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Nucleon Electromagnetic Form Factors And Electroexcitation Of Low Lying Nucleon Resonances In A Light Front Relativistic Quark Model
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Book Synopsis Nucleon Electromagnetic Form Factors and Electroexcitation of Low Lying Nucleon Resonances in a Light-front Relativistic Quark Model by :
Download or read book Nucleon Electromagnetic Form Factors and Electroexcitation of Low Lying Nucleon Resonances in a Light-front Relativistic Quark Model written by and published by . This book was released on 2012 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We utilize a light-front relativistic quark model (LF RQM) to predict the 3q core contribution to the electroexcitation amplitudes for the?(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 up to Q2 = 12 GeV2. The parameters of the model have been specified via description of the nucleon electromagnetic form factors in the approach that combines 3q and pion-cloud contributions in the LF dynamics.
Book Synopsis Electroexcitation of the ?(1232)32+ and ?(1600)32+ in a Light-front Relativistic Quark Model by :
Download or read book Electroexcitation of the ?(1232)32+ and ?(1600)32+ in a Light-front Relativistic Quark Model written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, the magnetic-dipole form factor and the ratios REM and RSM for the ?* N → ?(1232)3/2+ transition are predicted within light-front relativistic quark model up to photon virtuality Q2=12 GeV2. Furthermore, we predict the helicity amplitudes of the ?* N → ?(1600)3/2+ transition assuming the ?(1600)3/2+ is the first radial excitation of the ground state Delta(1232)3/2+.
Book Synopsis Electroexcitation of Nucleon Resonances by :
Download or read book Electroexcitation of Nucleon Resonances written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We review recent progress in the investigation of the electroexcitation of nucleon resonances, both in experiment and in theory. The most accurate results have been obtained for the electroexcitation amplitudes of the four lowest excited states, which have been measured in a range of Q2 up to 8 and 4.5 GeV2 for the Delta(1232)P33, N(1535)S11 and N(1440)P11, N(1520)D13, respectively. These results have been confronted with calculations based on lattice QCD, large-Nc relations, perturbative QCD (pQCD), and QCD-inspired models. The amplitudes for the Delta(1232) indicate large pion-cloud contributions at low Q2 and don't show any sign of approaching the pQCD regime for Q27 GeV2. Measured for the first time, the electroexcitation amplitudes of the Roper resonance, N(1440)P11, provide strong evidence for this state as a predominantly radial excitation of a three-quark (3q) ground state, with additional non-3-quark contributions needed to describe the low Q2 behavior of the amplitudes. The longitudinal transition amplitude for the N(1535)S11 was determined and has become a challenge for quark models. Explanations may require large meson-cloud contributions or alternative representations of this state. The N(1520)D13 clearly shows the rapid changeover from helicity-3/2 dominance at the real photon point to helicity-1/2 dominance at Q2 0.5 GeV2, confirming a long-standing prediction of the constituent quark model. The interpretation of the moments of resonance transition form factors in terms of transition transverse charge distributions in infinite momentum frame is presented.
Book Synopsis Electromagnetic Form Factors of Nucleons in a Relativistic Three-quark Model by : M.A. Ivanov
Download or read book Electromagnetic Form Factors of Nucleons in a Relativistic Three-quark Model written by M.A. Ivanov and published by . This book was released on 1996 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Dynamics: From Quarks to Nuclei by : M.T. Pena
Download or read book Nuclear Dynamics: From Quarks to Nuclei written by M.T. Pena and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the 20th CFIF fall workshop held in Lisbon, Portugal, in October/November 2002. The focus of these papers is on the latest experimental observations and on theoretical progress made in the fields of few-nucleon dynamics and related problems. The topics range from electron-nucleus scattering, meson production, relativistic effects, structure of nucleons and of light nuclei, to heavy-ion collisions.
Book Synopsis Perspectives In Nuclear Physics At Intermediate Energies - Proceedings Of The Conference by : Sigfrido Boffi
Download or read book Perspectives In Nuclear Physics At Intermediate Energies - Proceedings Of The Conference written by Sigfrido Boffi and published by World Scientific. This book was released on 1996-03-20 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the latest theoretical and experimental results and future perspectives regarding electromagnetic and hadronic physics at intermediate energies. Nucleon form factors and spin structure functions, deep-inelastic scattering, excited baryons and mesons, and correlations in nuclei are discussed. Many new results and the scientific programmes of the different laboratories in Europe and North America are also presented. A special section is devoted to relativistic approaches to hadrons and nuclei at intermediate energies.
Book Synopsis Analysis of Nucleon Electromagnetic Form Factors from Light-Front Holographic QCD by :
Download or read book Analysis of Nucleon Electromagnetic Form Factors from Light-Front Holographic QCD written by and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nstar 2001 - Proceedings Of The Workshop On The Physics Of Excited Nucleons by : Dieter Drechsel
Download or read book Nstar 2001 - Proceedings Of The Workshop On The Physics Of Excited Nucleons written by Dieter Drechsel and published by World Scientific. This book was released on 2001-08-28 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of N∗s can provide us with critical insights into the nature of QCD in the confinement domain. The keys to progress in this domain are the identification of its important degrees of freedom and the effective forces between them. The nucleon is the simplest system in which the nonabelian character of QCD is manifest. There are Nc quarks in a baryon because there are Nc colors, and as a consequence Gell-Mann and Zweig were forced to introduce the quarks in order to describe the octet and decuplet baryons.This volume gives a status report on the recent experimental and theoretical results in the field of nucleon resonance physics. A wealth of new high precision data was presented from facilities around the world, such as BES, BNL, ELSA, GRAAL, JLab, MAMI, MIT/Bates, SPring8, and Yerevan. Particular emphasis was laid on polarization degrees of freedom and large acceptance detectors as precision tools for studying small but important transition amplitudes, and the helicity (spin) structure of the nucleon. There were new results describing the nucleon resonance structure on the basis of quantum chromodynamics, either directly in terms of quarks and gluons by means of lattice gauge theory, or in terms of hadrons in the framework of chiral field theories. A status report on duality showed the surprising connections between the physics of the low energy nucleon resonance region and the realm of quark structure functions in deep inelastic scattering. Finally, this volume contains a summary report of the BRAG workshop, devoted to the analysis of baryon resonances.
