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Tesi sul tema "Baryons"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Urlichs, Konrad. "Baryons and baryonic matter in four-fermion interaction models." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983572755.

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2

Ouared, Mohamed Rafik. "Étude des propriétés de production et de désintégration du baryon charme lambda C dans les interactions PP à 400 GeV/c." Paris 11, 1987. http://www.theses.fr/1987PA112191.

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3

Haupt, Christian. "Electromagnetic properties of baryons." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980373271.

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4

Drach, Vincent. "Fermions twistés dynamiques et spectroscopie des baryons." Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENY015.

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Ce travail s'intéresse au calcul de la masse des baryons à partir de la théorie décrivant l'interaction forte : la chromodynamique quantique (QCD). Cette théorie régit l'interaction entre les quarks et l es gluons et a pu durant ces dernières décennies être vérifiée à haute énergie grâce à l'une de ses propriétés : la liberté asymptoti que. Celle-ci prédit que les calculs perturbatifs sont valides à haute énergie car la constante de couplage tend vers zéro. Les quantités physiques régissant la physique à basse énergie nécessitent quant à elles un traitement non pertubatif et font l'objet de ce

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5

Drach, Vincent. "Fermions twistés dynamiques et spectroscopie des baryons." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00633497.

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Ce travail s'intéresse au calcul de la masse des baryons à partir de la théorie décrivant l'interaction forte : la chromodynamique quantique (QCD). Cette théorie régit l'interaction entre les quarks et l es gluons et a pu durant ces dernières décennies être vérifiée à haute énergie grâce à l'une de ses propriétés : la liberté asymptoti que. Celle-ci prédit que les calculs perturbatifs sont valides à haute énergie car la constante de couplage tend vers zéro. Les quantités physiques régissant la physique à basse énergie nécessitent quant à elles un traitement non pertubatif et font l'objet de ce

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6

Habibi, Farhang. "Searching for missing baryons through scintillation." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00625486.

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Cool molecular hydrogen H2 may be the ultimate possible constituent to the Milky-Way missing baryon. We describe a new way to search for such transparent matter in the Galactic disc and halo, through the diffractive and refractive effects on the light of background stars. By simulating the phase delay induced by a turbulent medium, we computed the corresponding illumination pattern on the earth for an extended source and a given passband. We show that in favorable cases, the light of a background star can be subjected to stochastic fluctuations of the order of a few percent at a characteristic

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7

Avenarius, Christoph. "The spin structure of the baryons." Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:448e060b-085d-449f-b33a-dd3913093d6d.

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Baryons are considered in the Nonrelativistic Quark Model (NQM) to be bound states of three valence quarks. Each quark has two possible spin eigenstates in the restframe of the baryon whose spin is fully carried by quarks. The baryon wavefunctions are connected through SU(6) symmetry rotations. For a long time, the measured magnetic moments of the baryons appeared to be in agreement with the NQM predictions. However, recent experiments which are examining the spin structure of the baryons show the failure of several NQM predictions. The so-called 'spin crisis' arose from the interpretation of

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8

MERLI, ANDREA. "SEARCH FOR CP VIOLATION IN BARYONS." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/656029.

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In the past, flavour physics has driven indirect discoveries of new particles through precision measurements of other processes before the actual particles could be produced directly. For example the discovery of the differences in the behaviour of matter and antimatter, CP violation (CPV), has led to the explanation of flavour mixing with three families of quarks; the absence of the decay{KL}{mumu} decay drove the prediction of the cquark quark trough the GIM mechanism; the measurement of the Bd mixing allowed for the prediction of high mass of the quark quark. The asymmetry between matter

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9

Niemiec, Anna. "Influence of the environment on galaxy formation." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0260/document.

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Dans le modèle de formation hiérarchique des structures, les amas de galaxies se forment et grandissent par l'accrétion de groupes plus petits ou de galaxies isolées. Dans ce scenario, comprendre comment les galaxies accrétées interagissent avec cet environnement très dense est une étape importante pour comprendre le schéma global de l'évolution des galaxies et de la formation des structures. En effet, pendant leur chute au coeur de l'amas, les galaxies sont sujettes à diverses interactions avec l'amas hôte, au niveau de leur composante baryonique aussi bien que matière noire, et ces interacti

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10

Knippschild, Bastian [Verfasser]. "Baryons in the chiral regime / Bastian Knippschild." Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1020765712/34.

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11

Yamato, Shinichiro. "Static properties of baryons in holographic QCD." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124420.

