Bibliografie tematiche / Baryonen

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Letteratura scientifica selezionata sul tema "Baryonen"

Autore: Grafiati
Pubblicato: 7 dicembre 2024

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Articoli di riviste sul tema "Baryonen"

1

LEDDIG, TORSTEN. "INVESTIGATION OF B-MESON DECAYS INTO BARYONS WITH THE BABAR DETECTOR". International Journal of Modern Physics A 26, n. 03n04 (10 febbraio 2011): 545–48. http://dx.doi.org/10.1142/s0217751x11051986.

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We report on investigations of B-meson decays into baryons with the BABAR detector. The comparison of different decay channels reveals that higher multiplicities are preferred for these decays. Furthermore, an enhancement in the invariant baryon-antibaryon mass distribution can be observed in several baryonic decay modes. In addition, the study of baryon resonances seen in baryonic B-meson decays is presented.
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Pardo Calderón, Leandro Manuel. "Baryon Acoustic Oscillations. Equation and physical interpretation". Scientia et Technica 23, n. 2 (30 giugno 2018): 263–68. http://dx.doi.org/10.22517/23447214.17251.

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Baryon Acoustic Oscillations are a phenomenon occurred before matter-radiation decoupling, characterized because the baryonic matter perturbation presents oscillations, as the name suggests. These perturbations propagate like a pressure wave on the photon-baryon fluid produced by gravitational potentials, which join the baryonic matter, and collisions of baryons and photons, which scatter it. This paper shows the Baryon Acoustic Oscillations equation and it provides its physical meaning. Besides, it presents software CAMB as a tool to find BAO equation solutions and support for its physical description.
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GARCIA-RECIO, C., L. L. SALCEDO, D. GAMERMANN, J. NIEVES, O. ROMANETS e L. TOLOS. "CHARMING BARYONS". International Journal of Modern Physics: Conference Series 26 (gennaio 2014): 1460124. http://dx.doi.org/10.1142/s2010194514601240.

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We study odd-parity baryonic resonances with one heavy and three light flavors, dynamically generated by meson-baryon interactions. Special attention is paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector mesons and baryons with Jπ = 1/2+ and 3/2+ are considered as constituent hadrons. For the hidden-charm sector ([Formula: see text]), the meson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal extension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such that not new parameters are needed. This interaction can be presented in different formal ways: as a Field Lagrangian, as Hadron creation-annihilation operators, as SU(6)×HQSS group projectors and as multichannel matrices. The multichannel Bethe-Salpeter equation is solved for odd-parity light baryons, hidden-charm N and Δ and Beauty Baryons (Λb). Results of calculations with this model are shown in comparison with other models and experimental values for baryonic resonances.
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Khan, Mehbub, Yun Hao e Jong-Ping Hsu. "Baryonic Force for Accelerated Cosmic Expansion and Generalized U1b Gauge Symmetry in Particle-Cosmology". EPJ Web of Conferences 168 (2018): 04004. http://dx.doi.org/10.1051/epjconf/201816804004.

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Based on baryon charge conservation and a generalized Yang-Mills symmetry for Abelian (and non-Abelian) groups, we discuss a new baryonic gauge field and its linear potential for two point-like baryon charges. The force between two point-like baryons is repulsive, extremely weak and independent of distance. However, for two extended baryonic systems, we have a dominant linear force α r. Thus, only in the later stage of the cosmic evolution, when two baryonic galaxies are separated by an extremely large distance, the new repulsive baryonic force can overcome the gravitational attractive force. Such a model provides a gauge-field-theoretic understanding of the late-time accelerated cosmic expansion. The baryonic force can be tested by measuring the accelerated Wu-Doppler frequency shifts of supernovae at different distances.
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HOSAKA, A., H. TOKI e M. TAKAYAMA. "BARYON SPECTRA IN DEFORMED OSCILLATOR QUARK MODEL". Modern Physics Letters A 13, n. 21 (10 luglio 1998): 1699–707. http://dx.doi.org/10.1142/s0217732398001777.

