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Published: 2007
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DOWNLOAD EBOOKThe decays of excited baryons are analyzed using the 1/Nc expansion of QCD. These studies are performed up to order 1/Nc, and include positive and negative parity states.
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Published: 2005
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DOWNLOAD EBOOKThe decays of non-strange positive parity baryons via emission of a pseudo-scalar meson are studied in the framework of the 1/Nc expansion to order 1/Nc. In particular, the pionic decays of the l=0 Roper baryons and of the l=2 baryons in the mass interval 1680-1950 MeV are analyzed using the available partial decay widths. Decay widths by emission of an eta meson are shown to be suppressed by a factor 1/Nc2 with respect to the pionic ones.
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Published: 2010
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DOWNLOAD EBOOKThe $1/N_c$ expansion of QCD provides a useful framework for phenomenological studies of both ground state and excited baryons. Here, we focus on its application to the excited baryon strong decays via emission of single pseudoscalar meson. The S- and D-wave decay amplitudes of the negative parity baryons in the $[70,1^-]$ of $SU(6)$ are analyzed to subleading order in $1/N_c$ and to first order in SU(3) symmetry breaking. In particular, the SU(3) symmetry breaking is studied in detail through SU(3) breaking decay operators and state mixing.
Author: Richard F. Lebed
Publisher: World Scientific
Published: 2002
Total Pages: 321
ISBN-13: 9812776915
DOWNLOAD EBOOKThe generalization of QCD from three to N C colors, developed in 1974 by Nobel laureate Gerard ''t Hooft, has proved to be an extraordinarily useful and robust theoretical extension for studying the behavior of strong interaction physics. This book is the proceedings of the first-ever meeting exclusively devoted to large N C QCD. The workshop brought together representatives of many subdisciplines for a OC meeting of mindsOCO on topics ranging from finite temperature and density to the lattice, perturbative QCD, instantons, mesons, baryons, and nuclear physics. Beginning with ''t Hooft''s keynote presentation, the contributions are designed to introduce uses of large N C methods in each specialty to a broader particle physics audience."
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Published: 2004
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DOWNLOAD EBOOKA brief overview of the 1/N{sub c} expansion in the baryon sector is given, with emphasis on recent analyses of masses and decays of excited baryons.
Author: Jose Luis Goity
Publisher: World Scientific
Published: 2005-08-04
Total Pages: 319
ISBN-13: 9814479896
DOWNLOAD EBOOKThe large Nc limit plays a fundamental role in the study of non-abelian gauge theories such as quantum chromodynamics (QCD). Since its discovery in 1974 by 't Hooft, the 1/Nc expansion has provided crucial insights into the non-perturbative aspects of gauge theories. The expansion implemented at the effective theory level is one of the fundamental tools currently in use in hadronic physics; there are important effects and relations that follow from the 1/Nc expansion, which held remarkably well in the real world with Nc= 3. The 1/Ncexpansion also plays a central role in the recently discovered connections between non-Abelian gauge and string theories, promising new ways to analyze the non-perturbative domain of gauge theories.This volume contains contributions from leading theorists and covers the recent developments in the 1/Nc expansion in QCD. The topics addressed include confinement, AdS/CFT correspondence and the string-QCD connection, topology in large Nc, lattice QCD, and a variety of applications to mesons and baryons.
Author: Jan C. A. Boeyens
Publisher: Springer Science & Business Media
Published: 2007-12-05
Total Pages: 380
ISBN-13: 1402066600
DOWNLOAD EBOOKThis book presents a fully scientific account of the use of the golden ratio. It explores the observation that stable nucleides obey a number theory based general law. The discovery described in this book could be of seminal significance, also in other fields where the golden ratio is known to be of fundamental importance.
Author: Antonio Dobado
Publisher: Springer Science & Business Media
Published: 2008-11-07
Total Pages: 615
ISBN-13: 3540725164
DOWNLOAD EBOOKThe QNP series of international conferences on Quarks and Nuclear Physics is by now a well established and highly respected forum where the most recent developments in the field are discussed and communicated. QNP 2006 is the forth edition of this biennial meeting. Selected and refereed original contributions of QNP 2006 have been published in The European Physical Journal A - Hadrons and Nuclei (EPJ A), while the present proceedings book, in addition to reprinting the articles published in EPJ A, further includes all other contributions selected and accepted by the organizing committee for publication and archiving.
Author: Kurt Gottfried
Publisher: Oxford University Press
Published: 1986-11-13
Total Pages: 437
ISBN-13: 0195365275
DOWNLOAD EBOOKThe second volume of this authoritative work traces the material outlined in the first, but in far greater detail and with a much higher degree of sophistication. The authors begin with the theory of the electromagnetic interaction, and then consider hadronic structure, exploring the accuracy of the quark model by examining the excited states of baryons and mesons. They introduce the color variable as a prelude to the development of quantum chromodynamics, the theory of the strong interaction, and go on to discuss the electroweak interaction--the broken symmetry of which they explain by the Higgs mechanism--and conclude with a consideration of grand unification theories.
Author: D.B. Lichtenberg
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 157
ISBN-13: 146159636X
DOWNLOAD EBOOKThis work originated in a series of lectures on meson and baryon ex cited states which I gave at the Stanford Linear Accelerator Center in the fall of 1962. The notes of these lectures were issued as a Stanford Uni versity report (SLAC-13) in March, 1963. In the fall of 1963, I gave a revised set of lectures on meson and baryon spectroscopy at Indiana University. In both cases, the talks were given primarily for experi mental physicists. In preparing the notes of these talks for pUblication, I have added some introductory material on pions, nucleons, kaons, and hyperons. My main emphasis is on the experimental facts concerning the spectros copy of the mesons and baryons and on the use of conservation laws in their interpretation. I have either mentioned briefly or omitted entirely explanations which depend on dynamical models. Although I have given a number of facts about the electromagnetic and weak decays of some mesons and baryons, I have not discussed the theory of these decays. This is not a comprehensive review of the subject of the strongly interacting particles, and the list of references is not complete. Also, I have not always devoted time to a subject in proportion to its impor tance, but have spent more time on topics which have particularly interested me. Nevertheless, I hope that I have provided a useful summary of the most important facts about the spectroscopy of the mesons and baryons.
