The performance of the optical system in terms of measured bit error rates, optical budget are presented. The next steps in the implementation of the system are also discussed

    Probing invisible neutrino decay with KM3NeT-ORCA

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    International audienceIn the era of precision measurements of the neutrino oscillation parameters, upcoming neutrino experiments will also be sensitive to physics beyond the Standard Model. KM3NeT/ORCA is a neutrino detector optimised for measuring atmospheric neutrinos from a few GeV to around 100 GeV. In this paper, the sensitivity of the KM3NeT/ORCA detector to neutrino decay has been explored. A three-flavour neutrino oscillation scenario, where the third neutrino mass state ν3\nu_3 decays into an invisible state, e.g. a sterile neutrino, is considered. We find that KM3NeT/ORCA would be sensitive to invisible neutrino decays with 1/α3=τ3/m3<1801/\alpha_3=\tau_3/m_3 < 180~ps/eV\mathrm{ps/eV} at 90%90\% confidence level, assuming true normal ordering. Finally, the impact of neutrino decay on the precision of KM3NeT/ORCA measurements for θ23\theta_{23}, Δm312\Delta m^2_{31} and mass ordering have been studied. No significant effect of neutrino decay on the sensitivity to these measurements has been found

    Searches for neutrinos in the direction of radio-bright blazars with the ANTARES telescope

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    International audienceActive galaxies, especially blazars, are among the most promising neutrino source candidates. To date, ANTARES searches for these objects considered GeV-TeV γ\gamma-ray bright blazars. Here, a statistically complete radio-bright blazar sample is used as the target for searches of origins of neutrinos collected by the ANTARES neutrino telescope over 13 years of operation. The hypothesis of a neutrino-blazar directional correlation is tested by pair counting and by a complementary likelihood-based approach. The resulting post-trial pp-value is 3.0%3.0\% (2.2σ2.2\sigma in the two-sided convention), possibly indicating a correlation. Additionally, a time-dependent analysis is performed to search for temporal clustering of neutrino candidates as a mean of detecting neutrino flares in blazars. None of the investigated sources alone reaches a significant flare detection level. However, the presence of 18 sources with a pre-trial significance above 3σ3\sigma indicates a p=1.4%p=1.4\% (2.5σ2.5\sigma in the two-sided convention) detection of a time-variable neutrino flux. An \textit{a posteriori} investigation reveals an intriguing temporal coincidence of neutrino, radio, and γ\gamma-ray flares of the J0242+1101 blazar at a p=0.5%p=0.5\% (2.9σ2.9\sigma in the two-sided convention) level. Altogether, the results presented here suggest a possible connection of neutrino candidates detected by the ANTARES telescope with radio-bright blazars

    Search for neutrino counterparts to the gravitational wave sources from O3 catalogues with the ANTARES detector

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    International audienceSince 2015 the LIGO and Virgo interferometers have detected gravitational waves from almost one hundred coalescences of compact objects (black holes and neutron stars). This article presents the results of a search performed with data from the ANTARES telescope to identify neutrino counterparts to the gravitational wave sources detected during the third LIGO/Virgo observing run and reported in the catalogues GWTC-2, GWTC-2.1, and GWTC-3. This search is sensitive to all-sky neutrinos of all flavours and of energies >100 >100\,GeV, thanks to the inclusion of both track-like events (mainly induced by νμ\nu_\mu charged-current interactions) and shower-like events (induced by other interaction types). Neutrinos are selected if they are detected within ±500 \pm 500\,s from the GW merger and with a reconstructed direction compatible with its sky localisation. No significant excess is found for any of the 80 analysed GW events, and upper limits on the neutrino emission are derived. Using the information from the GW catalogues and assuming isotropic emission, upper limits on the total energy Etot,νE_{\rm tot, \nu} and on the fraction of the total energy budget fν=Etot,ν/Eradf_\nu = E_{\rm tot, \nu}/E_{\rm rad} emitted as neutrinos of all flavours are also computed. Finally, a stacked analysis of all the 72 binary black hole mergers (respectively the 7 neutron star - black hole merger candidates) has been performed to constrain the typical neutrino emission within this population, leading to the limits: Etot,ν<4.0×1053 E_{\rm tot, \nu} < 4.0 \times 10^{53}\,erg and fν<0.15f_\nu < 0.15 (respectively, Etot,ν<3.2×1053 E_{\rm tot, \nu} < 3.2 \times 10^{53}\,erg and fν<0.88f_\nu < 0.88) for E−2E^{-2} spectrum and isotropic emission. Other assumptions including softer spectra and non-isotropic scenarios have also been tested

    Searches for neutrinos in the direction of radio-bright blazars with the ANTARES telescope