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We study theoretically the baryon spectra in terms of a deformed oscillator quark (DOQ) model. This model is motivated by confinement of quarks and chiral symmetry breaking, which are the most important nonperturbative phenomena of QCD. The minimization of the DOQ Hamiltonian with respect to the deformation for each principal quantum number results in deformations for the intrinsic states of excited baryonic states. We find that the resulting baryon spectra agree very well with the existing experimental data including SU(3) baryons. The spatial deformation of the baryonic excited states carry useful information on the quark confinement and provide a clue to understand the confining mechanism.
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Dominguez-Tenreiro, Rosa, e Gustavo Yepes. "On the Possibility of a Higher Baryonic Contribution to Dark Matter". Symposium - International Astronomical Union 130 (1988): 592. http://dx.doi.org/10.1017/s0074180900137180.

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The most stringent constraint against baryonic dark matter is provided by primordial nucleosynthesis. Agreement between theory and observations is reachedonly for a limited range of the baryon-to-photon ratio ‘LR, namely , which implies that, in standard cosmological frameworks, the universe cannot be closed by baryons.
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Kostyuk, Ivan, Robert Lilow e Matthias Bartelmann. "Baryon-photon interactions in Resummed Kinetic Field Theory". Journal of Cosmology and Astroparticle Physics 2023, n. 09 (1 settembre 2023): 032. http://dx.doi.org/10.1088/1475-7516/2023/09/032.

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Abstract We explore how interactions between baryons and photons can be incorporated into Kinetic Field Theory (KFT), a description of cosmic structure formation based on classical Hamiltonian particle dynamics. In KFT, baryons are described as effective mesoscopic particles which represent fluid elements governed by the hydrodynamic equations. In this paper, we modify the mesoscopic particle model to include pressure effects exerted on baryonic matter through interactions with photons. As a proof of concept, we use this extended mesoscopic model to describe the tightly coupled baryon-photon fluid between matter-radiation equality and recombination. We show that this model can qualitatively reproduce the formation of baryon-acoustic oscillations in the cosmological power spectrum.
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Martinsson, Thomas, Marc Verheijen, Matthew Bershady, Kyle Westfall, David Andersen e Rob Swaters. "Mass distributions in disk galaxies". Proceedings of the International Astronomical Union 11, S321 (marzo 2016): 283. http://dx.doi.org/10.1017/s1743921316011169.

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AbstractWe present results on luminous and dark matter mass distributions in disk galaxies from the DiskMass Survey. As expected for normal disk galaxies, stars dominate the baryonic mass budget in the inner region of the disk; however, at about four optical scale lengths (hR) the atomic gas starts to become the dominant contributor. Unexpectedly, we find the total baryon to dark-matter fraction within a galaxy stays nearly constant with radius from 1hR out to at least 6hR, with a baryon fraction of 15–50% among galaxies. On average, only one third of the mass within 2.2hR in a disk galaxy is baryonic and these baryons appear to have had only a minor effect on the distribution of the dark matter.
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Ghalenovi, Zahra. "Study of Heavy Strange Baryons in a Hypercentral Quark Model". International Journal of Modern Physics: Conference Series 46 (gennaio 2018): 1860037. http://dx.doi.org/10.1142/s2010194518600376.

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In this work, we study the properties of the heavy baryons with strangeness employing a constituent quark model in the hypercentral approach. The potential model considers the interactions arising the one-gluon exchange, Goldstone boson exchange and confinement, aspects of underlying theory, quantum chromodynamics (QCD). By solving three-body Schrodinger equation of baryonic system, we obtain the ground as well as the corresponding energy eigenvalues of the system. Using the obtained energies, we calculate the baryon spectrum. We extend our scheme to predict the radiative decay width of the charm baryons. A comparison of our results with those of other works and experimental data is also presented.
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Huang, Hung-Jin, Tim Eifler, Rachel Mandelbaum, Gary M. Bernstein, Anqi Chen, Ami Choi, Juan García-Bellido et al. "Dark energy survey year 1 results: Constraining baryonic physics in the Universe". Monthly Notices of the Royal Astronomical Society 502, n. 4 (15 febbraio 2021): 6010–31. http://dx.doi.org/10.1093/mnras/stab357.

