Дисертації з теми "Quark fragmentation"
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Gomshi, Nobary M. A. "Heavy quark fragmentation models." Thesis, Durham University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328988.
Повний текст джерелаPierre, Nicolas. "Multiplicities of hadrons in deep-inelastic scattering of muons on nucleons at COMPASS." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS183/document.
Повний текст джерелаOne of the goals of the COMPASS collaboration is the study of the nucleon spin structure. The question of the polarization of the sea quark is a burning issue in the hadronic physics, especially for the strange quark polarization. In order to better constrain the quark polarization, a precise knowledge of the quark Fragmentation Functions (FFs) into hadrons, which are the final state hadronisation of quark q into hadron h, is mandatory. The FFs can be extracted from hadron multiplicities produced in Semi-Inclusive Deep Inelastic Scattering (SIDIS). Data were taken at COMPASS from a 160 GeV/c muon beam scattering off a pure proton target (1H₂). This thesis presents the measurement of charged hadrons (pions, kaons and protons) multiplicities from SIDIS data collected in 2016. It also details the improvements brought to the DJANGOH event generator to better describe the inclusive and semi-inclusive radiative corrections in DIS that are then used as correction factors to the multiplicities. The data cover a large kinematical range : Q² > 1 (GeV/c)², y ε [0.1,0.7], x ε [0.004,0.4], W ε [5,17] GeV et z ε [0.2,0.85]. These multiplicities, which represent about 1800 data points in total, provide an important input for global QCD fit of world data at NLO, aiming at the FFs determination. The quark FFs into kaons are particularly awaited as they can better constrain the strange quark polarization
Dupré, Raphaël. "Quark Fragmentation and Hadron Formation in Nuclear Matter." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10221/document.
Повний текст джерелаThe hadron formation is, in the framework of the quantum chromodynamics theory (QCD), a non-perturbative process; this characteristic leads to important theoretical challenges. This is why experimental measurements of fragmentation in nuclei are a necessity in order to obtain substantial progress in our understanding of the mechanisms of hadron formation. The thesis begins with the introduction of theoretical background, followed by an overview of theoretical models. The thesis continues with the analysis of Jefferson Lab data obtained with a 5 GeV electron beam incident on various targets (2H, C, Al, Fe, Sn and Pb). The reaction products are measured with the CLAS spectrometer of Hall B. The main results are: (a) a multi-dimensional analysis of the measured observables, which permits a better confrontation with theoretical models and the extraction of temporal information on fragmentation, and (b) the observation of a non linear hadronic attenuation as a function of the target’s nuclear radius. The PyQM event generator, developed to reproduce the data from the HERMES collaboration, is also presented. The results are ambivalent, the theoretical basis used does not seem to apply to the studied case, however, some characteristics of the data are reproduced allowing to understand their origin, which is sometimes unexpected. Finally, the possibilities for future experiments, at Jefferson Lab and at an Electron-Ion Collider (EIC), are explored
Fickinger, Michael, Sean Fleming, Chul Kim, and Emanuele Mereghetti. "Effective Field Theory approach to heavy quark fragmentation." SPRINGER, 2016. http://hdl.handle.net/10150/623954.
Повний текст джерелаMakke, Nour. "Measurement of the polarization of strange quark in the nucleon and determination of quark fragmentation functions into hadrons." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00673486.
Повний текст джерелаBen-Haim, Eli. "La fonction de fragmentation du quark b, du LEP au TeVatron." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00010858.
Повний текст джерелаSilvestor, Ian Malcolm. "The design of the ZEUS tracking trigger and studies of b quark fragmentation." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236181.
Повний текст джерелаCuriel, Garcia Quiela Marina. "Measurement of Hadron Multiplicities in Deep Inelastic Scattering and Extraction of Quark Fragmentation Functions." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112392/document.