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12

Elliot-Ripley, Matthew Kevin Ian David. "Baryons, salt and popcorn in holographic QCD." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12156/.

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The Sakai-Sugimoto model is the leading model of holographic QCD. It has an effective five-dimensional description in which baryons correspond to the bulk topological solitons of a Yang-Mills-Chern-Simons theory. However, the large dimensionality of the model means studying soliton solutions either analytically or numerically is difficult. Sakai-Sugimoto solitons in the high density limit should provide an analogue of cold, dense QCD. Two competing theories for high-density solutions are the dyon salt model, in which the appropriate crystal is a salt-like arrangement of dyons, and the baryonic

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13

Rasera, Yann. "L'histoire cosmique des baryons dans un univers hierarchique." Phd thesis, Université Paris-Diderot - Paris VII, 2005. http://tel.archives-ouvertes.fr/tel-00070844.

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Durant cette these, j'ai etudie la formation des galaxies grace a des simulations cosmologiques et a un nouveau modele analytique. Dans le cadre du modele standard de formation hierachique des grandes structures, les petites fluctuations primordiales de densite observees sur le fond diffus cosmologique sont amplifiees par la gravite pour donner des halos de matiere noire de plus en plus gros. C'est au sein de ces halos que le gaz s'effondre et se refroidit pour former des disques de gaz froid a support centrifuge. Ces disques sont ensuite convertis en disques stellaires : les galaxies. Le prob

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14

Ohlsson, Tommy. "Properties of baryons in the chiral quark model." Licentiate thesis, KTH, Fysik, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-756.

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In this thesis, several properties of baryons are studied using the chiral quark model. The chiral quark model is a theory which can be used to describe low energy phenomena of baryons. In Paper 1, the chiral quark model is studied using wave functions with configuration mixing. This study is motivated by the fact that the chiral quark model cannot otherwise break the Coleman–Glashow sum-rule for the magnetic moments of the octet baryons, which is xperimentally broken by about ten standard deviations. Configuration mixing with quark-diquark components is also able to reproduce the octet baryon

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15

Powell, Leila Catherine. "Baryons in hierarchical structure formation : substructure and accretion." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532005.

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16

Cahill, Mark D. "An extension of the Skyrme model of baryons." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329094.

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17

McGovern, J. A. "Strange baryons in a chiral quark-meson model." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233064.

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18

Blanckenberg, Jacobus Petrus. "Skyrme model description of heavy baryons with strangeness." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96953.

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19

McEwen, Joseph Eugene McEwen. "The Hidden Universe: Dark Energy, Dark Matter, Baryons." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471877488.

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20

Rasera, Yann. "L'histoire cosmique des baryons dans un univers hiérarchique." Paris 7, 2005. https://tel.archives-ouvertes.fr/tel-00070844.

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21

Helminen, Christina. "Aspects of the quark model for the baryons." Helsinki : University of Helsinki, 2000. http://ethesis.helsinki.fi/julkaisut/mat/fysii/vk/helminen/.

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22

Oettel, Martin. "Baryons as relativistic bound states of quark and diquark." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96321604X.

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23

Lindebaum, R. J. "The anomalous magnetic moment of baryons in cavity QCD." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/17387.

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Bibliography: pages 86-87.<br>Using a generalised form of the Gell-Mann and Low theorem, all the diagrams in cavity QCD to order as that contribute to the magnetic moment are calculated. The calculations are performed for massive quarks so a mass renormalisation scheme has been developed to cope with the new divergences this brings into the self-energy insert diagrams. The results of this work show that no improvement on the simple SU(3) model is made by including these corrections. These calculations point to a smaller value of αs than that which is usually used.

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24

Ogilvy, Stephen. "Branching ratios of charmed baryons in the LHCb experiment." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6463/.

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LHCb is the dedicated heavy flavour experiment on the LHC accelerator ring. An analysis measuring the relative branching fractions of Lc->phh decays is presented using 1 inverse femtobarn of proton - proton collisions gathered by LHCb during 2011. Independent measurements are made using samples of Lc produced from the primary interaction and from those produced in semileptonic decays of Lb baryons. The measured relative branching ratios in the prompt analysis are B(Lc->pK-K+)/B(Lc->pK-pi+) = (2.03 ± 0.07 (stat) ± 0.10 (syst)) × 10−2, and B(Lc->ppi-pi+)/B(Lc->pK-pi+) = (7.04±0.19(stat)±0.34(sys

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25

Wicker, Raphaël. "Baryons in galaxy clusters : astrophysical effects and cosmological constraints." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP114.