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ABSTRACT Measurements of large-scale structure are interpreted using theoretical predictions for the matter distribution, including potential impacts of baryonic physics. We constrain the feedback strength of baryons jointly with cosmology using weak lensing and galaxy clustering observables (3 × 2pt) of Dark Energy Survey (DES) Year 1 data in combination with external information from baryon acoustic oscillations (BAO) and Planck cosmic microwave background polarization. Our baryon modelling is informed by a set of hydrodynamical simulations that span a variety of baryon scenarios; we span this space via a Principal Component (PC) analysis of the summary statistics extracted from these simulations. We show that at the level of DES Y1 constraining power, one PC is sufficient to describe the variation of baryonic effects in the observables, and the first PC amplitude (Q1) generally reflects the strength of baryon feedback. With the upper limit of Q1 prior being bound by the Illustris feedback scenarios, we reach $\sim 20{{\ \rm per\ cent}}$ improvement in the constraint of $S_8=\sigma _8(\Omega _{\rm m}/0.3)^{0.5}=0.788^{+0.018}_{-0.021}$ compared to the original DES 3 × 2pt analysis. This gain is driven by the inclusion of small-scale cosmic shear information down to 2.5 arcmin, which was excluded in previous DES analyses that did not model baryonic physics. We obtain $S_8=0.781^{+0.014}_{-0.015}$ for the combined DES Y1+Planck EE+BAO analysis with a non-informative Q1 prior. In terms of the baryon constraints, we measure $Q_1=1.14^{+2.20}_{-2.80}$ for DES Y1 only and $Q_1=1.42^{+1.63}_{-1.48}$ for DESY1+Planck EE+BAO, allowing us to exclude one of the most extreme AGN feedback hydrodynamical scenario at more than 2σ.
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Più fonti

Tesi sul tema "Baryonen"

1

Kiehlmann, H. D. [Verfasser]. "Vorhersage von Strukturfunktionen der Baryonen fuer die elektromagnetische und schwache Wechselwirkung / H. D. Kiehlmann". Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1188749358/34.

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2

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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3

Nicolini, Janina. "Study of rare beauty baryon decays with the LHCb detector". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP049.

