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Dissertations / Theses on the topic 'Quantum chromodynamics'

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1

Soerensen, P. H. "Soft divergences in quantum chromodynamics." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384315.

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2

Von, Oertzen Detlof Wilhelm. "Transport coefficients in quantum chromodynamics." Doctoral thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/22057.

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Relativistic kinetic theory provides a transport equation for classical, spinless, colored particles in a non-Abelian external field. We review the methods of solution used in the literature to find the transport coefficients for quark and gluon systems. Most authors use the relaxation time approximation of the Boltzmann equation to compute the transport coefficients, but this method has shortcomings in mixtures. We use the Chapman Enskog (CE) method to solve the classical transport equations for quarks and gluons for the transport coefficients. The differential crosssections describing the pa
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3

Tsegaye, Takele Dessie. "Confinement Mechanisms in Quantum Chromodynamics." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1051373650.

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4

Detmold, William. "Nonperturbative approaches to quantum chromodynamics." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phd4817.pdf.

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5

Peláez, Arzúa Monica Marcela. "Infrared correlation functions in Quantum Chromodynamics." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066491/document.

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Le but de cette thèse est l'étude des fonctions de corrélation des théries Yang-Mills dans le régime infrarouge. Il est connu que, à cause de l'invariance jauge, il est nécessaire de fixer la jauge pour calculer des valeurs moyennes analytiquement. La procedure de fixation gauge standard est la procedure de Faddeev-Popov (FP). Le Lagrangien de FP permet de faire des calculs perturbatifs pour la Chromodynamique Quantique dans le régime de hautes énergies dont les résultats sont comparés avec succès avec des expériences. Cependant, dans le régime de basses énergies, il se trouve que la constante
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6

Bass, Steven David. "Spin dependent effects in quantum chromodynamics /." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phb317.pdf.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1993.<br>Copies of three of the author's previously published articles inserted as appendix B. Includes bibliographical references.
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7

Malaza, E. D. "Jet multiplicity distributions in quantum chromodynamics." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382607.

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8

Dasgupta, M. "Power suppressed corrections in quantum chromodynamics." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598295.

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The purpose of the research described in this dissertation, is to establish a bridge between perturbative and non-perturbative aspects of QCD. While it is remarkable that the factorisation theorems of QCD allow one the freedom to carry out perturbative calculations in most cases of interest, it cannot be forgotten that perturbation theory can never provide a complete description of strong interaction phenomena. The factorisation theorems themselves make allowance for non-perturbative effects by parametrising them through parton distributions and fragmentation functions, which has given rise to
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9

Daniel, David John. "Towards phenomenology from lattice quantum chromodynamics." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/13558.

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10

Sheard, Stephen Noel. "Weak interactions in lattice quantum chromodynamics." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/14402.

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11

Chalmers, David Lindsay. "Numerical studies of lattice quantum chromodynamics." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/13347.

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12

Dharmaratna, Welathantri G. D. "Massive quark polarization in Quantum Chromodynamics subprocesses /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1990.

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Thesis (Ph.D.)--Tufts University, 1990.<br>Adviser: Gary R. Goldstein. Submitted to the Dept. of Physics. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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13

Hierl, Dieter. "Lattice Quantum ChromoDynamics with approximately chiral fermions." kostenfrei, 2008. http://www.opus-bayern.de/uni-regensburg/volltexte/2008/1020/.

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14

Papadopoulos, Stavros. "Aspects of perturbative corrections in quantum chromodynamics." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74317.

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The perturbative regime of Quantum Chromodynamics (QCD) is considered and certain aspects related with higher order corrections (HOC) are studied. Certain large correction terms in the perturbative expansion are determined, in particular for large transverse momentum $(p sb{T})$ direct photon production. The origin of these terms is specified and simple forms, called K-factors, are provided (soft gluon approach).<br>Furthermore, for processes initiated by 2 $ to$ 2 particle subprocesses the structure of the complete HOC is analyzed. It is shown that when structure functions and/or fragmentatio
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15

Portelli, Antonin. "Nonpertubative quantum chromodynamics and isospin symmetry breaking." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4110.