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Les amas de galaxies sont les objets gravitationnellement liés les plus massifs de l'univers, et l'histoire de leur formation est une conséquence directe de l'évolution des structures dans l'univers. Ainsi, leur étude permet de poser des contraintes cosmologiques. L'utilisation des amas en tant que sondes cosmologiques repose sur l'observation de leur contenu en matière, en particulier ordinaire, ou baryons. Ces derniers sont présents sous forme d'étoiles contenues dans les galaxies, et de gaz au sein du milieu intra-amas. Toutefois, les baryons dans les amas de galaxies sont sujets à des effe

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26

Benson, Kevin E. C. "Aspects of the electroweak phase transition and baryogenesis." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:27c64513-bbb7-4f94-b385-4e691354a7b5.

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In this thesis we study aspects of the cosmological electroweak phase transition which are relevant to the possibility of baryogenesis at this epoch. We focus on two issues: first, requiring that the observed baryon number be of electroweak origin places strong constraints on electroweak physics, and second, baryogenesis at the electroweak scale may be driven by an asymmetry generated at the GUT scale. We use the effective potential at finite temperature as a means of analyzing phase transitions associated with spontaneous symmetry breaking. We develop the theory with two basic examples: the s

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27

Plaszczynski, Stéphane. "Etude de la production des hyperons a lep (delphi) et recherche de baryons beaux etranges." Paris 7, 1994. http://www.theses.fr/1994PA077178.

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A partir de l'analyse des donnees enregistrees a lep avec le detecteur delphi en 1991-1992-1993, un signal de baryons beaux etranges est obtenu par l'etude des correlations de charge entre un hyperon xi et un lepton d'un meme jet. Les diverses sources conduisant a cet etat final sont etudiees. La probabilite que ce signal soit issu de fluctuations d'autres sources que des baryons beaux est estimee a 10#-#4. Une evaluation de la duree de vie des baryons beaux etranges est effectuee. Les taux de production inclusifs de plusieurs hyperons sont egalement mesures

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28

Yip, Matthew Wing Yu. "Rare decays of heavy baryons using soft collinear effective theory." Thesis, Durham University, 2013. http://etheses.dur.ac.uk/7758/.

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In the era of high-luminosity hadronic colliders, the rare heavy-to-light decay Lambda_b to Lambda l+ l- receives increasing research attention in both experimental and theoretical particle phenomenology. This flavour-changing neutral-current decay is a potential window for the discovery of new Physics beyond the Standard Model through its helicity-sensitive nature, complementing past and ongoing searches and calculations related to the B meson. In this work the universal soft form factor in the heavy-quark and large-recoil limits is calculated using light-cone sum rules in the framework of so

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29

Ferlito, Fulvio. "Structure formation simulations with scattering between dark energy and baryons." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23855/.

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Abstract (sommario):

Our Universe is full of unknowns, among them one of the most mysterious is, no doubt, dark energy (DE), the entity responsible for cosmic acceleration. We still do not even know its intrinsic nature, and in investigating its properties we can not exclude the possibility of an interaction between DE and the other components of the Universe. In recent times, a new class of interacting DE models have been proposed in the literature. These assume that the interaction between DE and matter could be well approximated by a pure momentum exchange. The efficiency of the process is then described by

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30

Chai, Xuedong. "Exclusive B decays into final states with two charmed baryons." Diss., University of Iowa, 2007. http://ir.uiowa.edu/etd/126.

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31

Holmberg, Måns. "Detemining low-energy constants in PTfrom decays of decuplet baryons." Thesis, Uppsala universitet, Kärnfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-397766.

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32

Zanotti, James Michael. "Baryon spectroscopy with FLIC fermions." Title page, abstract and table of contents only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phz33.pdf.

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"October 2002" Bibliography: p. 129-136. 1. Introduction -- 2. QCD and the standard model -- 3. The Lattice -- 4. Symanzik improvement in the Static Quark Potential -- 5. Scale determination for an improved Gluon Action -- 6. Fat-link Irrelevant Clover Fermion actions -- 7. Excited Baryons in Lattice QCD -- 8. Spin 3/2 Baryons -- 9. Conclusion. This thesis reports work done in conducting numerical simulations of Lattice QCD.