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Abstract (sommario):
Les courants neutres avec changement de saveur, tels que les transitions b-> sl+l-, sont interdits au premier ordre dans le Modèle Standard (MS) et ne peuvent se produire qu'au niveau des boucles. Par conséquent, ils sont sensibles à la présence potentielle de Nouvelle Physique (NP) qui se manifestait par la présence de petites déviations par rapport aux prédictions du MS. Alors que la matière ordinaire est composée de baryons, très peu de mesures ont été réalisées avec des transitions baryoniques b-> sl+l- en raison de la suppression de la production de baryons de beauté dans les expériences travaillant auprès de collisionneurs. Dans cette thèse, plusieurs analyses sont présentées pour améliorer la connaissance des quatre baryons de beauté pour ce qui concerne leurs désintégrations via des transitions b-> sl+l-. Tout d'abord, le statut actuel de l'analyse angulaire des désintégrations Lambdab -> Lambdal+l- est réalisé pour la première fois en utilisant l'ensemble de la statistique collectée par l'expérience LHCb. Les dix coefficients angulaires sont mesurés dans la plage de masse invariante dileptonique au carré, q2, de 15 à 20 GeV^2/c^4 pour le mode muonique. La procédure d'ajustement a été validée avec des pseudo-expériences. Les observables angulaires des désintégrations Lambdab -> Lambdamu+mu- ne sont pas dévoilées sur les données dans le document de thèse. De plus, les modes de désintégration via des charmonia, Xib- -> Xi^-Jpsi et Omegab- -> Omega-Jpsi , ont été utilisés pour améliorer la connaissance des propriétés du baryon Omegab-. De manière similaire, les désintégrations Xib0 -> Xi0Jpsi et Xib0 -> Xi0psi(2S) précédemment non observées ont été étudiées. Cette thèse présente également le statut actuel de la première recherche de la désintégration Xib- -> Xi-mu+mu- et de l'observation de la désintégration Xib- -> Xi-psi(2S). Outre le travail d'analyse mené dans cette thèse, la contributions au détecteur à fibre scintillante (SciFi) de l'expérience LHCb est discutée
Flavour-changing neutral currents, such as b-> sl+l- transitions, are forbidden at tree level in the Standard Model (SM), and can only occur at loop level. Therefore, they are sensitive to small deviations from the presence of possible New Physics (NP) effects with respect to the SM predictions. While ordinary matter is made out of baryons, very few measurements have been performed with baryonic b-> sl+l- transitions due to the production suppression of beauty baryons at collider experiments. In this thesis, several analyses are presented to improve the knowledge of the four weakly decaying beauty baryons and respective b-> sl+l- transitions. First of all, the current status of the angular analysis of Lambdab -> Lambdal+l- decays is presented for the first time using the full Run~1 and 2 datasets collected by the LHCb experiment. All ten angular coefficients are attempted to be measured in the dilepton invariant mass squared, q2, range from 15 to 20 GeV^2/c^4 for the muon mode. The muon mode fit procedure has been validated with pseudo-experiments. The angular observables of the Lambdamu+mu- are kept blind in the thesis. Furthermore, the charmonium decay modes, Xib- -> Xi-Jpsi and Omegab- -> Omega-Jpsi, have been used to improve the knowledge of the Omegab- baryon properties. Similarly, the previously not observed Xib0 -> Xi0Jpsi and Xib0 -> Xi0 psi(2S) decays have been studied. In addition, this thesis also presents the current status for the first search for the Xib- -> Xi-mu+mu- decay and the observation of the respective Xib- -> Xi-psi(2S) decay. Besides the analysis work conducted in this thesis, the contributions to the Scintillating Fibre (SciFi) detector of the LHCb experiment are discussed
Flavour-ändernde neutrale Ströme, wie b-> sl+l- Übergänge, sind im Standardmodell (SM) auf Baumgraphen-Niveau verboten und können nur auf Schleifenebene auftreten. Daher sind sie sehr sensitiv gegenüber kleinsten Abweichungen in Bezug auf die SM-Vorhersagen erzeugt durch die mögliche Existenz der Neuen Physik (NP). Während gewöhnliche Materie aus Baryonen besteht, wurden bisher nur sehr wenige Messungen mit baryonischen b-> sl+l- Übergängen durchgeführt, da die Produktion von Beauty-Baryonen bei Beschleunigerexperimenten unterdrückt wird. In dieser Arbeit werden mehrere Analysen vorgestellt, um das Wissen über die vier schwach zerfallenden Beauty-Baryonen und die entsprechenden b-> sl+l- Übergänge zu verbessern. Zunächst wird der aktuelle Stand der Winkelanalyse von Lambdab-> Lambdal+l- Zerfällen präsentiert, in der zum ersten Mal die vollständigen Datensätze vom Run 1 und 2 des LHCb-Experiments genutzt werden. Alle zehn Winkelkoeffizienten werden im Bereich der quadrierten invarianten Dileptonenmasse 2q2 von 15 bis 20 GeV^2/c^4 für den myonischen Zerfallskanal gemessen. Das Verfahren zur Messung der Winkelkoeffizienten wurde mit Pseudo-Experimenten validiert. Der Signalbereich zur finalen Bestimmung der Werte der Winkelobservablen von dem Lambdab-> Lambdamu+mu- Zerfall wird in dieser Arbeit ausgespart. Darüber hinaus wurden die Charmonium-Zerfallskanäle Xib- -> Xi-Jpsi und Omegab- -> Omega-Jpsi dazu verwendet, die Erkenntnis über die Eigenschaften des Omegab- Baryonens zu verbessern. Ebenso wurden die bisher nicht beobachteten Xib0 -> Xi0Jpsi und Xib0 ->Xi0psi2S Zerfälle untersucht. Darüber hinaus wird in dieser Arbeit der aktuelle Stand der ersten Suche nach dem Xib- -> Xi-mu+mu- Zerfall und die Beobachtung des Xib- -> Xi-psi2S-Zerfalls dargestellt. Neben den in dieser Arbeit durchgeführten Analysen werden auch die Beiträge zum SciFi-Detektor des LHCb Experiments diskutiert
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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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5

