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Neaume, Christine. "Recherche de la production directe de Q⁰ dans des collisions hadroniques π ⁻ N à 300 GeV/c et recherche de glueballs par ce même mécanisme". Paris 11, 1987. http://www.theses.fr/1987PA112034.
Pełny tekst źródłaCarrier, Kevin. "Recherche de presque-collisions pour le décodage et la reconnaissance de codes correcteurs". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS281.
Pełny tekst źródłaError correcting codes are tools whose initial function is to correct errors caused by imperfect communication channels. In a non-cooperative context, there is the problem of identifying unknown codes based solely on knowledge of noisy codewords. This problem can be difficult for certain code families, in particular LDPC codes which are very common in modern telecommunication systems. In this thesis, we propose new techniques to more easily recognize these codes. At the end of the 1970s, McEliece had the idea of redirecting the original function of codes to use in ciphers; thus initiating a family of cryptographic solutions which is an alternative to those based on number theory problems. One of the advantages of code-based cryptography is that it seems to withstand the quantum computing paradigm; notably thanks to the robustness of the generic decoding problem. The latter has been thoroughly studied for more than 60 years. The latest improvements all rely on using algorithms for finding pairs of points that are close to each other in a list. This is the so called near-collisions search problem. In this thesis, we improve the generic decoding by asking in particular for a new way to find close pairs. To do this, we use list decoding of Arikan's polar codes to build new fuzzy hashing functions. In this manuscript, we also deal with the search for pairs of far points. Our solution can be used to improve decoding over long distances. This new type of decoding finds very recent applications in certain signature models
Kabtoul, Mohammad. "Recherche d'effets d'isospin dans les collisions d'ions lourds 136,124Xe + 124,112Sn à 32 A. MeV". Caen, 2013. http://www.theses.fr/2013CAEN2073.
Pełny tekst źródłaThe INDRA multi-detector was exploited to study heavy ion collisions at Fermi energies in order to explore the so-called symmetry energy, which is the isospin dependence of the nuclear matter Equation of State. Our study has first focused on new data analysis techniques in order to select quasi-projectile sources compatible with a statistical de-excitation (“Sel” variable) and to sort quasi-fusion events and quasi-projectile/quasi-target events (variable “Vbigiso”). This first step was obtained with data from Xe+Sn and Au+Au reactions at different bombarding energies, specifically studying fragments and particles detected on the forward side of the reaction centre-of-mass. By analyzing the centre-of-mass forward light charged particles and fragments (Z>2) production in the reactions 136,124Xe+124,112Sn at 32 MeV/nucleon, corresponding to the fifth INDRA campaign at GANIL, we have confirmed the presence of isospin diffusion between projectile and target. We have shown that the magnitude of the diffusion increases with the collision violence, corresponding to increasing centrality. The experimental results were compared to theoretical predictions using both a phenomenological event generator, and the BNV/SMF transport model. A new variable is proposed to estimate the density dependence of the symmetry energy at sub-saturation densities. The first comparison with the BNV/SMF model shows that the Asy-stiff equation of state appears compatible with our data. The INDRA multi-detector was exploited to study heavy ion collisions at Fermi energies in order to explore the so-called symmetry energy, which is the isospin dependence of the nuclear matter Equation of State. Our study has first focused on new data analysis techniques in order to select quasi-projectile sources compatible with a statistical de-excitation (“Sel” variable) and to sort quasi-fusion events and quasi-projectile/quasi-target events (variable “Vbigiso”). This first step was obtained with data from Xe+Sn and Au+Au reactions at different bombarding energies, specifically studying fragments and particles detected on the forward side of the reaction centre-of-mass. By analyzing the centre-of-mass forward light charged particles and fragments (Z>2) production in the reactions 136,124Xe+124,112Sn at 32 MeV/nucleon, corresponding to the fifth INDRA campaign at GANIL, we have confirmed the presence of isospin diffusion between projectile and target. We have shown that the magnitude of the diffusion increases with the collision violence, corresponding to increasing centrality. The experimental results were compared to theoretical predictions using both a phenomenological event generator, and the BNV/SMF transport model. A new variable is proposed to estimate the density dependence of the symmetry energy at sub-saturation densities. The first comparison with the BNV/SMF model shows that the Asy-stiff equation of state appears compatible with our data
Neaume, Christine. "Recherche de la production directe de p °dans des collisions hadroniques pi ̄N à 300 GeV/c et recherche de glueballs par ce même mécanisme". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376084112.
