72 research outputs found
Neutrino trident scattering at the LHC energy regime
The neutrino trident scattering process in neutrino - tungsten interactions
at the LHC energy regime is investigated, and the cross-sections for different
leptonic final states in coherent and incoherent interactions are estimated.
Furthermore, the associated number of eventsat FASER2 detector is
estimated considering different predictions for the flux of incident neutrinos
on the detector, based on distinct hadronic models for the particle production
in collisions at ultra-forward rapidities. Our results indicate that the
observation of the neutrino trident process is, in principle, feasible at the
Forward Physics Facility.Comment: 7 pages, 5 figure
The DUNE far detector vertical drift technology. Technical design report
DUNE is an international experiment dedicated to addressing some of the questions at the forefront of particle physics and astrophysics, including the mystifying preponderance of matter over antimatter in the early universe. The dual-site experiment will employ an intense neutrino beam focused on a near and a far detector as it aims to determine the neutrino mass hierarchy and to make high-precision measurements of the PMNS matrix parameters, including the CP-violating phase. It will also stand ready to observe supernova neutrino bursts, and seeks to observe nucleon decay as a signature of a grand unified theory underlying the standard model. The DUNE far detector implements liquid argon time-projection chamber (LArTPC) technology, and combines the many tens-of-kiloton fiducial mass necessary for rare event searches with the sub-centimeter spatial resolution required to image those events with high precision. The addition of a photon detection system enhances physics capabilities for all DUNE physics drivers and opens prospects for further physics explorations. Given its size, the far detector will be implemented as a set of modules, with LArTPC designs that differ from one another as newer technologies arise. In the vertical drift LArTPC design, a horizontal cathode bisects the detector, creating two stacked drift volumes in which ionization charges drift towards anodes at either the top or bottom. The anodes are composed of perforated PCB layers with conductive strips, enabling reconstruction in 3D. Light-trap-style photon detection modules are placed both on the cryostat's side walls and on the central cathode where they are optically powered. This Technical Design Report describes in detail the technical implementations of each subsystem of this LArTPC that, together with the other far detector modules and the near detector, will enable DUNE to achieve its physics goals
First measurement of the total inelastic cross section of positively charged kaons on argon at energies between 5.0 and 7.5 GeV
ProtoDUNE Single-Phase (ProtoDUNE-SP) is a 770-ton liquid argon time projection chamber that operated in a hadron test beam at the CERN Neutrino Platform in 2018. We present a measurement of the total inelastic cross section of charged kaons on argon as a function of kaon energy using 6 and 7 GeV/c beam momentum settings. The flux-weighted average of the extracted inelastic cross section at each beam momentum setting was measured to be 380±26 mbarns for the 6 GeV/c setting and 379±35 mbarns for the 7 GeV/c setting
Atmospheric neutrino phenomenology with mass varying neutrinos
Orientador: Orlando Luis Goulart PeresTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb WataghinResumo: Neste trabalho obtemos de forma independente a descrição da distribuição angular dos eventos de neutrinos atmosféricos vistos pelo detector Super-Kamiokande tanto para as regiões de sub-GeV como multi-GeV. Para tal, estudamos de forma detalhada a seção de choque neutrinonucleon para processos de espalhamento via corrente carregada para todo o intervalo de energia pelo qual o fluxo de neutrinos atmosféricos se estende. Integramos então o produto do fluxo de neutrinos atmosféricos pela seção de choque de detecção dos neutrinos e pela probabilidade de oscilação padrão de neutrinos atmosféricos e obtemos a distribuição angular de eventos em Super-Kamiokande. Através de análise de X2 obtivemos uma região permitida para os parâmetros de oscilação padrão de neutrinos atmosféricos, a diferença quadrática de massas, e o ângulo de mistura, sen2(2?23), compatível com a existente na literatura. Como um teste para oscilação não padrão introduzimos o modelo de neutrinos com massa variável(MaVaN¿s), no qual a massa dos neutrinos depende da densidade do meio. Tal efeito é obtido ao incluir um acoplamento do tipo Yukawa entre os neutrinos e um campo escalar neutro cuja concentração depende da densidade do meio. Estudamos como a inclusão deste efeito altera a probabilidade de oscilação Pµ?