Thèses sur le sujet « Light quark »
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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.
Texte intégralSouchlas, Nicholas. « Quark Dynamics and Constituent Masses in Heavy Quark Systems ». Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1248013809.
Texte intégralMes, Alexes K. « Light Quark Masses from QCD Finite Energy Sum Rules ». Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30901.
Texte intégralNelson, Daniel Richard. « Partially Quenched Chiral Perturbation Theory and a Massless Up Quark : A Lattice Calculation of the Light-Quark-Mass Ratio ». Connect to this title online, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1038343149.
Texte intégralTitle from first page of PDF file. Document formatted into pages; contains xxiii, 296 p.; also includes graphics (some col.) Includes bibliographical references (p. 293-296). Available online via OhioLINK's ETD Center
Samways, Benjamin. « A lattice measurement of the B*Bπ coupling using DWF light quarks and the relativistic heavy quark action ». Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/361526/.
Texte intégralWilliams, Jimmy. « Two-loop renormalization of the quark propagator in the light-cone gauge ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0002/NQ43279.pdf.
Texte intégralHoltmann, Sven. « Goldstone mode effects and critical behaviour of QCD with 2 light quark flavours ». [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971814430.
Texte intégralDeWitt, Martin Alan. « The Spectrum and Decays of Scalar Mesons in the Light-Front Quark Model ». NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-03282008-142316/.
Texte intégralArndt, Daniel. « Light-Cone Quark Model Analysis ofPseudoscalar and Vector Mesons for Radially Excited States ». NCSU, 1999. http://www.lib.ncsu.edu/theses/available/etd-19990518-132243.
Texte intégralWe present a relativistic constituent quark model to analyze the mass spectrum and hadronic properties of radially excited u and d quark sector mesons.Using a simple Gaussian function as a trial wave function for the variational principle togetherwith a QCD motivated Hamiltonian, including not only the Coulomb and confiningpotential but also a relativistic corrected hyperfine interaction term, we obtain the mass spectrum consistent with the experimental data. To do the same for several observables such as decay constants and form factors it seems necessary to include bothDirac and Pauli form factors on the level of constituentquarks. Taking into account these quark form factorswe thus present the generalized formulas for the rho mesondecay constant and the rho meson form factors as well asthe $\pi\gamma$ transition form factor.We alsopredict several hadronic properties for the radiallyexcited states.
Arndt, Daniel. « Light-cone quark model analysis of pseudoscalar and vector mesons for radially excited states ». Raleigh, NC : North Carolina State University, 1999. http://www.lib.ncsu.edu/etd/public/etd-3522131849921371/etd.pdf.
Texte intégralOkugawa, Yuichi. « Analysis of test beam data using a technological prototype of a highly granular calorimeter and study of light quark production at a future linear collider ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP008.
Texte intégralThis thesis presents two main studies regarding the International Linear Collider (ILC), the future electron-positron linear collider operating at center of mass energy of √s = 250GeV, with the potential extension to √s = 1TeV. The first study is the analysis of data recorded with the silicon-tungsten electromagnetic calorimeter (SiW-ECAL) prototype. Highly granular calorimeters are part of all detector concepts of current and future particle physics projects, to precisely reconstruct the jet energy with high resolution using Particle Flow Algorithm. To verify the feasibility of a SiW-ECAL, 15 layers of a technological prototypes, comprising 15,360 silicon pixels, were assembled. After the full chain of commissioning, the prototypes were tested in beam at the SPS at CERN. The study analyzes one of the √s = 10GeV. Electron beam runs, and compare the result with the GEANT4 simulation using the same setup. The electromagnetic energy resolution for the 10 GeV run was measured to be 12.5±0.2% and found to be compatible with simulated result of 13.6±0.3%. The second study is the measurement of the differential cross sections of light quark production in the process in e⁺e⁻ → qqbar at √s = 250GeV with qqbar being u, d or s. The differential cross section is measured with respect to the cosine of the polar angle of the scattered quark. The precise measurement may allow for the extraction of electroweak coupling constants to the Standard Model photon or Z. These electroweak couplings depend on the fermion helicity. Therefore, this measurement is greatly supported by the polarization of electron and positron beams. In order to extract the underlying hard process, we select the charged Particle Flow Object (PFO) with the largest momentum within a jet. To accomplish this, a precise particle identification method is required. We use the dE/dx information provided by the Time Projection Chamber (TPC) of ILD. The obtained precision for the forward-backward asymmetry, A_{FB}, for the uubar and ddbar channels including the systematic error ranges between 3.1% and 9.5% at the time of the submission of thesis. For ssbar, A_{FB} can be measured with systematic uncertainty as small as 0.2% and 1.5%
Hepburn, Derek John. « Light hadron spectrum, quark masses and meson decay constants from lattice QCD with O(a)-improved dynamical Wilson fermions ». Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/15009.