Повний текст джерелаL'un des objectifs de l'expérience COMPASS est l'étude de la structure du nucléon de spin. Les données ont été prises à partir d'un faisceau de muons polarisée (160 GeV/c) diffuse sur une cible polarisée (6LiD ou NH3). Dans ce contexte, la nécessité d'une connaissance précise des fonctions de fragmentation des quarks (état final du hadronisation de quarks q en hadrons h, FFs) a été soulevée. Le FFs peuvent être extraites de multiplicités de hadrons produits en Semi-Inclusive diffusion profondément inélastique (SIDIS). Cette thèse présente la mesure de la multiplicité de hadrons charge (pions et kaons) à partir de données SIDIS collectées en 2006. Les données couvrent un large domaine cinématique : Q2>1 (GeV/c)2, y є [0.1,0.9], x є [0.004,0.7] and W є [5,17] GeV. Ces multiplicités fournissent un apport important pour l'analyse des données mondiales au 2ème ordre de QCD, visant la détermination de FFs
Ghez, Philippe. "Etude de la fragmentation des jets de quark et de gluon dans l'expérience UA1." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37597910j.
Повний текст джерелаMao, Yaxian. "Mesure des corrélations gamma-hadrons et hadrons-hadrons dans les collisions pp à 7 TeV pour l'étude de la fragmentation des jets avec l'expérience ALICE du LHC." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00622562.
Повний текст джерелаDiab, Batoul. "Fragmentation of jets containing a J/ψ meson in PbPb and pp collisions at 5 TeV with the CMS detector". Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX072.
Повний текст джерелаThe Quark-Gluon Plasma (QGP) is a state of matter where quarks and gluons are asymptotically free, and not confined in hadrons. Ultra relativistic heavy-ion collisions are a unique tool to produce the QGP in laboratory frame. Since it cannot be directly seen, probes are used to measure its properties, one of which is the J/ψ meson. The J/ψ production, however is still not completely understood.In this thesis the fragmentation of J/ψ in jets is measured in pp and PbPb collisions at 5 TeV. Prompt and nonprompt J/ψ fragmentation functions are shown and compared to the models in pp. The nuclear modification factor of J/ψ in jets is also shown. The J/ψ-in-jets results indicates that prompt J/ψ mesons are produced in parton showers and are affected by energy loss processes in the presence of a hot and dense strongly-interacting medium
Pronko, Alexandre P. "Fragmentation of quark and gluon jets in proton-antiproton collisions at center-of-mass energy of 1.8 TeV." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010127.
Повний текст джерелаTaylor, Wendy Jane. "A measurement of b-quark fragmentation fractions in p¢p collisions at [centre of mass energy]=1.8 TeV." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/NQ41323.pdf.
Повний текст джерелаTallini, Hugh Arthur McLaren. "A measurement of the quark spin distributions of the nucleon at HERMES." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367159.
Повний текст джерелаArbor, Nicolas. "Etude de la fragmentation des partons par mesure de corrélations photon-hadrons auprès de l'expérience ALICE au LHC." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00944789.
Повний текст джерелаRohrmoser, Martin. "Study of correlations of heavy quarks in heavy ion collisions and their role in understanding the mechanisms of energy loss in the quark gluon plasma." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0015/document.
Повний текст джерелаContext: Quantum chromodynamics (QCD), the theory of the strong interactions, predicts a new state of matter, the quark-gluon plasma (QGP), where its fundamental degrees of freedom, the quarks and gluons, behave quasi-freely. The required high temperatures and/orparticle densities can be expected for the early stages of the universe and in neutron stars, but have lately become accessible by highly energetic collisions of heavy ion cores. Commonly, these experiments study the QGP by the detection of hard probes, i.e. highly energetic particles, most notably heavy quarks, that pass the medium. The mechanisms of their energy-loss in the QGP are not yet completely understood. In particular, they are attributed to processes of either additional, medium induced radiation or 2 to 2 particle scattering, or combinations thereof.Methods: In a theoretical, phenomenological approach to search for new observables that allow discriminating between these collisional and radiative energy-loss mechanisms a Monte-Carlo algorithm that simulates the formation of particle cascades from an initial particle was implemented. For the medium, different types of QGP-jet interactions, corresponding to collisional and/orradiative energy loss, were introduced. Correlations between pairs of final cascade particles, where one represents a heavy trigger quark, were investigated as a means to differentiate between these models.Findings: The dependence of angular opening for two particle correlations as a function of particle energy may provide a means to disentangle collisional and radiative mechanisms of in-medium energy loss
Vauthier, Astrid. "Mesure des corrélations photon-hadron auprès de l'expérience ALICE au LHC pour l'étude du plasma de quarks et de gluons." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY062/document.
