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Tesi sul tema "Light quark"

Autore: Grafiati

Pubblicato: 7 luglio 2024

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1

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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2

Souchlas, Nicholas. "Quark Dynamics and Constituent Masses in Heavy Quark Systems." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1248013809.

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3

Mes, Alexes K. "Light Quark Masses from QCD Finite Energy Sum Rules." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30901.

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Due to quark-gluon confinement in QCD, the quark masses entering the QCD Lagrangian cannot be measured with the same techniques one would use to determine the mass of non-confined particles. They must be determined either numerically from Lattice QCD, or analytically using QCD sum rules. The latter makes use of the complex squared energy plane, and Cauchy’s theorem for the correlator of axial-vector divergences. This procedure relates a QCD expression containing the quark masses, with an hadronic expression in terms of known hadron masses, couplings, and lifetimes/widths. Thus, the quark masse

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4

Nelson, 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.

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Thesis (Ph. D.)--Ohio State University, 2002.<br>Title 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

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5

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/.

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I describe a calculation of the B*Bπ coupling in lattice QCD. The B*Bπ coupling is directly related to gb, the leading order low-energy interaction constant of heavy meson chiral perturbation theory. Knowledge of the coupling will help decrease systematic uncertainties in lattice QCD B-physics studies, which are important to constrain the CKM matrix and probe the Standard Model. This calculation is performed with 2+1 flavours of dynamic quarks using the domain wall fermion action. To simulate the heavy b-quark I use a non-perturbatively tuned relativistic heavy quark action which keeps discret

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6

Williams, 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.

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7

Holtmann, 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.

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8

DeWitt, 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/.

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We use the light-front quark model to investigate the structure of the scalar mesons, mainly focusing on the three heavy isoscalar states f0(1370), f0(1500), and f0(1710). We comput the spectrum of scalar mesons by diagonalizing a relativized, QCD-inspired model Hamiltonian written in a basis of 25 simple harmonic oscillator states. The masses are then used to perform a mixing analysis which assumes that the heavy isoscalars are mixtures of quarkonia and the scalar glueball. The resulting quark-glue content is used along with the meson wave functions determined from the spectrum to compute the

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9

Arndt, 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.

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<p>We 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 for

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10

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.

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11

Okugawa, 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.

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Cette thèse présente deux études principales concernant le collisionneur linéaire international (ILC), le futur collisionneur linéaire électron-positron fonctionnant à une énergie de centre de masse de √s = 250GeV, avec une extension potentielle à √s = 1TeV.La première étude porte sur l'analyse des données enregistrées avec un prototype d’un calorimètre électromagnétique silicium-tungstène (SiW-ECAL). Les calorimètres à haute granularité font partie de tous les concepts de détecteurs des projets actuels et futurs de la physique des particules. Ce type de calorimètre permet de reconstruire préc

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12

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.

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In this thesis I present results for the light hadron spectrum, light quark masses and meson decay constants from numerical simulations of lattice QCD. The simulations were performed on a 16<sup>3</sup> x 32 space-time lattice using the standard Wilson gauge field action and a fully <i>O</i>(<i>a</i>)-improved Sheikholeslami-Wohlert fermion action with <i>N<sub>j</sub> </i>= 2 degenerate flavours of dynamical fermions. A subset of these simulations were performed at fixed lattice spacing, as determined through the Sommer scale parameter, <i>r</i><sub>o</sub>, in order to investigate the effect

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13

Radloff, 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.

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A search for new neutral scalar bosons produced in association with a bottom-quark is performed. The analysis uses data acquired with proton-proton collisions at a center-of-mass energy of 8 TeV and observed with the ATLAS detector at the LHC, corresponding to 20.3 $fb^{-1}$ of integrated luminosity. The search focuses on scalar boson decays into tau lepton pairs, where each decays leptonically ($\tau \rightarrow l \nu_{\tau} \bar{\nu_{l}}$) resulting in one muon, one electron and four neutrinos. No significant excess is observed and upper limits on the signal strength are determined as a func

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14

Caldeira, 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.

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The mechanism of the isospin violating η→π+π−π0 decay is studied in a high precision experiment using a Dalitz plot analysis. The process is sensitive to the difference between up and down quark masses. The measurement provides an important input for the determination of the light quark masses and for the theoretical description of the low energy strong interactions. The measurement was carried out between 2004 and 2005 using the KLOE detector at the DAΦNE e+e− collider located in Frascati, Italy. The data was collected at a center of mass energy corresponding to the φ-meson peak (1019.5 MeV)

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15

Wallbott, 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.