Texte intégralRadloff, Peter. « Search for new light scalar bosons produced in association with a bottom-quark and decaying to two tau leptons ». Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/20536.
Texte intégralCaldeira, Balkeståhl Li. « Measurement of the Dalitz Plot Distribution for η→π+π−π0 with KLOE ». Doctoral thesis, Uppsala universitet, Kärnfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266871.
Texte intégralWallbott, Paul C. [Verfasser]. « Heavy-light four-quark states in the charmonium region in a Bethe-Salpeter and Dyson-Schwinger approach / Paul C. Wallbott ». Gießen : Universitätsbibliothek, 2020. http://d-nb.info/1209135248/34.
Texte intégralPeters, Antje Katharine [Verfasser], Marc [Gutachter] Wagner, Pedro [Gutachter] Bicudo et Christian [Gutachter] Fischer. « Investigation of heavy-light four-quark systems by means of Lattice QCD / Antje Katharine Peters ; Gutachter : Marc Wagner, Pedro Bicudo, Christian Fischer ». Frankfurt am Main : Universitätsbibliothek Johann Christian Senckenberg, 2017. http://d-nb.info/1141230682/34.
Texte intégralPrausa, Mario Verfasser], Robert V. [Akademischer Betreuer] [Harlander et Michal [Akademischer Betreuer] Czakon. « Towards light quark mass effects in Higgs production and decay at next-to-next-to-leading order / Mario Prausa ; Robert Valentin Harlander, Michal Wiktor Czakon ». Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1171818564/34.
Texte intégralPrausa, Mario [Verfasser], Robert V. [Akademischer Betreuer] Harlander et Michal [Akademischer Betreuer] Czakon. « Towards light quark mass effects in Higgs production and decay at next-to-next-to-leading order / Mario Prausa ; Robert Valentin Harlander, Michal Wiktor Czakon ». Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1171818564/34.
Texte intégralGallorini, Stefano. « Study of the K+ → e+νeγ decay with the NA62 experiment ». Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85872.
Texte intégralVolk, Alexei. « Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu l nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub| ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24169.
Texte intégralMoomaw, Peter. « Drooped Strings and Dressed Mesons : Implications of Gauge-Gravity Duality for the Properties of Heavy-Light Mesons at Finite Temperature ». University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250538856.
Texte intégralCASULA, ESTER ANNA RITA. « Low mass dimuon production with the ALICE muon spectrometer ». Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266451.
Texte intégralSandmeyer, Hauke [Verfasser]. « Hadronic correlators from heavy to very to very light quarks / Hauke Sandmeyer ». Bielefeld : Universitätsbibliothek Bielefeld, 2019. http://d-nb.info/1189813165/34.
Texte intégralGavin, Elizabeth Jane Ogle. « Bound states of heavy and light quarks in the framework of quantum chromodynamics ». Master's thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/14576.
Texte intégralThe spectra of the D, F, B and E mesons have been calculated using the MIT bag model together with a static potential related to the Fourier transform of the "dressed" gluon propagator. The heavy quark has been assumed to coincide 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 states is compared with the result expected from the hyperfine splitting of the D and B mesons. It appears that tris ratio is model dependent. More experimental data are required to further evaluate the validity of this model.
Wissel, Sönke. « Mesonic correlation functions from light quarks and their spectral representation in hot quenched lattice QCD ». [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982318332.
Texte intégralGerardin, Antoine. « Heavy-light meson properties from latice QCD ». Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112185/document.