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Depuis les années 1930, on sait que le noyau des atomes est composé de deux types de particules: les protons et les neutrons. Ces deux particules sont très similaires: d'une part le neutron est subtilement plus lourd (un pour mille) que le proton et d'autre part le proton porte une charge électrique positive tandis que le neutron est neutre. La petite différence de masse entre le neutron et le proton fourni l'énergie suffisante pour autoriser désintégration où un neutron se désintègre en un proton en émettant un électron et un anti-neutrino électronique. Aussi, le fait que le proton ne se dési
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16

Shi, Zhifeng. "Multi-meson systems from Lattice Quantum Chromodynamics." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539623623.

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Systems of non-zero isospin chemical potential ( muI), where the chemical potential for up and down quarks is equal in magnitude but of opposite sign, do not suffer from the sign problem, and normal LQCD techniques can be successfully adapted to study such systems. From chiral perturbation theory (chiPT), in addition to the deconfined phase transition at high temperature at zero chemical potential, another phase transition from ordinary hadronic states to a Bose Einstein Condensate (BEC) state has been conjectured [1] at non-zero isospin chemical potential. Such a BEC phase is of phenomenologi
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17

Cook, Merritt S. "Exotic meson decay widths using lattice quantum chromodynamics." FIU Digital Commons, 2006. http://digitalcommons.fiu.edu/etd/2526.

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Most experiments in particle physics are scattering experiments, the analysis of which leads to masses, scattering phases, decay widths and other properties of one or multi-particle systems. Until the advent of Lattice Quantum Chromodynamics (LQCD) it was difficult to compare experimental results on low energy hadron- hadron scattering processes to the predictions of QCD, the current theory of strong interactions. The reason being, at low energies the QCD coupling constant becomes large and the perturbation expansion for scattering amplitudes does not converge. To overcome this, one puts the t
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18

Fariborz, A. H. "Investigations in light-quark low-energy quantum chromodynamics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28486.pdf.

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19

Ford, I. J. "Aspects of pure quantum chromodynamics on large lattices." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382631.

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20

Tonkin, S. P. "A study of the vacuum of quantum chromodynamics." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375326.

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21

Nail, Graeme. "Quantum chromodynamics : simulation in Monte Carlo event generators." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/quantum-chromodynamics-simulation-in-monte-carlo-event-generators(46dc6f2e-1552-4dfa-b435-9608932a3261).html.

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This thesis contains the work of two recent developments in the Herwig general purpose event genrator. Firstly, the results from an new implementation of the KrkNLO method in the Herwig event generator are presented. This method allows enables the generation of matched next-to-leading order plus parton shower events through the application of simple positive weights to showered leading order events. This simplicity is achieved by the construction Monte Carlo scheme parton distribution functions. This implementation contains the necessary components to simulation Drell-Yan production as well as
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22

Hutchcroft, David Edward. "Quantum chromodynamics with the OPAL detector at LEP." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624733.

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23

Zimak, Petr. "Canonical quantization and quantum chromodynamics in a cavity." Doctoral thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/22142.

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The canonical quantization formalism is applied to the Lagrange density of chromodynamics in a general covariant gauge. The physical states are characterized by their BRS-invariance. We develop the quantum theory of the interacting fields in the Dirac picture, based on the Gell-Mann and Low Theorem and the Dyson expansion of the time evolution operator. Subsequently, confinement is introduced phenomenologically by imposing, on the quark, gluon and ghost field operators, the linear boundary conditions of the M.I.T. bag model at the surface of a spherically symmetric and static cavity. Based on
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24

Schreiber, Gunhild Ursula. "The gluon self-energy in cavity quantum chromodynamics." Doctoral thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/17391.

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Bibliography: p. 78-79.<br>A numerical technique to regularize divergent loop diagrams in cavity quantum chromodynamics is discussed, which is closely related to free space dimensional regularization. In this cavity regularization method, the energy shift is expressed as the integral of a divergent spectral function, from which the divergence may be extracted by analogy to the free space expression. It is shown for the case of the self-energy of a gluon in a cavity that no new divergences arise due to the presence of the boundary, provided that the regularization can be achieved in such a way
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25

Ramlakan, Alastair. "Flavour SU(3) symmetry breaking in quantum chromodynamics." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/6547.