Повний текст джерелаThe quantum chromodynamics (QCD), the theory used at present to describe the strong interaction, predicts the existence of a phase transition, at very high temperature and/or density, towards a state of nuclear matter where quarks and gluons are deconfined : the Quark-Gluon Plasma (QGP). Such a medium can be produced in laboratory, and the measurement of its properties allows to give a new perspective on the mechanisms of interactions between the constituents as well as to test the QCD in unexplored domains.Ultra-relativistic heavy ion collisions delivered by the accelerator LHC at CERN allow to obtain the thermodynamical conditions necessary for the QGP to be formed. By means of a diversified instrumentation, the ALICE experiment allows to reach a large number of observables allowing to characterize the QGP. Among these, the measurement of the fragmentation of the partons (quarks and gluons) allows to study in detail the mechanisms of energy loss in the medium and its redistribution in the final state, and can also be compared with theoretical calculations, based on QCD, that model the interaction of an energetic parton with the QGP which is passing through.The work presented in this manuscript is articulated around the study of the fragmentation function via the measurement of the photon-hadron correlations in proton-proton and proton-Lead collisions. At first, a work on energy calibration of the ALICE experiment’s electromagnetic calorimeter was realized, along with the characterization of the uncertainties of this calibration. Secondly, the photon-hadron correlations, whose main difficulty is the identification of the direct photons, were studied. The results obtained in both systems of collisions demonstrate the feasibility of the analysis which can be easily widened to the peripheral Lead-Lead collisions. Finally, this work shows that the dominant uncertainties of the measurement will be reducible with the new data delivered by the LHC
Fickinger, Michael. "Applications of Effective Field Theories for Precision Calculations at e⁺e⁻ Colliders." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241973.
Повний текст джерелаSanchez, Castro Xitzel. "KOs and lambda production associated to high-p T charged hadrons in Pb-Pb collisions at √sNN = 2.76 TeV with ALICE : comparison between the hard and "soft" processes related to the production of hadrons." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE006/document.
Повний текст джерелаIn ultrarelativistic heavy-ion collisions, the QCD matter is under extreme conditions of energy density, forming a quark-gluon plasma (QGP), in which quarks and gluons are deconfined. At RHIC and LHC energies, a large baryon-to-meson ratio, like Λ/K0S, was observed within the transverse momentum range 2 < pT < 6 GeV/c for central heavy-ion collisions. The goal of this dissertation is to verify if the baryon-to-meson enhancement is only due to collective effects of the bulk of matter, and if there is also a contribution related to in-medium modifications of parton fragmentation.With two-hadron angular correlations, the K0S and Λ produced in association to an energetic hadron (hard processes) are separated from those originated from the thermalised medium (soft processes). The differential Λ/K0S ratios related to the soft or hard production processes are extracted. The results are obtained for the Pb-Pb collisions at √sNN = 2.76 TeV recorded in 2011 with the ALICE experiment
Bonis, Isabelle de. "Etude des désintégrations semi-leptoniques du méson B, dans les canaux D*lv et Dlv, auprès du détecteur ALEPH, au LEP : mesure de la fonction de fragmentation du quark b et recherche d'états D**." Lyon 1, 1994. http://www.theses.fr/1994LYO10156.
Повний текст джерелаKucera, Vit. "Study of strange particule production in jets with the alice experiment at the LHC." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE048/document.