    No full text
    International audienceActive galaxies, especially blazars, are among the most promising neutrino source candidates. To date, ANTARES searches for these objects considered GeV-TeV γ\gamma-ray bright blazars. Here, a statistically complete radio-bright blazar sample is used as the target for searches of origins of neutrinos collected by the ANTARES neutrino telescope over 13 years of operation. The hypothesis of a neutrino-blazar directional correlation is tested by pair counting and by a complementary likelihood-based approach. The resulting post-trial pp-value is 3.0%3.0\% (2.2σ2.2\sigma in the two-sided convention), possibly indicating a correlation. Additionally, a time-dependent analysis is performed to search for temporal clustering of neutrino candidates as a mean of detecting neutrino flares in blazars. None of the investigated sources alone reaches a significant flare detection level. However, the presence of 18 sources with a pre-trial significance above 3σ3\sigma indicates a p=1.4%p=1.4\% (2.5σ2.5\sigma in the two-sided convention) detection of a time-variable neutrino flux. An \textit{a posteriori} investigation reveals an intriguing temporal coincidence of neutrino, radio, and γ\gamma-ray flares of the J0242+1101 blazar at a p=0.5%p=0.5\% (2.9σ2.9\sigma in the two-sided convention) level. Altogether, the results presented here suggest a possible connection of neutrino candidates detected by the ANTARES telescope with radio-bright blazars

    Probing invisible neutrino decay with KM3NeT-ORCA

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    In the era of precision measurements of the neutrino oscillation parameters, upcoming neutrino experiments will also be sensitive to physics beyond the Standard Model. KM3NeT/ORCA is a neutrino detector optimised for measuring atmospheric neutrinos from a few GeV to around 100 GeV. In this paper, the sensitivity of the KM3NeT/ORCA detector to neutrino decay has been explored. A three-flavour neutrino oscillation scenario, where the third neutrino mass state ν3\nu_3 decays into an invisible state, e.g. a sterile neutrino, is considered. We find that KM3NeT/ORCA would be sensitive to invisible neutrino decays with 1/α3=τ3/m3<1801/\alpha_3=\tau_3/m_3 < 180~ps/eV\mathrm{ps/eV} at 90%90\% confidence level, assuming true normal ordering. Finally, the impact of neutrino decay on the precision of KM3NeT/ORCA measurements for θ23\theta_{23}, Δm312\Delta m^2_{31} and mass ordering have been studied. No significant effect of neutrino decay on the sensitivity to these measurements has been found.Comment: 27 pages, 14 figures, bibliography updated, typos correcte

    Studying Bioluminescence Flashes with the ANTARES Deep Sea Neutrino Telescope

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    International audienceWe develop a novel technique to exploit the extensive data sets provided by underwater neutrino telescopes to gain information on bioluminescence in the deep sea. The passive nature of the telescopes gives us the unique opportunity to infer information on bioluminescent organisms without actively interfering with them. We propose a statistical method that allows us to reconstruct the light emission of individual organisms, as well as their location and movement. A mathematical model is built to describe the measurement process of underwater neutrino telescopes and the signal generation of the biological organisms. The Metric Gaussian Variational Inference algorithm is used to reconstruct the model parameters using photon counts recorded by the neutrino detectors. We apply this method to synthetic data sets and data collected by the ANTARES neutrino telescope. The telescope is located 40 km off the French coast and fixed to the sea floor at a depth of 2475 m. The runs with synthetic data reveal that we can reliably model the emitted bioluminescent flashes of the organisms. Furthermore, we find that the spatial resolution of the localization of light sources highly depends on the configuration of the telescope. Precise measurements of the efficiencies of the detectors and the attenuation length of the water are crucial to reconstruct the light emission. Finally, the application to ANTARES data reveals the first precise localizations of bioluminescent organisms using neutrino telescope data

    KM3NeT broadcast optical data transport system

    No full text
    International audienceThe optical data transport system of the KM3NeT neutrino telescope at the bottom of the Mediterranean Sea will provide more than 6000 optical modules in the detector arrays with a point-to-point optical connection to the control stations onshore. The ARCA and ORCA detectors of KM3NeT are being installed at a depth of about 3500 m and 2500 m, respectively and their distance to the control stations is about 100 kilometers and 40 kilometers. In particular, the two detectors are optimised for the detection of cosmic neutrinos with energies above about 1 TeV (ARCA) and for the detection of atmospheric neutrinos with energies in the range 1 GeV–1 TeV (ORCA). The expected maximum data rate is 200 Mbps per optical module. The implemented optical data transport system matches the layouts of the networks of electro-optical cables and junction boxes in the deep sea. For efficient use of the fibres in the system the technology of Dense Wavelength Division Multiplexing is applied. The performance of the optical system in terms of measured bit error rates, optical budget are presented. The next steps in the implementation of the system are also discussed
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