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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"antiquark"”.
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Perturbative Check of the Action and Energy Lattice Sum Rules
… sum rule gives a relation between the quark-antiquark potential, its logarithmic derivative with respect to distance and the expectation value of the action; the energy sum rule expresses the potential as the sum of the energy in the gluon fields and of an anomalous term. Two different …
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Spectroscopy of exotic charm mesons from lattice QCD
… are mesons that cannot be described as a quark-antiquark pair. The number of exotic mesons has been growing every year in the charm sector and the theoretical understanding of them is often conflicted amongst the community. Some possible explanations include hybrid mesons where the …
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The proton's longitudinal spin structure studied through the weak interaction in pp collisions
… structure of the proton. The degree to which the antiquarks and gluons of radiative origin inside the proton contribute to the total spin is particularly not well confined. The PHENIX experiment at RHIC has made measurements that have, and will, better confine these spin contributions. One of …
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Diffraction in electron-proton collisions
… section for diffractive production of a quark-antiquark pair from a real or virtual photon. This allows us to give detailed predictions for diffractive electro- or photoproduction of a jet pair, for diffractive charm production, and for the inclusive cross section in diffractive deep inelastic …
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The Static Quark Potential at Finite Temperature and Density
… energy between an infinitely heavy quark-antiquark pair at high temperatures and densities. The calculations are carried out via lattice QCD in conjunction with a recently developed Bayesian inference method. We provide a detailed overview lattice QCD, Bayesian infer- ence methods and the …
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Numerical tests of dual superconductivity in non-abelian lattice gauge theories
… procedure for determining the part of the quark-antiquark potential produced by magnetic currents is then developed. The computer algorithms required to perform these numerical tests are then discussed as well as the results of the project. Finally, I present further supporting evidence involving …
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Spatial Structure of the Composite Particles in the 2 + 1 Dimensional U(1) Four-Fermi Model at Finite Chemical Potential
… found that the correlation between the quark and antiquark that comprise the composite particle developed Friedel-type oscillation when the chiral symmetry is restored. The study is of interest to the physics of hadrons at finite density (chemical potential).
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Spatial structure of the composite particles in the 2+1 dimensional U(1) four-fermi model at finite chemical potential
… found that the correlation between the quark and antiquark that comprise the composite particle developed Friedel-type oscillation when the chiral symmetry is restored. The study is of interest to the physics of hadrons at finite density (chemical potential).
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Linear Sigma Models in QCD and S3 Symmetry for Neutrinos
… which contains two scalar nonets (one of quark-antiquark type and the other of diquark-antidiquark type) and two corresponding pseu- doscalar nonets. It is shown that a reasonable agreement with experimental data is obtained up to about 1 GeV. Some comparison is made to the situation in the …
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Bound states of heavy and light quarks in the framework of quantum chromodynamics
… with the centre of the bag, while the Light antiquark was treated relativistically using the Dirac equation. The spectra obtained are compared with experimental data as well as with the results of other models of these Qq mesons. The ratio mb/mc obtained in the fit to experimentally known …
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Soft diffractive high energy scattering and form factors in nonperturbative QCD
… vacuum. We describe mesons in a simple quark-antiquark picture, for baryons we assume a quark-diquark structure, as hadronic wave functions we apply a Wirbel-Stech-Bauer ansatz. In the following we calculate integrated and differential cross sections from the scattering amplitudes, as well for …
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Heavy quarks in the initial stages of proton-ion collisions [I quark pesanti negli stati iniziali delle collisioni protone-ione]
… di dissociazione del 50% nelle coppie quark-antiquark. Inoltre, i campi del glasma presentano una forte anisotropia in impulso e trasmettono una parte consistente di tale anisotropia ai quark pesanti che vi si evolvono. Infine, abbiamo esteso il nostro studio a un mezzo non boost-invariante e …
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Measurement of the Beam Asymmetry for the ETA and ETA Prime Mesons with the Gluex Experiment
… aims to provide evidence of hybrid mesons, quark-antiquark pairs with gluonic excitations, which are predicted by quantum chromodynamics calculations on the lattice. GlueX features a linearly-polarized photon beam incident on a liquid hydrogen target and a nearly-four-pi hermetic detector capable …
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From Static Potentials to High-Energy Scattering
… to show consistency with the static quark-antiquark potential. We generalize Meggiolaro's analytic continuation from parton-parton to dipole-dipole scattering and obtain a Euclidean approach to high-energy scattering that allows us in principle to calculate S-matrix elements in lattice QCD. …
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Quarkonium Suppression in pPb Collisions at CMS and Timing Detectors for Future Collider Experiment
… Quarkonium, bound states of heavy quark–antiquark pairs, provide sensitive probes in this context because their survival strongly depends on binding energy and the surrounding medium. The excited-to-ground state charmonium cross-section ratio, 𝟁(2S)/J/𝟁, measured in pPb collisions at 8.16 …
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Exotic States in Quarkonium Physics: Effective Theories of Heavy Mesonic Molecules and an AdS/QCD Model of Hybrid Quarkonium
… that is bound states containing a heavy quark-antiquark pair</p><p>which nevertheless cannot be be understood working only with the standard quark</p><p>model of hadrons. Candidates for such states, long speculated to exist, have recently</p><p>been observed at particle colliders, so that the …
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Thomas Fermi model for mesons and new noise subtraction techniques in lattice QCD.
… the existence of mesons with two or more quark-antiquark pairs is investigated with a new application of the Thomas-Fermi (TF) statistical quark model. Quark color couplings are treated in a mean field manner similar to a previous application to baryons, and short and concise expressions for …
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A measurement of the x dependent sea flavor asymmetry at Seaquest
… Drell-Yan process to improve the accuracy of the antiquark PDFs in the parton momentum fraction x range 0.1 to 0.58. By measuring the cross section ratio of proton-deutrium(x)/proton-proton(x) one can derive an estimate of the proton sea flavor asymmetry, dbar/ubar, as a function of x. This …
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Strongly coupled plasmas and the QCD critical point
… the screening length defined by the static quark-antiquark pair. Finally, we compute the energy density and angular distribution of the power radiated by a quark undergoing circular motion in the vacuum of any conformal field theory that has a dual classical gravity description and many colors. In …
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Flux tube profiles at high temperature
… pair and trying to bind a quark and an antiquark together is chromo-electric. By exploring the temperature dependence of the longitudinal profiles we were able to show that the field strength distributions approach the one of a single isolated quark when the rising temperature approaches …
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