Texte intégralHeavy-light mesons play an important role in the search of new physics beyond the Standard Model. In particular B-mesons properties can be used to put constraints on the matrix elements of the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix governing flavour-changing weak decays.The dynamics of quarks and gluons are described by Quantum Chromodynamic (QCD). This theory predicts that, at low energies, the associated coupling constant increases, making the use of perturbative methods ineffective. Lattice QCD is a non-perturbative regularization scheme of QCD, suitable for numerical simulations. However, studying heavy-light mesons remains a challenging task due to the many different energy scales that must be considered simultaneously on the lattice. In this work, I use the Heavy Quark Effective Theory (HQET), which consists in a systematic expansion of the QCD Lagrangian and correlation functions in 1/m where m is the mass of the heavy quark.After a presentation of the main techniques used in lattice simulations, a computation of the b-quark mass with nf=2 dynamical quarks is presented. All the steps are performed non-perturbatively, offering an important cross-check of the value cited in the PDG which mainly relies on perturbation theory. A computation of the B-meson decay constant at static and first orders in HQET will be also presented and phenomenological implication are discussed.In the second part of this thesis, after introducing the Heavy Meson Chiral Lagrangians and its different couplings, I present the lattice computation of two such couplings. The first one is associated to the hadronic transitionB* '→Bπ where B* 'is the radial excitation of the vector B meson. The Generalized Eigenvalue Problem (GEVP) will be used to extract information about the excited state from the ratio of three-point to two-point correlation functions and I will discuss the phenomenological implications of our results. Then, I will present the computation of the coupling h between the scalar and the pseudoscalar B mesons using two-point correlation functions. This coupling enters the formulae used to guide the chiral extrapolations when positive parity states are taken into account. We will see that h is large compared to the other couplings and that B meson orbital excitation degrees of freedom cannot be missed in chiral loops.Finally, I will present the lattice computation of the mass and decay constant of the first radial excitation of the D meson. The mass will be compared with the recently observed state by the BaBar Collaboration and I show how the decay constant can help to solve the so-called "1/2 vs. 3/2'' puzzle. In this work, the GEVP is used to control the contribution from higher excited states and continuum and chiral extrapolations are performed to take intro account systematic errors
ming-long, Hong, et 洪敏隆. « Some Topics of Hadrons within Light-Front Quark Model ». Thesis, 2006. http://ndltd.ncl.edu.tw/handle/84217206039344986497.
Texte intégral國立高雄師範大學
物理學系
94
Recently, the pentaquarrk has been found in some experiments. The mass of is 1540MeV, but its magnetic moment is unknown.. If we want to identify the pentaquark, we need to know its magnetic moment like mass. Theorists have made several assumptions about the structure of the pentaquark. We choose one of them: the Jaffe- Wilczek model. In this work, we calculate its magnetic moment within the light front mode. In addition, for understanding more information inside mesons, we try to construct the D and D^smesons in S-wave and P-wave state including the hyperfine and fine splitting. Finally, the third topic is the mass and the two photon decay width of eta_b . It is known that decay widths depend on the form factor. We make use the form factors to predict the widths directly. On the other hand, we use our theory to predict the value of eta_c and fit the experimental data to enhance our persuasion.
Nicmorus, Marinescu Diana [Verfasser]. « Electromagnetic properties of light and heavy baryons in the relativistic quark model / vorgelegt von Diana Nicmorus Marinescu ». 2007. http://d-nb.info/985123788/34.
Texte intégralHoltmann, Sven [Verfasser]. « Goldstone mode effects and critical behaviour of QCD with 2 light quark flavours / vorgelegt von Sven Holtmann ». 2004. http://d-nb.info/971814430/34.
Texte intégralVolk, Alexei [Verfasser]. « Measurement of the partial branching fraction for inclusive semileptonic B meson decays to light hadrons B→Xulv and an improved determination of the quark mixing matrix element Vub / von Alexei Volk ». 2009. http://d-nb.info/100774944X/34.
Texte intégralJin, Luchang. « Lattice Calculation of Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment ». Thesis, 2016. https://doi.org/10.7916/D8319W3T.
Texte intégralLi, Meng-Wei, et 李孟瑋. « Approaching Connement Structure for Light Quarks in a Holographic Soft Wall QCD Mode ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/hef2gs.
Texte intégral國立交通大學
物理研究所
105
In this thesis, I study confinement-deconfinement phase transition of light quarks by holographic soft-wall QCD model. I obtain the phase structure of the black hole backgrounds by solving the Einstein-Maxwell-scalar system analytically. I impose probe open strings in such background to investigate the confinement-deconfinement phase transition from different open string configurations. Finally, I obtain the Cornell potential in confinement phase by the Wilson loop.
Wissel, Sönke [Verfasser]. « Mesonic correlation functions from light quarks and their spectral representation in hot quenched lattice QCD / vorgelegt von Sönke Wissel ». 2006. http://d-nb.info/982318332/34.
Texte intégral