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 travail. La seule approche con nue permettant de calculer ces observables en contrôlant tous les effets systématiques est la QCD sur réseau. Le C hapitre 1 est une introduction au formalisme de la QCD et à sa formulation discrétisée. Le second chapitre est dédié à la discréti sation particulière utilisée au sein de la collaboration Europan Twisted Mass (ETM). Le Chapitre 3 met en place la technologie nécessaire au calcul des masses des hadrons. L'estimation des intégrales fonctionnelles en utilisant le calcul massi vement parallèle sur des Super Calculateurs est décrite dans le Chapitre 4. La production de configurations de jauge sur ce type d'architecture constitue une part importante du travail effectué durant cette thèse. Le Chapitre 5 est dédié à la formulation des théories effectives dites de pertubations chirales. Les Chapitres 6 et 7 sont consacrés aux baryons légers et étranges. Les eff ets systématiques ainsi que les extrapolations chirales sont largement discutés
The aim of this work is an ab initio computation of the baryon masses starting from quantum chromodynamics (QCD). This theory describe the interaction betw een quarks and gluons and has been established at high energy thanks to one of its fundamental properties : the asymptotic freedom. This property predicts th at the running coupling constant tends to zero at high energy and thus that perturbative expansions in the coupling constant are justified in this regime. On the contrary the low energy dynamics can only be understood in terms of a non perturbative approach. To date, the only known method that allows the computat ion of observables in this regime together with a control of its systematic effects is called lattice QCD. It consists in formulating the theory on an Eucl idean space-time and to evaluating numerically suitable functional integrals. The chapter 1 and 2 are an introduction to the QCD in the continuum and on a discrete space time. The chapter 3 deals with the techniques needed to build hadronic correlator starting from gauge configuration. We then discuss how we determine hadron masses and their statistical errors. The numerical estimation of functional integral is explained in chapter 4. It is stressed that it requires sophisticated algorithm and massive parallel computating on BlueGene type architecture. Gauge configuration production is an important part of the work realized during my Ph. D. Chapter 5 is a critical review on chiral perturbation theory in the baryon sector. Th e chapters 6 and 7 are devoted to the analyze in the light and strange baryon sector. Systematics and chiral extrapolation are extensively discussed
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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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Abstract (sommario):
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 travail. La seule approche con nue permettant de calculer ces observables en contrôlant tous les effets systématiques est la QCD sur réseau. Le C hapitre 1 est une introduction au formalisme de la QCD et à sa formulation discrétisée. Le second chapitre est dédié à la discréti sation particulière utilisée au sein de la collaboration Europan Twisted Mass (ETM). Le Chapitre 3 met en place la technologie nécessaire au calcul des masses des hadrons. L'estimation des intégrales fonctionnelles en utilisant le calcul massi vement parallèle sur des Super Calculateurs est décrite dans le Chapitre 4. La production de configurations de jauge sur ce type d'architecture constitue une part importante du travail effectué durant cette thèse. Le Chapitre 5 est dédié à la formulation des théories effectives dites de pertubations chirales. Les Chapitres 6 et 7 sont consacrés aux baryons légers et étranges. Les eff ets systématiques ainsi que les extrapolations chirales sont largement discutés.
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7

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

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Chabanier, Solène. "Neutrinos and dark matter cosmology with the Lyman-α forest : the interplay between large-scale evolution and small-scale baryonic physics". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP034.