Book Synopsis Excited Nucleons And Hadron Structure - Proceedings Of The Nstar 2000 Conference by : Volker Burkert
Download or read book Excited Nucleons And Hadron Structure - Proceedings Of The Nstar 2000 Conference written by Volker Burkert and published by World Scientific. This book was released on 2001-02-28 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference NSTAR 2000 was part of a series of conferences and workshops that began in New York in 1988. Since then, the field of excited nucleons and hadron structure has developed enormously, and the scope has broadened. Most significantly, new experimental facilities have come into operation, allowing precise measurements of resonance couplings and transition form factors. The search for “missing” quark model states and gluonic excitations in complex hadronic channels is now possible.On the theory side, new and promising developments have emerged: quark models with meson degrees of freedom, hybrid baryon models, and studies of baryons in the limit of many colors. For the first time, lattice QCD has been employed to calculate masses of excited nucleons. Nucleon resonances are now recognized as providing significant contributions to the nucleon spin sum rules, as well as the Gerasimov-Drell-Hearn and Bjorken integrals, at finite momentum transfer.
Book Synopsis The Form Factors of the Nucleons by :
Download or read book The Form Factors of the Nucleons written by and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author demonstrates that a relativistic constituent quark model can give nucleon form factors that agree well with recent, accurate measurements. The relativistic features of the model and the specific form of the wave function are essential for the result.
Download or read book NSTAR 2004 written by Jean-Paul Bocquet and published by World Scientific Publishing Company Incorporated. This book was released on 2004-01-01 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent advances in the field of nucleon resonances presented at the IX International Workshop on the Physics of Excited Baryons, NSTAR2004. A complete overview of the most recent experimental results obtained worldwide on baryon spectroscopy is presented together with theoretical progress on related topics ranging from resonance parameters extraction to lattice-QCD calculations through effective field theory. Of particular interest, a large part of the book is devoted to exotic states with quantum numbers of pentaquarks, whose recent discovery represents a new chapter in hadronic physics.
Book Synopsis Models of the Nucleon by : Rajat K. Bhaduri
Download or read book Models of the Nucleon written by Rajat K. Bhaduri and published by Addison Wesley Publishing Company. This book was released on 1988 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nstar 2002 - Proceedings Of The Workshop On The Physics Of Excited Nucleons by : Steven A Dytman
Download or read book Nstar 2002 - Proceedings Of The Workshop On The Physics Of Excited Nucleons written by Steven A Dytman and published by World Scientific. This book was released on 2003-07-07 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent advances in the physics of nucleon resonances, including new experimental results from laboratories in the USA, Europe, and Asia, and new developments in effective field theories, quark models, and lattice gauge theory.
Book Synopsis Particles and Nuclei by : Carl Carlson
Download or read book Particles and Nuclei written by Carl Carlson and published by World Scientific. This book was released on 1997 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is devoted to phenomena that are of interest to both particle and nuclear physicists. The topics include nucleon structure (including spin structure), electron, neutrino, and hadron scattering from nucleons and nuclei, strange matter, the standard model, theory of nucleons and nuclei from both the QCD and nucleon-meson viewpoints, new experimental techniques, and new facilities."--Publisher's website.
Book Synopsis Electroexcitation of the Roper Resonance in the Relativistic Quark Models by :
Download or read book Electroexcitation of the Roper Resonance in the Relativistic Quark Models written by and published by . This book was released on 2007 with total page 25212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The amplitudes of the transition gamma* N -> P11(1440) are calculated within light-front relativistic quark model assuming that the P11(1440) is the first radial excitation of the 3q nucleon state. The results are compared with those obtained in close approaches by other authors and with standard nonrelativistic results. One of the reasons for this study was to present all these results within unified definition of helicity amplitudes consistent with the definition used in the extraction of the helicity amplitudes from experimental data in one-pion electroproduction. The results of relativistic quark models are qualitatively in good agreement with each other and differ strongly from nonrelativistic calculations. At small Q2, these results for the transverse amplitude A12 are consistent, but fail to reproduce experimental data. The most probable explanation of this discrepancy is the absence of pion cloud contribution in the approaches under consideration.
Book Synopsis Comparison of Nucleon Form Factors from Lattice QCD Against the Light Front Cloudy Bag Model and Extrapolation to the Physical Mass Regime by :
Download or read book Comparison of Nucleon Form Factors from Lattice QCD Against the Light Front Cloudy Bag Model and Extrapolation to the Physical Mass Regime written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We explore the possibility of extrapolating state of the art lattice QCD calculations of nucleon form factors to the physical regime. We find that the lattice results can be reproduced using the Light Front Cloudy Bag Model by letting its parameters be analytic functions of the quark mass. We then use the model to extend the lattice calculations to large values of Q2 of interest to current and planned experiments. These functions are also used to define extrapolations to the physical value of the pion mass, thereby allowing us to study how the predicted zero in GE(Q2)/GM(Q2) varies as a function of quark mass.
Book Synopsis Magnetic Moments of the Nucleon Octet in a Relativistic Light-cone Quark Model by : Zbigniew Dziembowski
Download or read book Magnetic Moments of the Nucleon Octet in a Relativistic Light-cone Quark Model written by Zbigniew Dziembowski and published by . This book was released on 1987 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