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33

Mattson, Mark Edward. "Inclusive hadron production in electron-positron collisions with center-of-mass energies from 50 to 61.4 GeV." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09192008-063028/.

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34

Vargas, Magana Mariana. "Large Scale Structure with SDSS III- BOSS." Paris 7, 2012. http://www.theses.fr/2012PA077043.

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Le travail de ma thèse s'est concentré sur l'extraction du signal laissé par les BAO dans la distribution des galaxies. Celui se présente sous forme d'un pic autour de 150 Mpc dans la fonction de corrélation à deux point de la matière. Cette échelle correspond à la distance parcourue par l'onde acoustique dans le fluide matière-radiation entre la période d'égalité matière-radiation et leur découplage à z-1100. Il en résulte une sur-densité à cette échelle autour de chaque perturbation primordiale. Le but de mon travail était d'effectuer une analyse complète sur les données prises par la collab

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35

Dentin, Serge. "Contribution à l'étude du secteur baryonique dans la théorie des perturbations chirales." Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX22077.

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Le lagrangien fondamental des interactions fortes (chromodynamique quantique, ou qcd) est invariant, quand les masses des quarks sont nulles, sous l'action d'un groupe de symetrie su(3)su(3) (groupe chiral) agissant dans l'espace des saveurs. Cette symetrie est spontanement brisee, laissant place a huit bosons de nambu-goldstone sans masse: les mesons pseudoscalaires de l'octet de su(3). La theorie des perturbations chirales (cpt) offre la possibilite d'une description a basses energies des etats hadroniques les plus legers: par rapport aux echelles typiques d'energie mises en jeu dans ces pro

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36

Conte, Eric. "Recherche de la violation des symétries CP et T dans les réactions Lambda0_b -> Lambda 0 + un méson vecteur. Validation de l'architecture de lecture des canaux du détecteur de pied de gerbe de l'expérience LHCb." Clermont-Ferrand 2, 2007. http://www.theses.fr/2007CLF21785.

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Cette thèse explore la physique des baryons beaux dans le cadre de l'expérience LHCb. L'axe de recherche considéré porte sur les désintégrations lambda0b en lambda0 V avec V un méson vecteur tel que J/psi (µ+ µ-), phi (K+K-), oméga (pi+pi-pi0) ou encore le mélange rhô0 _ oméga0 (pi+pi-). Ces processus offrent la possibilité de tester la symétrie CP, dans un secteur (celui des baryons) où aucune violation n'a été observée, et la symétrie T, dont les preuves de sa violation sont limitées. Parmi les autres perspectives envisageables, une mesure précise du temps de vie du lambda0b pourrait contrib

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37

Ohlsson, Tommy. "Dynamics of quarks and leptons : theoretical Studies of Baryons and Neutrinos." Doctoral thesis, KTH, Fysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2991.

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The Standard Model of Elementary Particle Physics (SM) is the present theoryfor the elementary particles and their interactions and is a well-established theorywithin the physics community. The SM is a combination of Quantum Chromodynamics(QCD) and the Glashow{Weinberg{Salam (GWS) electroweak model. QCDis a theory for the strong force, whereas the GWS electroweak model is a theoryfor the weak and electromagnetic forces. This means that the SM describes allfundamental forces in Nature, except for the gravitational force. However, the SMis not a nal theory and some of its problems will be discus

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38

Berntzon, Lisa. "Studies of Heavy Baryons in DELPHI and Radiation Monitoring in DØ." Doctoral thesis, Stockholm : Fysikum, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-173.

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39

Sintes, Benjamin. "Etude des baryons avec le modèle de Nambu et Jona-Lasinio." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=f4575fbb-7004-4427-85e7-a7bc179c76aa.

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Durant cette thèse nous avons étudié la transition de phase entre la matière hadronique et le plasma de quark et de gluon en utilisant le modèle de Nambu et Jona-Lasinio. Ce modèle permet une description à basse énergie du processus d'hadronisation ayant lieu durant le refroidissement du plasma. Le lagrangien est basé sur les mêmes symétries que celui de QCD et a déjà montré de bons résultats pour les mésons. On souhaite ajouter les baryons afin de compléter cette description. Nous avons étudié les mésons et les diquarks en faisant appel au même formalisme, dans un premier temps à température

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40

Nawa, Kanabu. "Non-perturbative aspects of quantum chromodynamics for quarks, diquarks, and baryons." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136762.

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41

Gastineau, Fabrice. "La thermodynamique et la dynamique de la version étendue du modèle de Nambu-Jona-Lasinio." Nantes, 2002. http://www.theses.fr/2002NANT2041.