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Abstract (sommario):
Bien que le modèle cosmologique standard LCDM offre un cadre remarquablement en accord avec de nombreuses observations indépendantes, beaucoup de mystères persistent. En particulier, la masse des neutrinos est toujours inconnue. De par leur masse non nulle, ils laissent une empreinte sur les grandes structures de l'univers à travers l'échelle à laquelle ils diffusent, qui se manifeste comme un déficit de fluctuations de densité de matière aux petites échelles. Par ailleurs, le modèle de matière noire froide montre des tensions persistantes avec les observations sur des échelles inférieures au Mpc. Dans ce travail de thèse, j'utilise le spectre de puissance de la transmission de flux dans la forêt Lyman-α dans des spectres de quasars lointains afin de contraindre la somme des masses des neutrinos et étudier la plausibilité d'un modèle de matière noire tiède. Dans un premier temps, j'ai mesuré le spectre de puissance 1D de la forêt Lyα à 13 redshifts tel que 2 ≤ z ≤ 4.25 en utilisant 43,751 spectres de quasars de haute qualité des programmes BOSS et eBOSS du relevé spectroscopique SDSS. Afin d'obtenir des résultats robustes sachant que les incertitudes statistiques ont été réduites d'un facteur 3 par rapport à la mesure précédente, j'ai identifié et contrôlé plusieurs effets systématiques dans l'analyse de données. Modéliser le flux Lyα implique de recourir à des simulations hydrodynamiques cosmologiques sachant qu'il émerge de la combinaison complexe entre l'évolution des grandes structures et de la physique baryonique des petites échelles. En effet, les processus astrophysiques tels que la formation stellaire et les phénomènes de retro-action de supernovae et des trous noirs rejettent une quantité considérable d'énergie dans le milieu environnant et modifient l'état thermique et la distribution du gaz dans le milieu intergalactique. Afin d'améliorer les prédictions théoriques de la forêt Lyα à un niveau comparable des données, je contrains l'impact des mécanismes de retro-action des trous noirs sur le spectre de puissance Lyα grâce à un jeu de 8 simulations que j'ai produit en me basant sur des observations astrophysiques et qui couvre l'ensemble des modèles de feedback plausibles. Je fournis une correction analytique de cet effet ainsi qu'une limite supérieure et inférieure tel que 2 ≤ z ≤ 4.25 et je montre qu'ignorer un tel mécanisme induit un biais de 2σ sur n_s et 1σ sur σ_8. Finalement, je combine les mesure des spectres de puissance Lyα avec des données CMB et BAO afin de les comparer statistiquement aux prédictions théoriques des simulations hydrodynamiques pour améliorer la contrainte sur la somme des masses des neutrinos de Σ mν < 0.12 eV établie précédemment à Σ mν < 0.09 eV dans le cas le plus extrême à 95% de vraisemblance. Ce résultat indique une préférence des données pour un modèle normal de hiérarchie de masse. La combinaison des données Lyα eBOSS avec les données Lyα XQ-100, contraint la masse des reliques thermiques à m_X > 5.3 keV à 95% de vraisemblance dans un cas de modèle de matière noire entièrement constitué de matière noire tiède, ce qui se traduit par une limite supérieure sur les neutrinos stériles produits de manière non-résonante à mν_s > 34 kev. Aussi, les données Lyα-eBOSS confirme une tension existante avec les données CMB sur l'indice spectral n_s et indique une préférence pour une dépendance d'échelle non nulle de n_s à 3σ
Even if the standard cosmological LCDM model provides a remarkably successful framework to explain many independent observations, it still faces many challenges. In particular, the masses of neutrinos are still unknown and significantly alter structure formation because of their free-streaming that suppresses density fluctuations below a typical length scale inversely proportional to their rest mass. In addition, the cold dark matter (CDM) scenario is in tension with observations on scales smaller than the Mpc. In this thesis work, I use the power spectrum of the transmitted flux in the Lyman-α forest of distant quasar spectra to constrain the sum of neutrino masses, Σ mν, and determine the plausibility of a warm dark matter model, which is conveniently consistent with cold dark matter predictions on large scales while circumventing its issues at small scales because of its non-negligible velocity dispersion. First I measure the 1D power spectrum of the Lyα forest of 43,751 high quality quasar spectra between 2 ≤ z ≤ 4.6 from the BOSS and eBOSS programs of the SDSS spectroscopic survey. To obtain robust results given the unprecedented statistical power of the data I perform a careful investigation of observational systematic sources and their sources. Modeling the Lyα flux power spectrum requires to run hydrodynamical cosmological simulations because it arises from the complex interplay between large-scale structure evolution and small-scale baryonic physics. Indeed, astrophysical processes such as star formation or AGN feedback inject energy in the ambient medium and strongly impact the thermal state and gas distribution in the intergalactic medium. Including such processes in hydrodynamical simulations requires to rely on arbitrary parameters calibrated on astrophysical observations leading to discrepancies between different state-of-the-art simulations. In order to improve theoretical predictions of the Lyα forest, I constrain the impact of AGN feedback using a series of 8 hydro-cosmological simulations covering the whole plausible range of feedback models. I provide upper and lower limit for this signature for 2 ≤ z ≤ 4.25 and also show that ignoring this effect leads to 2σ shift on n_s and 1σ shift on σ_8. Finally, I combine the Lyα flux power spectrum measurements with CMB data, BAO data and theoretical predictions from hydrodynamical simulations to enhance the previously established constraints on the sum of neutrino masses from Σ mν < 0.12 eV to the most stringent constraints to date Σ mν < 0.09 eV in the most extreme case with 95% confidence, which tends to favor the normal hierarchy neutrino mass scenario. Combining eBOSS with XQ-100 Lyα data the mass m_X of hypothetical thermal relics is constrained to m_X > 5.3 keV at the 95% confidence level in the case of a pure warm dark matter scenario, which translates into mν_s > 34 kev for non-resonantly produced sterile neutrinos. Also, a mild-tension is found on n_s between eBOSS Lyα and CMB data, which translates into a preference for a non-zero running of n_s at the level of about 3σ
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9

Kerins, Eamonn John. "Baryonic dark matter and its detection". Thesis, Queen Mary, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243974.