Pełny tekst źródłaGeromitsos, Artemios. "Études du charme ouvert dans l'expérience STAR auprès du collisionneur RHIC dans les collisions p+p et A+A à √s NN =200 GeV". Nantes, 2010. http://www.theses.fr/2010NANT2027.
Pełny tekst źródłaOuaskit, Saïd. "Recherche d'effets de sillage sur la charge de fragments issus de la dissociation dans une feuille mince d'ions moléculaires rapides". Lyon 1, 1986. http://www.theses.fr/1986LYO10036.
Pełny tekst źródłaGolabek, Cédric. "A la recherche d'une signature de la formation et décroissance du système géant ”Z=184”". Phd thesis, Université de Caen, 2009. http://tel.archives-ouvertes.fr/tel-00416431.
Pełny tekst źródłaMoustabchir, Rachid. "Recherche d'une signature de phénomènes critiques et des effets dynamiques lors des collisions entre ions lourds aux énergies de Fermi". Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00008654.
Pełny tekst źródłaMoustabchir, Rachid Demeyer Albert Roy René. "Recherche d'une signature de phénomènes critiques et des effets dynamiques lors des collisions entre ions lourds aux énergies de Fermi". Villeurbanne : Université Claude Bernard, 2004. http://tel.archives-ouvertes.fr/docs/00/04/78/01/PDF/tel-00008654.pdf.
Pełny tekst źródłaThèse soutenue en co-tutelle. Titre provenant de l'écran titre. 113 réf. bibliogr.
Chasserat, Julien. "Recherche de leptoquarks de troisième génération dans l’expérience CMS au LHC". Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10033/document.
Pełny tekst źródłaInstalled on the LHC (Large Hadron Collider) ring, the CMS experiment (Compact Muon Solenoid) recorded a great amount of proton-proton collisions data from 2009 to 2012 at center of mass energies of 7 TeV and 8 TeV. This experiment was designed for precise measurements of the Standard Model parameters, for Higgs boson studies and to test theories beyond the standard model. Some of these theories foresee the existence of leptoquarks which are new bosons with couplings to both leptons and quarks. The first part of this thesis is dedicated to a presentation of the Standard Model and to a leptoquarks theoretical introducion. The second one briefly explains how the LHC and the CMS experiment work. The third part details the work accomplished during the first year of my thesis in the CMS generator group. Finaly, the last one deals with data analysis and the search of third generation leptoquarks pair production. Three LQ desintegration channels are investigated : to a top quark and a tau lepton, to a top quark and a neutrino and at last to a top quark and a muon. This study is based on the full integrated luminosity recorded during 2012, namely 19.7 fb. Various selections requiring at least one lepton and several jets are scrutinized in order to identify the regions with best signal efficiency regarding to Standard model backgrounds. Finally, a selection optimisation on discriminative variables is performed to extract the best 95 No significative excess with respect to Standard Model expectations was found. Thus we were able to set limits on the leptoquarks pair production cross sections. Third generation leptoquarks with masses below 320 GeV, 240 GeV and 910 GeV are excluded for the top tau, top nu and top mu channels, respectively
Charvet, Michael. "Recherche de l'apparition du phénomène de multifragmentation dans le système 32S+27Al". Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10065.
Pełny tekst źródłaBrochu, Frédéric. "Recherche de particules supersymétriques se désintégrant avec violation du nombre baryonique dans les collisions d'électrons et de positons produites dans le détecteur L3 au LEP". Chambéry, 2000. http://www.theses.fr/2000CHAMS008.
Pełny tekst źródłaTrimoska, Monika. "Combinatorics in algebraic and logical cryptanalysis". Electronic Thesis or Diss., Amiens, 2021. http://www.theses.fr/2021AMIE0005.