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Dans le cadre de cette thèse une étude détaillée des propriétés thermodynamique et dynamique du modèle de Nambu-Jona-Lasinio (NJL) a été élaborée. Ce modèle est une bonne approximation de la physique hadronique de basse énergie, autorisant l'étude de tous les phénomènes reliés à la transition de phase chirale. Il a en plus l'avantage d'être simple à manipuler permettant ainsi son extension à température et densité finies. Une premiȩ̀re partie concerne l'étude du diagramme des phases du modèle NJL, ainsi il est montré que la transition de phase chirale y est décrite de façon correcte. Une atten

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42

Rubin, Douglas Seth. "Properties of Dark Matter Halos and Novel Signatures of Baryons in Them." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11329.

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This thesis investigates the properties of dark matter halos and places constraints on the baryons within them by utilizing observational data. In Chapter 2, we use spherical collapse dynamics to calculate the non-linear over-density of a dark matter halo at virialization given realistic initial and final density profiles in an Einstein-de Sitter cosmology and cosmologies with matter, dark energy and possible curvature. We find that the non-linear over-density at virialization can be reduced by as much as a factor of 10 as compared to the standard value.<br>Physics

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43

Schaller, Matthieu. "Effects of baryons on the dark matter distribution in cosmological hydrodynamical simulations." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11275/.

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Simulations including solely dark matter performed over the last three decades have delivered an accurate and robust description of the cosmic web and dark matter structures. With the advent of more precise cosmological probes, planned and ongoing, and dark matter detection experiments, this numerical modelling has to be improved to incorporate the complex non-linear and energetic processes taking place during galaxy formation. We use the ``Evolution and Assembly of GaLaxies and their Environment'' (EAGLE) suite of cosmological simulations to investigate the effects of baryons and astrophysica

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44

Guillet, Thomas. "Effets des baryons sur les propriétés statistiques des grandes structures de l’Univers." Paris 11, 2010. http://www.theses.fr/2010PA112123.

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Les observations de lentilles faibles gravitationnelles sont en mesure de fournir des pistes quant à la nature de l'énergie noire et ses propriétés. Leur interprétation est rendue plus difficile par la physique des baryons qui modifie la distribution totale de matière à petite échelle. Mon travail s'est axé sur la détermination et la modélisation des effets des baryons sur les statistiques de la distribution de matière dans l'Univers. En mettant en oeuvre des simulations numériques, j'ai mesuré l'effet des baryons prédit par ces simulations sur le spectre en puissance, la variance et le troisi

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45

Fleck, Sonia. "Baryons à double charme et quelques autres aspects de la spectroscopie hadronique." Grenoble 1, 1988. http://www.theses.fr/1988GRE10102.

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46

Fleck, Sonia. "Baryons à double charme et quelques autres aspects de la spectroscopie hadronique." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376136390.

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47

Azizi, Kazem. "Properties Of Light And Heavy Baryons In Light Cone Qcd Sum Rules Formalism." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610468/index.pdf.

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Abstract (sommario):

In this thesis, we investigate the masses, form factors and magnetic dipole moments of some light octet, decuplet and heavy baryons containing a single heavy quark in the framework of the light cone QCD sum rules. The magnetic dipole moments can be measured considering radiative transitions within a multiplet or between multiplets. Analyzing the transitions among the baryons and calculating the above mentioned parameters can give us insight into the structure of those baryons. In analyzing the aforementioned processes, the transition form factors play a crucial role. In this thesis, the form f

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48

Ronniger, Michael [Verfasser]. "Spin and Flavour dependent Interactions within a Quark Model for Baryons / Michael Ronniger." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/104497110X/34.

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49

Mummery, B. O. "The role of baryons and neutrinos in the evolution of large-scale structure." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/9429/.

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Abstract (sommario):

Galaxy groups and clusters (GGCs) hold a privileged position within the cosmological hierarchy. As the most recent structures to have formed, their abundances, spatial distribution and individual properties bear the indelible imprint of the background cosmology, initial conditions and their formation history, making them valuable probes of both cosmology and astrophysics. It has, however, become increasingly clear over the past decade that making use of these probes for precision cluster cosmology requires detailed, realistic predictions for the observed properties of GGCs. Producing these nec

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50

Edwards, Adam Jacob. "A study of double-charm and charm-strange baryons in electron-positron annihilations /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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