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Miyamoto, Takaya. "Charmed baryon interaction from lattice QCD and its application to charmed hypernuclei". Kyoto University, 2019. http://hdl.handle.net/2433/242606.

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Libri sul tema "Baryonen"

1

Barnes, Ted, e Hans-Peter Morsch. Baryon excitations: Lectures of the COSY workshop held at the Forschungszentrum Jülich from 2 to 3 May 2000. Jülich, Germany: Forschungszentrum Jülich, Central Library, 2000.

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Riehecky, Janet. Baryonyx. Mankato, MN: Child's World, 1991.

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Moshe, Gai, a cura di. Baryons '92. Singapore: World Scientific, 1993.

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4

Lynden-Bell, D., e G. Gilmore, a cura di. Baryonic Dark Matter. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0565-8.

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D, Lynden-Bell, e Gilmore Gerry 1951-, a cura di. Baryonic dark matter. Dordrecht [Netherlands]: Kluwer Academic, 1990.

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Lynden-Bell, D. Baryonic Dark Matter. Dordrecht: Springer Netherlands, 1990.

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7

International Symposium on Lepton and Baryon Number Violation (1st 1998 Trento, Italy). Lepton and baryon number violation in particle physics, astrophysics, and cosmology: Proceedings of the First International Symposium on Lepton and Baryon Number Violation (Lepton-Baryon 98), European Centre for Theoretical Physics, Trento, Italy, 20-25 April 1998. Bristol: Institute of Physics Pub., 1999.

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Weigel, H. Chiral soliton models for baryons. Berlin: Springer, 2008.

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H, Toki, a cura di. Quarks, baryons and chiral symmetry. Singapore: World Scientific, 2001.

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Mollerach, Silvia. Axino-induced baryogenesis. Batavia, IL: Fermi National Accelerator Laboratory, 1991.

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Capitoli di libri sul tema "Baryonen"

1

Povh, Bogdan, Klaus Rith, Christoph Scholz e Frank Zetsche. "Baryonen". In Teilchen und Kerne, 207–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-13115-2_15.

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Povh, Bogdan, Klaus Rith, Christoph Scholz e Frank Zetsche. "Baryonen". In Teilchen und Kerne, 181–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-97475-5_14.

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Povh, Bogdan, Klaus Rith, Christoph Scholz e Frank Zetsche. "Baryonen". In Teilchen und Kerne, 193–217. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-10281-7_15.

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Povh, Bogdan, Klaus Rith, Christoph Scholz e Frank Zetsche. "Baryonen". In Teilchen und Kerne, 193–217. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-662-10282-4_15.

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Povh, Bogdan, Klaus Rith, Christoph Scholz e Frank Zetsche. "Baryonen". In Teilchen und Kerne, 187–211. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-10283-1_15.

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6

Povh, Bogdan, Klaus Rith, Christoph Scholz, Frank Zetsche e Werner Rodejohann. "Baryonen". In Teilchen und Kerne, 253–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37822-5_16.

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Carlson, C. E. "Perturbative QCD, Baryons, and Baryon Resonances". In New Aspects of Nuclear Dynamics, 71–92. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0547-7_3.

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Povh, Bogdan, Klaus Rith, Christoph Scholz, Frank Zetsche e Werner Rodejohann. "Baryons". In Graduate Texts in Physics, 253–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46321-5_16.

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Amsler, Claude. "Baryons". In The Quark Structure of Hadrons, 155–67. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98527-5_13.

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Rijken, Th A. "Baryon-Baryon Interactions". In Few-Body Problems in Physics ’93, 1–12. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-9352-5_1.

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Atti di convegni sul tema "Baryonen"

1

NAWA, KANABU, HIDEO SUGANUMA, ATSUSHI HOSAKA e TORU KOJO. "BARYONS AND BARYONIC MATTER IN HOLOGRAPHIC QCD". In Hadron and Nuclear Physics 09. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814313933_0015.

