47 research outputs found
On the energy and baseline optimization to study effects related to the ÎŽ-phase (CP-/T-violation) in neutrino oscillations at a neutrino factory
In this paper we discuss the detection of CP- and T-violation effects in the framework of a neutrino factory. We introduce three quantities, which are good discriminants for a non-vanishing complex phase (ÎŽ) in the 3 Ă 3 neutrino mixing matrix: ÎÎŽ, ÎCP and ÎT. We find that these three discriminants (in vacuum) all scale with L/Ev, where L is the baseline and Ev the neutrino energy. Matter effects modify the scaling, but these effects are large enough to spoil the sensitivity only for baselines larger than 5000 km. So, in the hypothesis of constant neutrino factory power (i.e., number of muons inversely proportional to muon energy), the sensitivity on the ÎŽ-phase is independent of the baseline chosen. Specially interesting is the direct measurement of T-violation from the "wrong-sign" electron channel (i.e., the ÎT discriminant), which involves a comparison of the ve â vÎŒ and vÎŒ â ve oscillation rates. However, the vÎŒ â ve measurement requires magnetic discrimination of the electron charge, experimentally very challenging in a neutrino detector. Since the direction of the electron curvature has to be estimated before the start of the electromagnetic shower, low-energy neutrino beams and hence short baselines, are preferred. In this paper we show, as an example, the exclusion regions in the Îm212-ÎŽ plane using the ÎCP and ÎT discriminants for two concrete cases keeping the same L/Ev ratio (730 km/7.5 GeV and 2900 km/30 GeV). We obtain a similar excluded region provided that the electron detection efficiency is âŒ20% and the charge confusion 0.1%. The Îm212 compatible with the LMA solar data can be tested with a flux of 5 Ă 1021 muons. We compare these results with the fit of the visible energy distributions. © 2002 Elsevier Science B.V. All rights reserved
Neutrino cross-section measurement with neutrinos from muon decay
In this paper we stress the idea that new, more precise neutrino
cross-sections measurements at low energies will be necessary to improve the
results of future big neutrino detectors, which will be dominated by the
contribution of the systematic errors. The use of a muon beam instead of the
traditional pion beams is proposed. This choice allows the simultaneous
measurement of both, numu and nue interactions and the two helicities, in a
clean environment and with a precise knowledge of the beam flux. We show that
with approx 10^{15} mu's/year and a moderate mass detector (approx 100 tons)
placed close to the muon storage ring, precisions of the order of 10% in
sigma(nu) (E_nu bin size of 100 MeV) can be reached for neutrino energies below
2 GeV.Comment: 4 pages, proceeding to NUFACT0
Searches for neutrino counterparts of gravitational waves from the LIGO/Virgo third observing run with KM3NeT
The KM3NeT neutrino telescope is currently being deployed at two different sites
in the Mediterranean Sea. First searches for astrophysical neutrinos have been performed using
data taken with the partial detector configuration already in operation. The paper presents
the results of two independent searches for neutrinos from compact binary mergers detected
during the third observing run of the LIGO and Virgo gravitational wave interferometers.
The first search looks for a global increase in the detector counting rates that could be
associated with inverse beta decay events generated by MeV-scale electron anti-neutrinos.
The second one focuses on upgoing track-like events mainly induced by muon (anti-)neutrinos
in the GeVâTeV energy range. Both searches yield no significant excess for the sources in the
gravitational wave catalogs. For each source, upper limits on the neutrino flux and on the
total energy emitted in neutrinos in the respective energy ranges have been set. Stacking
analyses of binary black hole mergers and neutron star-black hole mergers have also been
performed to constrain the characteristic neutrino emission from these categories.Grants PID2021-124591NB-C41, -C42, -C43 funded by MCIN/AEI/10.13039/501100011033 and, as appropriate, by âERDF A way of making Europeâ, by the âEuropean Unionâ or by the âEuropean Union NextGenerationEU/PRTRâPrograma de Planes Complementarios I+D+I (refs. ASFAE/2022/023, ASFAE/2022/014)Programa Prometeo (PROMETEO/2020/019) and GenT (refs. CIDEGENT/2018/034, /2019/043, /2020/049. /2021/23) of the Generalitat ValencianaJunta de AndalucĂa (ref. SOMM17/6104/UGR, P18-FR-5057)MSC program (ref. 101025085)Programa MarĂa Zambrano (Spanish Ministry of Universities, funded by the European Union, NextGenerationEU)The European
Unionâs Horizon 2020 Research and Innovation Programme (ChETEC-INFRA â Project no.
