Electromagnetic showers reconstruction and analysis in the OPERA experiment and neutrino oscillation study by electron detection.
Identifieur interne : 000073 ( Hal/Corpus ); précédent : 000072; suivant : 000074Electromagnetic showers reconstruction and analysis in the OPERA experiment and neutrino oscillation study by electron detection.
Auteurs : Florian BrunetSource :
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Abstract
An international program is ongoing to measure the neutrino oscillation phenomenon and to determine the neutrino mixing matrix (MNSP) parameters. OPERA is a long-baseline neutrino experiment located at the Gran Sasso Laboratory in Italy, 730~km from CERN, downstream in the CNGS neutrino beam. The OPERA experiment is designed and optimised for a direct appearance search of νµ → ντ oscillations. It can also detect the νµ → νe oscillation driven by sin(2θ13)2 , where θ13 is the last mixing angle finally measured by the Daya Bay, RENO, and Double Chooz experiments in 2012. To observe the presence of ντ interactions in the beam, the OPERA detector is composed of calorimetric targets made of a modular structure called the "brick": a sandwich of lead plates interspaced with emulsion layers. The latter allows reconstructing tracks of charged particles produced in the neutrino interactions with a micrometric resolution. The search for the νµ → νe oscillation signal is based on the capability of identifying the electrons, rejecting background events where neutral pions are produced and keeping under control the intrinsic and dominant background source from the beam contamination. This work aims to elaborate analysis methods to improve the OPERA detector performance in the νµ → νe oscillation search.
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OPERA is a long-baseline neutrino experiment located at the Gran Sasso Laboratory in Italy, 730~km from CERN, downstream in the CNGS neutrino beam. The OPERA experiment is designed and optimised for a direct appearance search of νµ → ντ oscillations. It can also detect the νµ → νe oscillation driven by sin(2θ13)2 , where θ13 is the last mixing angle finally measured by the Daya Bay, RENO, and Double Chooz experiments in 2012. To observe the presence of ντ interactions in the beam, the OPERA detector is composed of calorimetric targets made of a modular structure called the "brick": a sandwich of lead plates interspaced with emulsion layers. The latter allows reconstructing tracks of charged particles produced in the neutrino interactions with a micrometric resolution. The search for the νµ → νe oscillation signal is based on the capability of identifying the electrons, rejecting background events where neutral pions are produced and keeping under control the intrinsic and dominant background source from the beam contamination. This work aims to elaborate analysis methods to improve the OPERA detector performance in the νµ → νe oscillation search.</div></front></TEI><hal api="V3"><titleStmt><title xml:lang="en">Electromagnetic showers reconstruction and analysis in the OPERA experiment and neutrino oscillation study by electron detection.</title><title xml:lang="fr">Reconstruction et analyse des gerbes électromagnétiques dans l'expérience OPERA et étude des oscillations neutrino avec détection d'électrons</title><author role="aut"><persName><forename type="first">Florian</forename><forename type="middle">Brunet</forename><surname>Brunet</surname></persName><email></email><idno type="halauthor">1175645</idno><idno type="IdRef">http://www.idref.fr/172489814</idno><affiliation ref="#struct-129"></affiliation></author><editor role="depositor"><persName><forename>ABES</forename><surname>STAR</surname></persName><email>thelec@abes.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2014-02-15 13:52:13</date><date type="whenModified">2015-06-12 01:06:17</date><date type="whenReleased">2014-02-19 09:31:29</date><date type="whenProduced">2012-12-12</date><date type="whenEndEmbargoed">2014-02-15</date><ref type="file" target="https://tel.archives-ouvertes.fr/tel-00947334/document"><date notBefore="2014-02-15"></date></ref><ref type="file" subtype="author" n="1" target="https://tel.archives-ouvertes.fr/tel-00947334/file/38252_BRUNET_2012_diffusion.pdf"><date notBefore="2014-02-15"></date></ref></edition><respStmt><resp>contributor</resp><name key="131274"><persName><forename>ABES</forename><surname>STAR</surname></persName><email>thelec@abes.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">tel-00947334</idno><idno type="halUri">https://tel.archives-ouvertes.fr/tel-00947334</idno><idno type="halBibtex">brunet:tel-00947334</idno><idno type="halRefHtml">Autre [cond-mat.other]. Université de Grenoble, 2012. Français. <NNT : 2012GRENY108></idno><idno type="halRef">Autre [cond-mat.other]. Université de Grenoble, 2012. Français. <NNT : 2012GRENY108></idno></publicationStmt><seriesStmt><idno type="stamp" n="STAR">STAR - Dépôt national des thèses électroniques</idno><idno type="stamp" n="LAPP">Laboratoire d'Annecy le Vieux de Physique des Particules</idno><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="UNIV-SAVOIE">Université Savoie Mont Blanc</idno><idno type="stamp" n="UGA">HAL Grenoble Alpes</idno><idno type="stamp" n="IN2P3">Institut National de Physique Nucléaire et de Physique des Particules</idno><idno type="stamp" n="THESES-EN-LIGNE-DAGROCAMPUS-OUEST">Thèses d'AGROCAMPUS OUEST</idno></seriesStmt><notesStmt></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Electromagnetic showers reconstruction and analysis in the OPERA experiment and neutrino oscillation study by electron detection.