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2

Oset Baguena, Eulogio. "Interaction of vector mesons with baryons and the generation of baryonic resonances". In International Workshop on Effective Field Theories: from the pion to the upsilon. Trieste, Italy: Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.069.0059.

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Takeuchi, Sachiko, Makoto Takizawa, Kiyotaka Shimizu, Atsushi Hosaka, Kanchan Khemchandani, Hideko Nagahiro e Kanabu Nawa. "Negative-parity Λ[sub Q] baryons in the baryon-meson continuum". In INTERNATIONAL CONFERENCE ON THE STRUCTURE OF BARYONS (BARYONS' 10). AIP, 2011. http://dx.doi.org/10.1063/1.3647409.

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Oset, E. "Baryonic Resonances from the Interactions of the Baryon Decuplet and Meson Octet". In HADRON SPECTROSCOPY: Eleventh International Conference on Hadron Spectroscopy. AIP, 2006. http://dx.doi.org/10.1063/1.2176487.

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Murakami, Kotaro, Yutaro Akahoshi, Sinya Aoki e Kenji Sasaki. "Investigations of decuplet baryons from meson-baryon interactions in the HAL QCD method". In The 38th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.396.0345.

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Oset Baguena, Eulogio. "Baryonic resonances dynamically generated from the interactionof vector mesons with stable baryons of the decuplet". In 6th International Workshop on Chiral Dynamics. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.086.0053.

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GENG, L. S., J. MARTIN CAMALICH, L. ALVAREZ-RUSO e M. J. VICENTE-VACAS. "MASSES AND MAGNETIC MOMENTS OF GROUND-STATE BARYONS IN COVARIANT BARYON CHIRAL PERTURBATION THEORY". In Proceedings of the 14th National Conference on Nuclear Structure in China. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814447485_0013.

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Kato, Yuji. "Search for doubly-charmed baryons and study of charmed-strange baryon states at Belle". In XXII. International Workshop on Deep-Inelastic Scattering and Related Subjects. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.203.0195.

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Liang, Wei-Hong, C. W. Xiao e E. Oset. "Baryons with open beauty dynamically generated from meson-baryon interaction in the extended local hidden gauge approach". In XVITH INTERNATIONAL CONFERENCE ON HADRON SPECTROSCOPY: Hadron2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4949405.

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MANOHAR, A. V. "BARYONS". In Phenomenology of Large NC QCD. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776914_0015.

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Rapporti di organizzazioni sul tema "Baryonen"

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Swiatek, Joseph Alexander. A Study of charm baryons containing a lambda baryon in the final state. Office of Scientific and Technical Information (OSTI), aprile 1995. http://dx.doi.org/10.2172/1423680.

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2

Mukhopadhyay, N. C. Excited baryons. Office of Scientific and Technical Information (OSTI), gennaio 1986. http://dx.doi.org/10.2172/6901547.

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Gibney, Mark C. Photoproduction of Charmed Baryons. Office of Scientific and Technical Information (OSTI), aprile 1989. http://dx.doi.org/10.2172/1427791.

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Gibney, Mark C. Photoproduction of Charmed Baryons. Office of Scientific and Technical Information (OSTI), aprile 1989. http://dx.doi.org/10.2172/1156311.

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Becher. Baryon Chiral Dynamics. Office of Scientific and Technical Information (OSTI), agosto 2002. http://dx.doi.org/10.2172/799939.

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Bjorken, James. Masses of charm and strange baryons. Office of Scientific and Technical Information (OSTI), agosto 1986. http://dx.doi.org/10.2172/1163145.

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Mattson, Mark Edward. Search for Baryons with Two Charm Quarks. Office of Scientific and Technical Information (OSTI), gennaio 2002. http://dx.doi.org/10.2172/1420963.

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Summers, D. J. Charm strange baryons and the 1.5 prong. Office of Scientific and Technical Information (OSTI), dicembre 1992. http://dx.doi.org/10.2172/10125015.

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Bula, Rahmi. First Observation of An Excited Charm Baryon Decaying to Omega Charm Baryon at the BaBar Experiment. Office of Scientific and Technical Information (OSTI), gennaio 2006. http://dx.doi.org/10.2172/920288.

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Lanza, Lucille. Search for hybrid baryons with CLAS12 experimental setup. Office of Scientific and Technical Information (OSTI), marzo 2017. http://dx.doi.org/10.2172/1369432.

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