Повний текст джерелаQuark–gluon plasma is a state of matter existing under extreme energy densities and temperatures where quarks and gluons are deconfined. This hot and dense strongly interacting matter can be created in ultra-relativistic heavy-ion collisions. Measurements of spectra of identified particles produced in jets represent a major tool for studying properties of the plasma created in the collisions and for understanding the interplay of various mechanisms which contribute to the particle production in this medium. In this thesis, we present the measurement of the transverse-momentum spectra of Λ baryons and K0S mesons produced in charged jets in central Pb–Pb collisions at the centre-of-mass energy sqrt(sNN) = 2.76 TeV, measured with ALICE at the LHC. The results of the analysis are used to discuss the origin of the enhancement of the baryon-to-meson ratio observed for the inclusive production of light-flavour particles in ultra-relativistic heavy-ion collisions
Perret, Pascal. "Etude de la production de quarks lourds avec ALEPH." Clermont-Ferrand 2, 1990. http://www.theses.fr/1990CLF21228.
Повний текст джерелаFong, Che Ping. "Jet fragmentation at small momentum fractions in quantum chromodynamics." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239209.
Повний текст джерелаThibaud, Florian. "Développement de détecteurs Micromegas pixellisés pour les hauts flux de particules et évaluation de la contribution diffractive à la leptoproduction de hadrons à COMPASS." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112239/document.
Повний текст джерелаThis thesis is dedicated to the development and characterisation of a new generation of Micromegas (MICROMEsh GAseous Structure) detectors for the COMPASS experiment at Cern, and the estimation of the diffractive processes’ contribution to the production of pions and kaons, concerning the study of the quark fragmentation functions into hadrons at COMPASS. New Micromegas detectors with a 40 x 40 cm² active area are being developed for the future physics program of the COMPASS experiment starting in 2015. These detectors will have to work in high muon and hadron flux (close to 8 MHz/cm²). In this context, a central area of about 5 cm diameter, crossed by the beam, will be composed of 1280 pixels, and discharge-reduction technologies will be used. Four prototypes with a final read-out geometry, using two different discharge-reduction technologies have been produced at Cern and studied in nominal conditions at COMPASS between 2010 and 2012. Three are hybrid detectors using a GEM (Gas Electron Multiplier) foil as a preamplification stage to reduce the discharge probability. The other is equipped with a so called “buried resistors” resistive structure allowing to strongly reduce the discharge amplitude. Their performances are presented in this thesis. The impact of these results on the production and implementation of the final series of detectors is also discussed. Quark fragmentation functions into hadrons describe the hadronisation of a quark of flavor q into a hadron h. These universal functions take part in the cross-section expression of several processes. They can be accessed at COMPASS via semi-inclusive deep inelastic scattering of muons off nucleons. The relevant observables for fragmentation function extraction are hadron multiplicities, corresponding to the mean number of hadrons produced per deep inelastic scattering event. Vector mesons produced by a diffractive process can decay into pions and kaons. As such processes do not involve quark hadronisation, they should a priori be excluded from multiplicity measurements. This work presents a Monte-Carlo study of the impact of diffractive rho and phi production on light hadrons and inclusive events yields. Multiplicity correction factors are finally established. The effect of this correction on the extraction of pion fragmentation functions is also discussed
Dupré, Raphaël. "Fragmentation des Quarks et Formation des Hadrons dans la Matière Nucléaire." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00751424.
Повний текст джерелаDixon, Paul. "A study of the fragmentation of quarks in ep collisions at HERA." Thesis, Lancaster University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389935.
Повний текст джерелаKant, David. "A study of the fragmentation of quarks in e-p collisions at HERA." Thesis, Queen Mary, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338959.
Повний текст джерелаLévy, Jean-Marc. "Etude de la fragmentation des quarks lourds en mesons charmes dans l'experience delphi au lep." Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR13132.
Повний текст джерелаBenchouk, Chafik. "Fonctions de distribution et fonctions de fragmentation de quarks dans l'état final hadronique de la diffusion muon-nucléon à 280 GeV/c." Aix-Marseille 2, 1986. http://www.theses.fr/1986AIX22068.
Повний текст джерелаBenchouk, Chafik. "Fonctions de distribution et fonctions de fragmentation de quarks dans l'état final hadronique de la diffusion muon-nucléon à 280 GeV/c." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37595891m.
Повний текст джерелаElwood, John Kenneth. "Effective Field Theories in the Study of K_L → π^+π^-e^+e^- and Heavy Quark Fragmentation". Thesis, 1997. https://thesis.library.caltech.edu/10370/1/Elwood_JK_1997.pdf.
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