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Includes bibliographical references.<br>The subject of this thesis is the determination of the size of SU(3) flavour symmetry breaking in the QeD vacuum, as measured by the ratio of the strange to non-strange quark vacuum condensates <ss>/<uu> (with <ūu>
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26

Murphy, Kevin Christoher Klink William H. "The structure of gluons in point form quantum chromodynamics." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/411.

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27

Von, Hippel Georg Matthias. "Aspects of quantum chromodynamics : high temperatures and heavy quarks." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615784.

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28

Munier, Stéphane. "Quantum chromodynamics at high energy and noisy traveling waves." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00712413.

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When hadrons scatter at high energies, strong color fields, whose dynamics is described by quantum chromodynamics (QCD), are generated at the interaction point. If one represents these fields in terms of partons (quarks and gluons), the average number densities of the latter saturate at ultrahigh energies. At that point, nonlinear effects become predominant in the dynamical equations. The hadronic states that one gets in this regime of QCD are generically called "color glass condensates". Our understanding of scattering in QCD has benefited from recent progress in statistical and mathematical
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29

Perantonis, S. J. "Model calculations in quantum chromodynamics and other field theories." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379929.

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30

Gibbs, P. E. "Applications of the Lanczos Algorithm to lattice quantum chromodynamics." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372404.

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31

Fong, 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.

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32

Lim, Matthew Alexander. "Quantum chromodynamics and the precision phenomenology of heavy quarks." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/285109.

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In this thesis we consider the phenomenology of the theory of strong interactions, Quantum Chromodynamics (QCD), with particular reference to the ongoing experimental program at the Large Hadron Collider in CERN. The current progress in precision measurement of Standard Model processes at the LHC experiments must be matched with corresponding precision in theoretical predictions, and to this end we present calculations at next-to-next-to-leading order in perturbation theory of observable quantities involving quarks and gluons, the strongly interacting particles of the SM. Such calculations for
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33

Andrikopoulou, Anastasia. "Exclusive decays and hardronic wave functions in quantum chromodynamics." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37617.

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34

Bell, J. M. "The structure of quantum chromodynamics at the symmetric point." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3001770/.

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This thesis contains a study on the structure of the vertex functions of Quantum Chromodynamics (QCD) in both linear and non-linear gauges. In particular we show results for the arbitrary linear covariant gauge at two loops as well as renor- malizing the one loop non-linear Curci-Ferrari gauge and maximal abelian gauge (MAG). The full minimal subtraction MS and momentum subtraction (MOM) scheme renormalization of QCD is performed in all three gauges. This is carried out for an arbitrary colour group at one loop for the maximal abelian gauge and at two loops for the arbitrary linear covariant a
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35

Brown, Zachary S. "Heavy flavor interactions and spectroscopy from lattice quantum chromodynamics." W&M ScholarWorks, 2015. https://scholarworks.wm.edu/etd/1539623998.

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In the present work, spectroscopy and interactions of hadrons containing heavy quarks is investigated. In particular, a focus is placed on properties of exotic heavy hadronic states, including doubly and triply heavy baryons and doubly heavy tetraquark states. The framework in which these calculations are carried out is provided by lattice quantum chromodynamics, a discrete formulation of the modern theory of the strong interaction. The main body of the thesis had two main project focuses. For the first project, an extensive calculation of the mass spectrum of doubly and triply heavy baryons i
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36

Murphy, Kevin Christoher. "The structure of gluons in point form quantum chromodynamics." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/411.

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This dissertation investigates part of the strong nuclear force in point form QCD. The quark sector is neglected to focus on gluons and their self-interactions. The structure of gluons is investigated by building up a field theory for massless particles. Single gluon states are defined, and a condition is implemented to make the wave function inner product positive definite. The transformation between gluon and classical gluon fields generates a differentiation inner product, and the kernels allow for transition between momentum and position space. Then, multiparticle gluon states are introduc
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37

Maelger, Jan. "Perturbative perspectives on the Phase diagram of Quantum ChromoDynamics." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX050/document.