µ e, consequentemente, a descrição dos dados de Super-Kamiokande. Obtemos um limite para o parâmetro aMaV aN responsável pela intensidade deste novo efeito, sendo que soluções cuja intensidade do efeito de MaVaN é de 40% ou maior, em comparação com a intensidade da oscilação padrção são excluídas com 90% de nível de confiançaAbstract: In this work we obtain in a independent way the description of the angular distribution of atmospheric neutrino events as seen by the Super-Kamiokande collaboration for the events in the sub-GeV and multi-GeV range. As a first step in this description, we study the neutrino-nucleon charged current cross section for the hole energy range of the experiment, and obtain the number of neutrino events as a function of energy and zenith angle. Including neutrino oscillations in the picture allows us to describe the data from the Super-Kamiokande experiment. We obtain the allowed region for the oscillation parameters ?m223 and sin2(2?23) in reasonable agreement with the result found in the literature. As a test for a non-standard oscillation mechanism we introduce the concept of MaVaN (Mass Varying Neutrinos), derived from the coupling of the neutrinos with a neutral scalar who has its concentration depending of local matter density. The neutrino oscillation probability so changes from the standard oscillation with consequences for the allowed region of oscillation parameters. The parameter amavan describes the relative weight of usual oscillation terms and the MaVaN terms, being aMaV aN = 1 when the two terms are equal. We have found that aMaV aN should be smaller then 0,4 at 90 % C.LDoutoradoFísicaDoutor em Ciência
Phenomenology of atmospheric neutrinos
Orientador: Orlando Luis Goulart PeresDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb WataghinResumo: Neste trabalho buscamos entender o fenômeno de oscilações de neutrinos e como exemplo tentamos descrever os dados dos neutrinos atmosféricos Nossa motivação principal é descrever o excesso de eventos do tipo neutrino eletrônico encontrado nos dados do detector SuperKamiokande (SK)a baixas energias quando comparados com o formalismo de oscilação de sabores de neutrinos em duas gerações,o qual resolve o problema da assimetria up-down para os neutrinos atmosféricos do tipo muônico. Para isso generalizamos o modelo de oscilação de sabores para três gerações de neutrinos, abrindo dessa forma a possibilidade de oscilação entre o neutrino eletrônico e os demais sabores.Obtemos uma solução semianalítica para o problema nos valendo dos limites impostos pela fenomenologia de neutrinos para os parâmetros de oscilação,diferenças quadráticas de massas e ângulos de mistura. Além disso levamos em conta os efeitos de matéria atuando sobre o neutrino eletrônico quando este cruza o interior terrestre e tem seu padrão de oscilação alteradoAbstract: In this work we try to understand the phenomena of neutrino oscillations,and use this to describe more precisely the atmospheric neutrino data.Our main motivation is to describe the excess of events of electron-neutrino type found in the SuperKamiokande results at low energies when compared with the predictions of the two-generation neutrino oscillation which solves the problem of the up-down muon neutrino asymmetry very successfully To do this we generalize the oscillationmodel from two to three neutrino flavors,opening the possibility of oscillation between the electron neutrino type and the others.Then we obtain a semi-analytic solution of the three flavors problem using the neutrino phenomenological limits on oscillation parameters,squared masses differences and mixing angles.We also take into account matter effects on the electronic neutrino when it crosses the Earth and has it ¿s oscillation pattern changedMestradoFísica das Particulas Elementares e CamposMestre em Físic
Neutrino trident scattering at the LHC energy regime
Abstract The neutrino trident scattering process in neutrino-tungsten interactions at the LHC energy regime is investigated, and the cross-sections for different leptonic final states in coherent and incoherent interactions are estimated. Furthermore, the associated number of events at FASER ν 2 detector is estimated considering different predictions for the flux of incident neutrinos on the detector, based on distinct hadronic models for the particle production in pp collisions at ultra-forward rapidities. Our results indicate that the observation of the neutrino trident process is, in principle, feasible at the Forward Physics Facility
Track signals at IceCube from subleading channels
Tracks events at the IceCube Observatory are characterized by an energetic
muon crossing several kilometers before decaying. Such muons are dominantly
produced in charged current (CC) muon neutrino - hadron interactions. However,
muons are also produced through the - boson production and in the decay of
tau leptons and heavy mesons created in neutral and charged current
interactions induced by all neutrino flavors. In this paper, we investigate the
contribution of these subleading channels to events characterized as tracks at
the IceCube. Our results indicate that these channels correspond to a non -
negligible fraction of the HESE track events. In addition, we show that its
contributions are concentrated in muons that are less energetic than those
arising from muonic neutrino CC interactions for the same visible energies of
the process. Finally, we investigate the impact of these additional channels on
the description of the astrophysical neutrino flux, and we find that the
inclusion of these subleading processes are important in determining the
parameters of the astrophysical neutrino flux.Comment: 9 pages, 6 figure
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