</title><title xml:lang="fr">Reconstruction et analyse des gerbes électromagnétiques dans l'expérience OPERA et étude des oscillations neutrino avec détection d'électrons</title><author role="aut"><persName><forename type="first">Florian</forename><forename type="middle">Brunet</forename><surname>Brunet</surname></persName><idno type="halAuthorId">1175645</idno><idno type="IdRef">http://www.idref.fr/172489814</idno><affiliation ref="#struct-129"></affiliation></author></analytic><monogr><idno type="nnt">2012GRENY108</idno><imprint><date type="dateDefended">2012-12-12</date></imprint><authority type="institution">Université de Grenoble</authority><authority type="school">École doctorale de physique (Grenoble)</authority><authority type="supervisor">Amina Zghiche</authority><authority type="jury">Yannis Karyotakis [Président]</authority><authority type="jury">Marcos Dracos [Rapporteur]</authority><authority type="jury">Georges Vasseur [Rapporteur]</authority><authority type="jury">Lounis Abdenour</authority></monogr></biblStruct></sourceDesc><profileDesc><langUsage><language ident="fr">French</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">Monte-Carlo simulation</term><term xml:lang="en">Electromagnetic shower</term><term xml:lang="en">Mixing angle</term><term xml:lang="fr">Simulation Monte-Carlo</term><term xml:lang="fr">OPERA</term><term xml:lang="fr">Neutrino</term><term xml:lang="fr">Oscillation</term><term xml:lang="fr">Angle de mélange</term><term xml:lang="fr">Gerbe électromagnétique</term></keywords><classCode scheme="halDomain" n="phys.cond.cm-gen">Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]</classCode><classCode scheme="halTypology" n="THESE">Theses</classCode></textClass><abstract xml:lang="en">An international program is ongoing to measure the neutrino oscillation phenomenon and to determine the neutrino mixing matrix (MNSP) parameters. OPERA is a long-baseline neutrino experiment located at the Gran Sasso Laboratory in Italy, 730~km from CERN, downstream in the CNGS neutrino beam. The OPERA experiment is designed and optimised for a direct appearance search of νµ → ντ oscillations. It can also detect the νµ → νe oscillation driven by sin(2θ13)2 , where θ13 is the last mixing angle finally measured by the Daya Bay, RENO, and Double Chooz experiments in 2012. To observe the presence of ντ interactions in the beam, the OPERA detector is composed of calorimetric targets made of a modular structure called the "brick": a sandwich of lead plates interspaced with emulsion layers. The latter allows reconstructing tracks of charged particles produced in the neutrino interactions with a micrometric resolution. The search for the νµ → νe oscillation signal is based on the capability of identifying the electrons, rejecting background events where neutral pions are produced and keeping under control the intrinsic and dominant background source from the beam contamination. This work aims to elaborate analysis methods to improve the OPERA detector performance in the νµ → νe oscillation search.</abstract><abstract xml:lang="fr">Un vaste programme international est en cours pour déterminer les paramètres du phénomène d'oscillation des neutrinos et approfondir la connaissance de la matrice de mélange des neutrinos (MNSP). Le détecteur OPERA, qui est installé dans le laboratoire souterrain du Gran Sasso en Italie, a pour but principal de mettre en évidence l'apparition de neutrinos de type tau dans un faisceau de neutrinos initialement de type muon, produit au CERN (CNGS) 730 km en amont. Il est aussi en mesure de détecter les oscillations des neutrinos muon en neutrinos électron, donnant accès au paramètre de mélange sin(2θ13)2, où θ13 est le dernier angle de la matrice MNSP finalement déterminé en 2012 conjointement par Daya Bay, RENO et Double Chooz. Pour déterminer la présence des ντ dans le faisceau, le détecteur OPERA est composé de cibles calorimétriques utilisant une alternance de plaques de plomb et de films d'émulsion. Ceux-ci permettront de reconstruire les traces des particules chargées résultant des interactions neutrino avec une précision inégalable (de l'ordre du micron). La recherche des événements de signal d'oscillation νµ → νe sera basée sur l'aptitude à identifier les électrons, à rejeter les événements de fond où un π0 est produit et à soustraire le fond dominant intrinsèque provenant du faisceau. Ce travail de thèse a pour objectif l'élaboration de méthodes d'analyse pour améliorer les performances du détecteur OPERA dans la recherche d'oscillations νµ → νe .</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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