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L'étude du diagramme des phases de la Chromodynamique Quantique (QCD) et des transitons associées (déconfinement et restoration de la symétrie chirale) représentent des défis majeurs de la Physique moderne et nombreuses sont les approches théoriques qui visent à en sonder les multiples facettes. Du fait de l'intensité de l'interaction forte dans les régimes d’énergie pertinents pour les transitions susmentionnées, ces approches sont en général de nature non-perturbative, la théorie des perturbations étant réputée inapplicable à ces échelles. Il est, cependant, bien établi que le point de dépar
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38

Ashley, Jonathan D. "Investigations in non-perturbative QCD." Title page, abstract and table of contents only, 2004. http://hdl.handle.net/2440/37959.

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In this thesis we review two methods for studying the non-pertubative region of QCD: the effective field theory, chiral perturbation theory (χPT), and the cloudy bag model, a successful chiral quark model of hadron structure. We use information from both of these sources to construct a simple extrapolation formula in the pion mass, mπ, for the nucleon electromagnetic form factors, which combines the correct non-analytic chiral behaviour predicted by (χPT), with the correct large mπ behaviour. This formula is applied to recent quenched lattice QCD results to extrapolate to the physical regime.
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39

Shcheredin, Stanislav. "Simulations of lattice fermions with chiral symmetry in quantum chromodynamics." Doctoral thesis, [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97410907X.

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40

Miravitllas, Mas Ramon. "Asymptotic expansions, resurgence and large order behaviour of quantum chromodynamics." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667932.

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En les teories quàntiques de camps, les prediccions numèriques d’observables físics només es poden calcular amb expansions pertorbatives en potències de les constants d'acoblament, els paràmetres que determinen la força de les interaccions entre camps. Mentre que l’èxit predictiu de la teoria quàntica de camps no es pot negar, aquests càlculs pertorbatius estan plens de divergències. D’una banda, els coeficients de l’expansió pertorbativa es calculen a partir d’integrals de loops que són divergents la majoria de les vegades. Algunes d’aquestes divergències estan associades a termes no físic
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41

Budczies, Jan. "The color-flavor transformation and its applications to quantum chromodynamics." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964923106.

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42

Enberg, Rikard. "Quantum chromodynamics and colour singlet exchange in high energy interactions." Doctoral thesis, Uppsala University, Department of Nuclear and Particle Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3385.

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<p>Quantum chromodynamics (QCD) is the fundamental theory in elementary particle physics that describes the strong interaction in terms of exchanges of force-carrying, <i>colour</i>-charged particles known as gluons. Although well-established through experimental verifications, there are fundamental unsolved problems in the theory.</p><p>In this thesis, some novel aspects of strong interaction dynamics are studied in the context of <i>colour singlet exchange</i> processes — interactions where complex systems of gluons with no net colour charge are exchanged. Both perturbative and non-perturbat
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43

Heybrock, Simon [Verfasser], and Tilo [Akademischer Betreuer] Wettig. "Computational methods for Quantum Chromodynamics / Simon Heybrock. Betreuer: Tilo Wettig." Regensburg : Universitätsbibliothek Regensburg, 2013. http://d-nb.info/1035808641/34.

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44

Knowles, Ian Garfield. "The treatment of spin in hard processes using quantum chromodynamics." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317835.

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45

Bilson-Thompson, Sundance Osland. "Investigation of topology, instantons, and the Nahm transform in lattice QCD using highly improved operators." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb5996.pdf.

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46

Waugh, Robert George. "Measurement of event shape variables in deep inelastic scattering." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301504.

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47

Reader, Matthew Thomas. "Extracting Λ MS from experiment". Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5363/.

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48

L'Heureux, Pierre. "Parton picture of soft pp and p̄p reactions." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71998.

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We study a model for inclusive central particle production in pp and pp reactions based on parton model concepts and lowest-order QCD. In this picture, two-gluon fusion creates a heavy excited state (fireball) whose decay (described by statistical considerations) leads to the creation of light hadrons with low transverse momenta. Agreement with experimental data is found to be good. This first model is then embedded (providing energy dependence) in a two-component eikonal model used to study elastic diffraction and unifying parton model and impact parameter formulations. We discuss the inclusi
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49

Turnock, Graham. "Applications of resummation techniques to electron-positron annihilation." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259591.

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50

Turner, Miriam Frances. "Tests of QCD at the Z'0 resonance." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239763.

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