101008324)Francqui foundatio
Probing invisible neutrino decay with KM3NeT/ORCA
The 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 EuropĂ©enne (FEDER fund and Marie Curie Program), LabEx UnivEarthS (ANR-10-LABX-0023 and ANR-18-IDEX-0001), Paris Ăle-de-France Region, France; The General Secretariat of Research and Innovation (GSRI), Greece Istituto Nazionale di Fisica Nucleare (INFN), Ministero dellâUniversitĂ e della Ricerca (MIUR), PRIN 2017 program (Grant NAT-NET 2017W4HA7S) Italy; Ministry of Higher Education, Scientific Research and Innovation, Morocco, and the Arab Fund for Economic and Social Development, Kuwait; Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO), the Netherlands; The National Science Centre, Poland (2021/41/N/ST2/01177); National Authority for Scientific Research (ANCS), Romania; Grants PID2021-124591NB-C41, -C42, -C43 funded by MCIN/AEI/ 10.13039/501100011033 and, as appropriate, by âERDF A way of making Europeâ, by the âEuropean Unionâ or by the âEuropean Union NextGenerationEU/PRTRâ, Programa de Planes Complementarios I+D+I (refs. ASFAE/2022/023, ASFAE/2022/014), Programa Prometeo (PROMETEO/2020/019) and GenT (refs. CIDEGENT/2018/034, /2019/043, /2020/049. /2021/23) of the Generalitat Valenciana, Junta de AndalucĂa (ref. SOMM17/6104/UGR, P18-FR-5057), EU: MSC program (ref. 101025085), Programa MarĂa Zambrano (Spanish Ministry of Universities, funded by the European Union, NextGenerationEU), Spain.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 v3 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/alpha 3 = T3/m3 < 180 ps/eV at 90% confidence level, assuming true normal ordering. Finally, the impact of neutrino decay on the precision of KM3NeT/ORCA measurements for theta(23), Delta m(31)(2) and mass ordering have been studied. No significant effect of neutrino decay on the sensitivity to these measurements has been found.Commission EuropĂ©enne FEDER fundCommission EuropĂ©enn Marie Curie ProgramMCIN/AEI/ 10.13039/501100011033, ID2021-124591NB-C41, -C42,
-C43ERDFEuropean UnionEuropean Union NextGenerationEU/PRTRPlanes Complementarios I+D+I, ASFAE/2022/023,
ASFAE/2022/014PROMETEO/2020/019Generalitat Valenciana, GenT, CIDEGENT/2018/034, /2019/043, /2020/049, /2021/23Junta de
AndalucĂa SOMM17/6104/UGR, P18-FR-5057EU: MSC program 101025085European
Union, NextGenerationEU, Programa MarĂa Zambran
The KM3NeT multi-PMT optical module
The optical module of the KM3NeT neutrino telescope is an innovative multi-faceted
large area photodetection module. It contains 31 three-inch photomultiplier tubes in a single 0.44m
diameter pressure-resistant glass sphere. The module is a sensory device also comprising calibration
instruments and electronics for power, readout and data acquisition. It is capped with a breakout-box
with electronics for connection to an electro-optical cable for power and long-distance communication
to the onshore control station. The design of the module was qualified for the first time in the deep sea
in 2013. Since then, the technology has been further improved to meet requirements of scalability,
cost-effectiveness and high reliability. The module features a sub-nanosecond timing accuracy
and a dynamic range allowing the measurement of a single photon up to a cascade of thousands
of photons, suited for the measurement of the Cherenkov radiation induced in water by secondary
particles from interactions of neutrinos with energies in the range of GeV to PeV. A distributed
production model has been implemented for the delivery of more than 6000 modules in the coming
few years with an average production rate of more than 100 modules per month. In this paper a
review is presented of the design of the multi-PMT KM3NeT optical module with a proven effective
background suppression and signal recognition and sensitivity to the incoming direction of photons.French National Research Agency (ANR) ANR-15-CE31-0020
Centre National de la Recherche Scientifique (CNRS)Commission Europeenne (FEDER fund)
Commission Europeenne (Marie Curie Program)Institut Universitaire de France (IUF)LabEx UnivEarthS ANR-10-LABX-0023
ANR-18-IDEX-0001Paris Ile-de-France Region, FranceShota Rustaveli National Science Foundation of Georgia (SRNSFG), Georgia FR-18-1268German Research Foundation (DFG)Greek Ministry of Development-GSRTIstituto Nazionale di Fisica Nucleare (INFN), Ministero dell'Universita e della Ricerca (MIUR), PRIN 2017 program, Italy NAT-NET 2017W4HA7SMinistry of Higher Education, Scientific Research and Innovation, MoroccoArab Fund for Economic and Social DevelopmentNederlandse organisatie voor Wetenschappelk Onderzoek (NWO), the NetherlandsNational 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-C44Center for Forestry Research & Experimentation (CIEF) PROMETEO/2020/019Generalitat Valenciana: Grisolia program GRISOLIA/2018/119
GRISOLIA/2021/192
Generalitat Valenciana: GenT program CIDEGENT/2018/034
CIDEGENT/2019/043
CIDEGENT/2020/049
CIDEGENT/2021/023Junta de Andalucia AFQM-053-UGR18La Caixa Foundation LCF/BQ/IN17/11620019EU: MSC program, Spain 10102508
Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA
The 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), Severo Ochoa Centre of Excellence and MultiDark Consolider (MCIU), Junta de Andalucia (ref. SOMM17/6104/UGR), Generalitat Valenciana: Grisolia (ref. GRISOLIA/2018/119) and GenT (ref. CIDEGENT/2018/034 and CIDEGENT/2019/043) programs, La Caixa Foundation (ref. LCF/BQ/IN17/11620019), EU: MSC program (ref. 713673), Spain.The 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 sigma if the true ordering is normal and 2.3 sigma if inverted, after 3 years of data taking. The precision to measure Delta m(32)(2) and theta(23) were also estimated and found to be 85.10(-6) eV(2) and ((+1.9)(-3.1))degrees for normal neutrino mass ordering and, 75.10(-6) eV(2) and ((+2.0)(-7.0))degrees 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 (nu)over-left-right-arrow tau event rate variations larger than 20% at 3 sigma level.French National Research Agency (ANR) ANR-15-CE31-0020
Centre National de la Recherche Scientifique (CNRS)
Commission Europeenne (FEDER fund), France
Institut Universitaire de France (IUF), France
LabEx UnivEarthS, France ANR-10-LABX-0023
ANR-18-IDEX-0001
Paris Ile-de-France Region, FranceShota Rustaveli National Science Foundation of Georgia (SRNSFG), Georgia FR-18-1268German Research Foundation (DFG)The General Secretariat of Research and Technology (GSRT), GreeceIstituto 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 GovernmentThe National 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, Spain PGC2018-096663-B-C41
PGC2018-096663-A-C42
PGC2018-096663-B-C43
PGC2018-096663-B-C44
Generalitat Valenciana: Grisolia program, Spain GRISOLIA/2018/119
La Caixa Foundation LCF/BQ/IN17/11620019EU: MSC program, Spain 713673Commission Europeenne (Marie Curie Program), FranceGeneralitat Valenciana: GenT programs, Spain CIDEGENT/2018/034
CIDEGENT/2019/043Ministerio de Ciencia, Innovacion, Investigacion y Universidades (MCIU): Severo Ochoa Centre of ExcellenceMinisterio de Ciencia, Innovacion, Investigacion y Universidades (MCIU): MultiDark Consolider (MCIU)Junta de Andalucia
European Commission SOMM17/6104/UG
On the energy and baseline optimization to study effects related to the -phase (CP-/T-violation) in neutrino oscillations at a Neutrino Factory
In this paper we discuss the detection of CP and T-violation effects in the
framework of a neutrino factory. We introduce three quantities, which are good
discriminants for a non vanishing complex phase () in the
neutrino mixing matrix. We find that these three discriminants (in vacuum) all
scale with . Matter effects modify the scaling, but these effects
are large enough to spoil the sensitivity only for baselines larger than 5000
km. So, in the hypothesis of constant neutrino factory power, the sensitivity
on the -phase is independent of the baseline chosen. Specially
interesting is the direct measurement of T-violation from the ``wrong-sign''
electron channel, which involves a comparison of the \nue\ra\numu and
\numu\ra\nue oscillation rates. However, the \numu\ra\nue measurement
requires magnetic discrimination of the electron charge, experimentally very
challenging in a neutrino detector: low-energy neutrino beams and hence short
baselines, are preferred. In this paper we show the exclusion regions in the
plane for two concrete cases. We obtain a similar
excluded region provided that the electron detection efficiency is 20%
and the charge confusion 0.1%. The compatible with the LMA
solar data can be tested with a flux of 5 muons. We compare
these results with the fit of the visible energy distributions.Comment: 58 pages, 24 figure
The ArDM experiment
The aim of the ArDM project is the development and operation of a one ton
double-phase liquid argon detector for direct Dark Matter searches. The
detector measures both the scintillation light and the ionization charge from
ionizing radiation using two independent readout systems. This paper briefly
describes the detector concept and presents preliminary results from the ArDM
R&D program, including a 3 l prototype developed to test the charge readout
system.Comment: Proceedings of the Epiphany 2010 Conference, to be published in Acta
Physica Polonica
First results on light readout from the 1-ton ArDM liquid argon detector for dark matter searches
ArDM-1t is the prototype for a next generation WIMP detector measuring both
the scintillation light and the ionization charge from nuclear recoils in a
1-ton liquid argon target. The goal is to reach a minimum recoil energy of
30\,keVr to detect recoiling nuclei. In this paper we describe the experimental
concept and present results on the light detection system, tested for the first
time in ArDM on the surface at CERN. With a preliminary and incomplete set of
PMTs, the light yield at zero electric field is found to be between 0.3-0.5
phe/keVee depending on the position within the detector volume, confirming our
expectations based on smaller detector setups.Comment: 14 pages, 10 figures, v2 accepted for publication in JINS