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16

Peters, Antje Katharine [Verfasser], Marc [Gutachter] Wagner, Pedro [Gutachter] Bicudo, and 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.

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17

Prausa, Mario Verfasser], Robert V. [Akademischer Betreuer] [Harlander, and 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.

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18

Prausa, Mario [Verfasser], Robert V. [Akademischer Betreuer] Harlander, and 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.

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19

Gallorini, Stefano. "Study of the K+ → e+νeγ decay with the NA62 experiment". Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85872.

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The present thesis is focused on the measurement of the form factors of the K+ → e+νeγ decay (Ke2γ) with data collected by the NA62 experiment in 2007 during a preliminary phase of data taking, dedicated to a precision test of lepton flavour universality. For this phase, the NA62 collaboration used the pre-existing apparatus of the NA48/2 experiment. The measurement of the form factors is a test for the effective theories of strong interaction at low energies as the Chiral Perturbation Theory (ChPT) and the Light Front Quark Model (LFQM). The only kinematic configuration accessible to th

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20

Volk, 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.

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This thesis presents an analysis of inclusive semileptonic $B \to X_u e \nu$ decays using approximately 454 million $\Upsilon(4S) \to B \bar{B}$ decays collected during the years 1999 to 2008 with the BABAR detector. The electron energy, $E_e$, and the invariant mass squared of the electron-neutrino pair,$ q^2$, are reconstructed, where the neutrino kinematics is deduced from the decay products of both B mesons. The final hadronic state,$ X_u$, consists of a sum of many hadronic channels, each of which contains at least one $u$ quark. The variables $q^2$ and $E_e$ are then combined to comp

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21

Moomaw, 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.

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22

CASULA, 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.

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Low mass vector meson (ρ, ω,Φ ) production provides key information on the hot and dense state of strongly interacting matter produced in high-energy heavy ion collisions (called Quark Gluon Plasma). Strangeness enhancement is one of the possible signatures of the Quark Gluon Plasma formation and can be accessed through the measurement of Φ meson production with respect to ρ and Φ mesons, while the measurement of the Φ nuclear modification factor provides a powerful tool to probe the production dynamics and hadronization process in relativistic heavy ion collisions. Vector mesons can be dete

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23

Sandmeyer, Hauke [Verfasser]. "Hadronic correlators from heavy to very to very light quarks / Hauke Sandmeyer." Bielefeld : Universitätsbibliothek Bielefeld, 2019. http://d-nb.info/1189813165/34.

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24

Gavin, 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.

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Bibliography: leaves 53-55.<br>The 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

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25

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.

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26

Gerardin, Antoine. "Heavy-light meson properties from latice QCD." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112185/document.

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Les mésons lourd-légers jouent un rôle majeur dans la recherche de nouvelle physique au delà du modèle standard. En particulier, les propriétés du méson B sont utilisées pour contraindre la matrice Cabibbo-Kobayashi-Maskawa (CKM) qui décrit les changements de saveur d’un quark lors d’une interaction faible.Les interactions entre quarks et gluons sont décrites par la théorie de l'interaction forte (QCD). Cette dernière prédit, qu'à faible énergie, le couplage de la théorie croît rendant tout traitement perturbatif impossible. La QCD sur réseau est une régularisation non-perturbative de la QCD a

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27

ming-long, Hong, and 洪敏隆. "Some Topics of Hadrons within Light-Front Quark Model." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/84217206039344986497.

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碩士<br>國立高雄師範大學<br>物理學系<br>94<br>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 a

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28

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.

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29

Holtmann, 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.

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30

Volk, 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.

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31

Jin, Luchang. "Lattice Calculation of Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment." Thesis, 2016. https://doi.org/10.7916/D8319W3T.

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The quark-connected part of the hadronic light-by-light scattering contribution to the muon’s anomalous magnetic moment is computed using lattice QCD with chiral fermions. We report several significant algorithmic improvements and demonstrate their effectiveness through specific calculations which show a reduction in statistical errors by more than an order of magnitude. The most realistic of these calculations is performed with a near-physical, 139 MeV pion mass on a (5.5 fm)³ spatial volume using the 48³ × 96 Iwasaki gauge ensemble of the RBC/UKQCD Collaboration.

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32

Li, Meng-Wei, and 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.

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碩士<br>國立交通大學<br>物理研究所<br>105<br>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.

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33

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.

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