Pełny tekst źródłaIn this thesis, we explore the use of combinatorial techniques, such as graph-based algorithms and constraint satisfaction, in cryptanalysis. Our main focus is on the elliptic curve discrete logarithm problem. First, we tackle this problem in the case of elliptic curves defined over prime-degree binary extension fields, using the index calculus attack. A crucial step of this attack is solving the point decomposition problem, which consists in finding zeros of Semaev’s summation polynomials and can be reduced to the problem of solving a multivariate Boolean polynomial system. To this end, we encode the point decomposition problem as a logical formula and define it as an instance of the SAT problem. Then, we propose an original XOR-reasoning SAT solver, named WDSat, dedicated to this specific problem. As Semaev’s polynomials are symmetric, we extend the WDSat solver by adding a novel symmetry breaking technique that, in contrast to other symmetry breaking techniques, is not applied to the modelization or the choice of a factor base, but to the solving process. Experimental running times show that our SAT-based solving approach is significantly faster than current algebraic methods based on Gröbner basis computation. In addition, our solver outperforms other state-of-the-art SAT solvers, for this specific problem. Finally, we study the elliptic curve discrete logarithm problem in the general case. More specifically, we propose a new data structure for the Parallel Collision Search attack proposed by van Oorschot and Wiener, which has significant consequences on the memory and time complexity of this algorithm
Lavagne, Yves. "Recherche de nouveaux quarks lourds et de bosons scalaires entre 39,8 et 46, TGeV dans le système du centre de masse auprès de l'anneau de collisions". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375989981.
Pełny tekst źródłaFleuret, Frédéric. "Recherche du plasma de quarks et de gluons par l'étude des mésons Jpsi et Jpsi’ dans les collisions d'ions Pb et de protons ultrarelativistes sur divers noyaux". Palaiseau, Ecole polytechnique, 1997. http://www.theses.fr/1997EPXX0015.
Pełny tekst źródłaPROT, NICOLAS. "Caracteristiques d'evenements multicorps issus de collisions ar+au a 30 et 60 mev par nucleon. Methode d'analyse appliquee a la recherche de la multiplicite de particules legeres chargees". Caen, 1993. http://www.theses.fr/1993CAEN2025.
Pełny tekst źródłaSchneider, Mireille. "Recherche d'événements contenant un lepton isolé et de l'impulsion transverse manquante sur le collisionneur HERA avec le détecteur H1". Phd thesis, Université Louis Pasteur - Strasbourg I, 2003. http://tel.archives-ouvertes.fr/tel-00003176.
Pełny tekst źródłaCette thèse est consacrée à la recherche d'événements présentant cette topologie en étendant l'espace de phase aux événements de basse impulsion transverse manquante et à l'ensemble des données H1 de HERA-1 (118.3 pb-1) afin d'améliorer la sensibilité au signal et la précision statistique. Les résultats de cette analyse ont montré la persistance d'un excès d'événements à grande impulsion transverse manquante du système hadronique. L'étude du canal hadronique de désintégration du W ne montre aucun excès de données mais sa sensibilité au signal est insuffisante pour contredire l'excès observé dans le canal leptonique.
Une interprétation possible de cet excès dans un contexte au-delà du Modèle Standard est la production anormale de quark top. La recherche de ce processus a été effectuée dans le cadre de cette thèse à partir d'une analyse classique en coupures et d'une méthode multivariable de maximum de vraisemblance. Les résultats, semblables pour les deux méthodes, montrent que certains des candidats observés sont compatibles avec la production anormale de quark top. Le canal hadronique de recherche du top ne présente pas d'excès de données mais sa sensibilité au signal ne permet toujours pas de contredire l'excès du canal leptonique.
La précision statistique de l'excès observé n'est pas suffisante pour conclure sur la présence de nouvelle physique et des limites sur le couplage anormal au vertex t u gamma ont pu être déduites.
Lavagne, Yves. "Recherche de nouveaux quarks lourds et de bosons scalaires entre 39,8 et 46,7 GeV dans le système du centre de masse auprès de l'anneau de collisions e⁺e ⁻PETRA". Paris 11, 1986. http://www.theses.fr/1986PA112250.
