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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Recent progress in baryon spectroscopy is reviewed. In a common effort, various groups have analyzed a set of new high-precision polarization observables from ELSA. The Julich-Bonn group has finalized the analysis of pion-induced meson-baryon production, the potoproduction of pions and eta mesons, and (almost) the K[Lambda] final state. Lastly, as data become preciser, statistical aspects in the analysis of excited baryons become increasingly relevant and several advances in this direction are proposed.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Recent progress in baryon spectroscopy is reviewed. In a common effort, various groups have analyzed a set of new high-precision polarization observables from ELSA. The Julich-Bonn group has finalized the analysis of pion-induced meson-baryon production, the potoproduction of pions and eta mesons, and (almost) the K[Lambda] final state. Lastly, as data become preciser, statistical aspects in the analysis of excited baryons become increasingly relevant and several advances in this direction are proposed.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A short review of current efforts to determine the highly excited state spectrum of QCD, and in particular baryons, using lattice QCD techniques is presented. The determination of the highly excited spectrum of QCD is a major theoretical and experimental challenge. The experimental investigation of the excited baryon spectrum has been a long-standing element of the hadronic-physics program, an important component of which is the search for so-called 'missing resonances', baryonic states predicted by the quark model based on three constituent quarks but which have not yet been observed experimentally. Should such states not be found, it may indicate that the baryon spectrum can be modeled with fewer effective degrees of freedom, such as in quark-diquark models. In the past decade, there has been an extensive program to collect data on electromagnetic production of one and two mesons at Jefferson Lab, MIT-Bates, LEGS, MAMI, ELSA, and GRAAL. To analyze these data, and thereby refine our knowledge of the baryon spectrum, a variety of physics analysis models have been developed at Bonn, George Washington University, Jefferson Laboratory and Mainz. To provide a theoretical determination and interpretation of the spectrum, ab initio computations within lattice QCD have been used. Historically, the calculation of the masses of the lowest-lying states, for both baryons and mesons, has been a benchmark calculation of this discretized, finite-volume computational approach, where the aim is well-understood control over the various systematic errors that enter into a calculation; for a recent review. However, there is now increasing effort aimed at calculating the excited states of the theory, with several groups presenting investigations of the low-lying excited baryon spectrum, using a variety of discretizations, numbers of quark flavors, interpolating operators, and fitting methodologies. Some aspects of these calculations remain unresolved and are the subject of intense effort, notably the ordering of the Roper resonance in the low-lying Nucleon spectrum.
Author: Simon Capstick Publisher: World Scientific ISBN: 9812568395 Category : Science Languages : en Pages : 450
Book Description
This volume brings together experts on the quark-gluon structure of matter as it applies to nucleon resonance physics. The contributions discuss the latest findings in areas such as meson production via electromagnetic and hadronic reactions, baryon resonance structure in chiral and lattice QCD approaches, and the extraction of resonance parameters from coupled-channels analysis of data.
Author: Moshe Gai Publisher: World Scientific ISBN: 9814554219 Category : Languages : en Pages : 506
Book Description
This 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: M J Vicente-vacas Publisher: World Scientific ISBN: 9814555916 Category : Languages : en Pages : 730
Book Description
The proceedings reflect the recent experimental and theoretical progress in pion nuclear physics in topics like pionic atoms, pion absorption, charge exchange, (π, 2π), and others involving pions in nuclei using different probes, as electron photons or heavy ions. Related topics on chiral symmetry, low energy πN and (γ, π⁰) and quark degrees of freedom are also addressed.
Author: Harry Tsung-shung Lee Publisher: World Scientific ISBN: 981454616X Category : Languages : en Pages : 358
Book Description
It has been well recognized that the study of the excitations of the nucleon can shed light on the nonperturbative aspects of QCD. New opportunities for such study will be opened in the next few years with the commissioning of experiments in Hall B of the Continuous Electron Beam Accelerator Facility (CEBAF) at the Thomas Jefferson National Accelerator Facility (JLab). Photo- and electroproduction studies of single and double pions, rhos, omegas, and kaons will be conducted with unprecedented precision. The Hall B CLAS detector is a major step forward, promising to provide kinematically complete measurements of cross sections and spin observables. The task of extracting new insights from such detailed measurements will require close coordination between experimental and theoretical physicists.To help optimize this interface between theory and experiment, a joint CEBAF/INT workshop was held at the Institute of Nuclear Theory in Seattle, September 9-13, 1996. The foci of the 1996 workshop included: N → N∗ transition form factors as predicted by QCD-inspired models and their experimental consequences; theoretical techniques employing QCD sum rules, perturbative QCD, and lattice QCD; reaction theories of photo- and electro-production of mesons; theoretical issues in the eta meson, vector meson, and two-pion production channels; progress in developing amplitude analyses for the available and expected data; the relationship between the Hall B program and those of other new experimental facilities.This proceeding will serve readers as both a current perspective on the field and a guide to future experimental and theoretical research directions.
Author: Bernhard Mecking Publisher: World Scientific ISBN: 9814485675 Category : Science Languages : en Pages : 705
Book Description
This book deals with the latest developments in the area of three-quark systems. Emphasis is given to the discussion of new experimental results in the areas of form factors, unpolarized and polarized structure functions, and baryon structure and spectroscopy. Of particular interest are the new theoretical developments in the area of generalized parton distributions and lattice quantum chromodynamics.
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Author: Simon Capstick
Author: Topical Conference on Baryon Resonances
Author: Moshe Gai
Author: Benjamin F. Gibson
Author: M J Vicente-vacas
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Author: Harry Tsung-shung Lee
Author: Bernhard Mecking