Helicity Amplitudes for Photoproduction of Baryons with J
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Published: 2007
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DOWNLOAD EBOOKWe study the photoproduction helicity amplitudes of negative parity baryons in the context of the 1/Nc expansion of QCD. A complete analysis to next-to-leading order is carried out. The results show sub-leading effects to be within the magnitude expected from the $1/N_c$ power counting. They also show significant deviations from the quark model, in particular the need for 2-body effects.
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Published: 2006
Total Pages: 62002
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DOWNLOAD EBOOKWe analyze the photoproduction helicity amplitudes for non-strange positive parity excited baryons in the context of the 1/N{sub c} expansion of QCD. Our results strongly suggest that, although one-body transition operators provide the dominant contributions, two-body transition operators are definitely required in order to get good fits to the presently known empirical amplitudes. The significance of this result for quark model calculations is briefly discussed.
Author: A. V. Anisovich
Publisher: World Scientific
Published: 2008
Total Pages: 603
ISBN-13: 9812818251
DOWNLOAD EBOOKThis book is devoted to the investigation of the strongly interacting hadrons ? to a quark model operating with effective color particles, constituent quarks, massive effective gluons and diquarks. The study of strong interactions based on effective constituent particles requires a solid ground of experimental data, which we now have at our disposal with the serious progress made in the investigation of hadrons, especially meson states.The present understanding of QCD applied to strong interactions can be distorted by prejudices. Therefore, the way followed by the quark model is to rely on the experiment and to restore the effective Hamiltonian on the basis of QCD on the one hand, and, on the other, of the spectral integral method.Baryon-baryon and antibaryon-baryon interactions are studied with the purpose of unambiguous applications of the written formulae to the interpretation of experimental data ? to the observation of new meson and baryon resonances. The technique used is the spin-orbital momentum expansion of the amplitude. This method is our basic approach to the proper treatment of experimental data. The photon-induced reactions are also considered and the problem of form factors is discussed.
Author: Moshe Gai
Publisher: World Scientific
Published: 1993-03-24
Total Pages: 506
ISBN-13: 9814554219
DOWNLOAD EBOOKThis book covers major themes in the spectroscopy of baryons, some light mesons, and involves some limited discussion of baryons in nuclei. A comprehensive review of theoretical models is included. All currently operating accelerator facilities and future facilities of the 1990s are reviewed, with experimental programs discussed in detail.
Author: Sigfrido Boffi
Publisher: World Scientific
Published: 1995-02-22
Total Pages: 598
ISBN-13: 9814551759
DOWNLOAD EBOOKA series of new and relevant experimental results are here presented to the community for the first time. In particular, we refer to the measurement of the neutron spin structure functions by the SLAC (E142) and CERN (SMC) collaborations; the first results from MAMI on experiments with tagged photons (A1 collaboration), on electroproduction of multi-hadron final states (A2 collaboration) and the neutron form factor (A3 collaboration); the experiments on strangeness photoproduction at ELSA; the polarization experiments at Bates on the neutron form factor and nuclear response functions and the photon and electron scattering data obtained by the Genova-Frascati Jet Target collaboration.Focused on the study of spin observables and exclusive processes at high momenta, the following sessions were held: The Neutron Form Factors; Spin Structure Functions; Exclusive Processes at High υ and Q2. Deep Inelastic Scattering; Spin Observables; One- and Two-Nucleon Knockout at Low and Intermediate Energies; Excitation of Baryons Resonances and Strangeness.
Author: Benjamin F Gibson
Publisher: World Scientific
Published: 1996-09-20
Total Pages: 614
ISBN-13: 9814547670
DOWNLOAD EBOOKThe conference focused on the current status of baryon spectroscopy, form factors and structure functions, electroweak interactions and symmetries, strange and exotic states, chiral perturbation theory, heavy quark physics, and medium modifications, through plenary session summaries and reviews and parallel session reports of recent experimental and theoretical advances. Plans for future facilities and upgrades were highlighted in special plenary sessions.
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Published: 1975-04
Total Pages: 1082
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Published: 1973
Total Pages: 1162
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DOWNLOAD EBOOKAuthor: United States. Energy Research and Development Administration
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Published: 1977
Total Pages: 900
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