Pełny tekst źródłaBeauceron, Stéphanie. "Recherche du boson de Higgs dans le canal WH et étude de la production Wbb̃͏ dans les collisions pp̄ à 1. 96 TeV dans l'expérience DØ auprès du Tevatron de Fermilab". Paris 6, 2004. http://www.theses.fr/2004PA066364.
Pełny tekst źródłaChanon, Nicolas. "Observation des photons directs dans les premières données et préparation à la recherche du boson de Higgs dans l'expérience CMS au LHC (CERN)". Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00598989.
Pełny tekst źródłaBeauceron, Stéphanie. "Recherche du boson de Higgs dans le canal $WH$ et étude de la production $Wb\bar{b}$ dans les collisions $p\bar{p}$ à 1.96 TeV dans l'expérience $D0$ auprès du Tevatron de Fermilab". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00106136.
Pełny tekst źródłaL'étude du processus $W (\to e\nu)b\bar{b}$ qui est un bruit de fond irréductible du signal de boson de Higgs a été réalisée avec 174 pb$^{-1}$ de données. Elle a permis d'établir une limite supérieure sur sa section efficace de production de 20.3 pb. Cette étude a été suivie par une recherche d'un signal de boson de Higgs pour des masses comprises entre 105 GeV et 135 GeV. Des limites sur les sections efficaces de production multipliées par les rapports d'embranchement de désintégrations ont été obtenues. Pour une masse de boson de Higgs de 115 GeV, nous obtenons une limite supérieure de 12.4 pb.
Guilbaud, Maxime. "Étude de la densité de particules chargées et des mésons vecteurs de basses masses en collisions Pb-Pb à sqrt(s)NN = 2.76 TeV dans ALICE au LHC". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10178/document.
Pełny tekst źródłaThe matter is composed of hadrons of which quarks and gluons are the elementary components. These do not exist in a free state in ordinary matter and are therefore permanently confined in hadrons. However, according to theoretical predictions, a few microseconds after the Big Bang, the temperature was high enough to create a deconfined state of quarks and hadrons : the Quark and Gluon Plasma (QGP). The Large Hadron Collider (LHC) at CERN (Geneva) is a particle accelerator which accelerates, among others, ions and produces collisions with energies per nucleons in the center of mass up to several TeraelectronVolts. It is thus possible to achieve temperatures to recreate the QGP phase to study its properties. The experiment ALICE (A Large Ion Collider Experiment) is dedicated to the study of such ultra-relativistic heavy-ion collisions. The lifetime of the QGP being too low, it is not possible to study it directly. It is then necessary to use indirect observables. This PhD work is directly related to the study of heavy-ion collisions at 2.76 TeV. Two observables are discussed : the density of charged particles per unit of pseudorapidity and low mass vector mesons (rho, omega and phi) in the dimuon channel. The first observable gives access to informations about the initial conditions and the underlying dynamics of particle production mechanisms. The measurement is performed in the largest pseudorapidity range reached at the LHC (10 units) thanks to the development of an original analysis method called " displaced vertex technique ". The technique employed and the results obtained are described in Chapter 3. The study of low mass vector mesons allows to probe the production of strangeness via the phi meson and chiral symmetry through the ! spectral function modification. The analysis was conducted using the ALICE muon spectrometer and the results obtained from the production rate of the phi with respect to rho and omega are shown in Chapter 4. In this chapter, a study on the sensitivity of the detector to the effects related to the chiral symmetry restoration is also conducted
Buchet, Philippe. "Competition entre emissions dynamique et statistique de particules dans les reactions 3 6 1 8ar + 5 8 2 8ni. Recherche d'un signal de phenomene critique dans les collisions centrales de 1 2 9 5 4xe + n a t 5 0sn". Caen, 1999. http://www.theses.fr/1999CAEN2037.
Pełny tekst źródłaCamincher, Clément. "Calorimétrie à argon liquide et recherche de nouvelle physique via l'étude de paires de quarks top boostés dans l'expérience ATLAS au LHC". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY065/document.
Pełny tekst źródłaThe standard model of particle physics is a very predictive theory, but it still fails to explain some observations and so leads to the idea of the existence of new physics. To discover it experimentally, the ATLAS collaboration analyses the proton-proton collisions provided by the LHC.Analyses need data of good quality. Hence, the first part of this document describes a work to characterize the coherent noise bursts observed in the liquid argon calorimeters of the ATLAS experiment. Such noise has been studied and cured to ensure a high level of data quality.The second part of this thesis takes place in the context of a new physics search using top quark pairs. This study is focused on the case where boosted top quarks decay electronically. The reconstruction of top quarks in such cases was never optimized by the ATLAS collaboration. Therefore this study has lead to the definition and implementation of a new method called "electron-in-jet removal" improving significantly the top quark reconstruction in such topologies.This new method gives access to electrons that were previously removed. The correction factor applied to correct the imperfections of the simulation should then be computed for those electrons. Some preliminary measurements have been performed for the cases where the electron is within a jet. Two methods are presented as well as thoughts about future implementations
Tschudi, Yohann. "Reconstruction de muons cosmiques en collision et recherche de gluinos se désintégrant en stop-top dans l'expérience CMS au LHC". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00640000.
Pełny tekst źródłaTschudi, Yohann. "Reconstruction de muons cosmiques en collision et recherche de gluinos se désintégrant en stop-top dans l’expérience CMS au LHC". Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10152/document.
Pełny tekst źródłaThe CMS experiment (Compact Muon Solenoid), built on the ring of the LHC (Large Hadron Collider), is recording data from proton-proton collisions for 2 years now. The alignment between all layers of the tracker, the sub-detector of CMS allowing the reconstruction and the measurement of the momentum of charged particles, is made by using tracks of particles created during collisions and tracks created by the passage of cosmic muons through this sub-detector. A first part of the presentation will be dedicated to the reconstruction of the tracks of these cosmic muons during collisions. A new method, called regional cosmic reconstruction, was developed and implemented. The 69 % efficiency and the fake rate around 1 % allow to use these tracks for the alignment. The second part, dedicated to the analysis of collision data, will concern the search of particles predicted by a model of extension of the Standard Model, the Supersymmetry, in a particular scenario, the light Stop scenario. In the case of a strong mixing in the third generation of squarks, the stop, supersymmetric partner of the top quark, could be light. In the analysis developped during this thesis, we were interested in the case where the mstop < mtop. In the MSSM with R-parity conservation, the gluino would be created by pair and would decay in a stop squark and a top quark. Stop would decays in a c quark and a neutralino, the lightest supereymmetric particle of the model, stable and interacting weakly. No excess with regards to Standard Model predictions was observed in 40pb-1 of data recorded by CMS in 2010. The limits obtained at 95 % confidence level allow to exclude masses of stop until 175 GeV for masses of gluinos going up to 350 GeV and low differences of masses between stop and neutralino
Bondu, Olivier. "Étude des désintégrations radiatives Z →μμγ et recherches du boson de Higgs dans le canal H→γγ dans l’expérience CMS au LHC (CERN)". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10198/document.
Pełny tekst źródłaThe Large Hadron Collider (LHC) at CERN (European Organisation for Nuclear Research) has been in operation since 2009 at the border between France and Switzerland. This particle accelerator has provided a significant quantity of proton-proton collisions, at center of mass energies of 7 TeV (2010 and 2011) and 8 TeV (since April 2012). One of the purposes of the Compact Muon Solenoid (CMS) experiment, which records and analyses those collisions, is the search for Higgs bosons. In the Standard Model, this particle would be the quantum of the Higgs field, thought to explain the electroweak symmetry-breaking mechanism. One of the most sensitive channels for the search for a light Higgs boson (i.e. for masses between 90 GeV=c2 and 150 GeV=c2) at the LHC is through its decay into two photons. Indeed, the production of two highly energetic and isolated photons in the final state is a clean signal in hadronic collisions, despite the small branching ratio. Moreover, at these masses, the width of the reconstructed invariant mass peak is dominated by the detector resolution. Hence, a precise understanding of the photon object as reconstructed by the experiment is required. The first part of the work presented here is the study of radiative decays Z$^0 \rightarrow \mu\mu\gamma$ these decays are the only Standard Model source of high purity certified photons, for which the transverse momentum of the photon is relatively similar to the one of the photons coming from a Higgs boson decay. The study of these decays enables the determination of the differential photon energy scale in the 7 TeV data. These decays have also been used in the 8 TeV data as a validation tool of photon cluster shape variables in the simulation, and also as a way to determine the electron rejection criteria efficiency. The second part of the work concerns the search for a Higgs boson decaying into two photons. This search is done in several event classes in order to increase the sensitivity of the analysis, the study of the class separation procedure is presented. Finally, a benchmark study for the search for a Higgs boson decaying into two photons via vector-like top-partner decays at 14 TeV has been performed
Gobet, Franck. "Fragmentation de molécules et d'agrégats moléculaires induite par collision avec un atome à haute vitesse (vitesse relative de l'ordre de c/100)". Phd thesis, Université Claude Bernard - Lyon I, 2001. http://tel.archives-ouvertes.fr/tel-00001427.
Pełny tekst źródłaBondu, Olivier. "Etude des désintégrations radiatives Z$^0 \rightarrow \mu\mu\gamma$ et recherches du boson de Higgs dans le canal H$\rightarrow \gamma\gamma$ dans l'expérience CMS au LHC (CERN)". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00914252.
Pełny tekst źródłaTeyssier, Boris. "Étude de la production de méson neutre léger dans la voie de désintégration dimuonique en collision proton-proton à sqrt(s) = 13 TeV en rapidité vers l'avant dans ALICE au LHC du CERN". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1240/document.
Pełny tekst źródłaThe ordinary matter surrounding us is made of hadrons which in turn are composed of quarks and gluons. These latter are elementary constituents which cannot be observed in a free state. However it is at present recognized that this matter confined within hadrons can undergo, under extreme conditions of high temperature and/or highnet baryonic density, a transition to a state of deconfined quarks and gluons whichcalled quark gluon plasma. The conditions required to form this quark gluon plasma can be experimentallyachieved using a machine capable of colliding nuclei at very high energies: this is particularly the case at CERN where is located the world’s largest and most powerful particle accelerator, the Large Hadron Collider, which collided Pb ions at a center-of-mass energy of 2.76 to 5.02 TeV per nucleon pair and protons of 0.9 to 13 TeV. Pb-Pb collisionssuch relativistic energies definitely allow for the suitable density conditions to form the quark gluon plasma phase. This thesis work contributes to this physics program by studying the production of neutral light mesons in collisions of proton-proton at 13 TeV, which provides the necessary reference to understand further observations done in Pb-Pb collisions. This study has been performed in the dimuon decay channel by analyzing the dimuon invariant mass spectrum in the region of masses lower than 1.5 GeV/c2 , giving accessthe measurement of the cross sections of eta, rho/omega and phi mesons
Brochu, Frédéric. "Recherche de particules supersymetriques se desintegrant avec violation du nombre baryonique dans les collisions e+e- produites dans le detecteur L3 a LEP". Phd thesis, 2000. http://tel.archives-ouvertes.fr/tel-00001061.
Pełny tekst źródłaRp, toutes deux possibles dans le cadre du Modèle Standard Supersymétrique Minimal (MSSM).
Cette simple supposition conduit à des signatures de désintégration de particules
supersymétriques radicalement différentes des signatures étudiées jusqu'à présent et
ouvre des perspectives inattendues à la recherche de supersymétrie.
Nous développerons tout au long de cet ouvrage les conséquences phénoménologiques de
cette hypothèse, les signatures expérimentales possibles dans des collisions e+e- et la
mise en place d'un protocole d'analyse visant à isoler celles-ci dans les données collectées
entre 1997 et 2000 par l'expérience L3 installée auprès du collisionneur LEP.
Les résultats obtenus ainsi que leur interprétation dans le cadre du MSSM contraint
seront également détaillés.
A titre de validation des méthodes de recherche développées, une mesure de la section
efficace du processus e+e- -> ZZ -> q qbar q' q'bar, a été également effectuée.