scholarly journals Mütter und Schilling: Current Topics in Elementary Particle Physics/Gräff, Klempt und Werth: Present Status and Aims of Quantum Electrodynamics/Adam: Color Measurement/Härtel: Zur Didaktik der Physik und Chemie/Weigert und Wendker: Astronomie und Astrophy

1982 ◽  
Vol 38 (9) ◽  
pp. 299-301
Author(s):  
G. Schierholz ◽  
E. Lohrmann ◽  
M. Krystek ◽  
K. Weltner ◽  
W. Deinzer ◽  
...  
Keyword(s):  
Elementary Particle ◽  
Present Status ◽  
Quantum Electrodynamics ◽  
Particle Physics ◽  
Color Measurement ◽  
Elementary Particle Physics

The present status of quarks and leptons

1986 ◽  
Vol 404 (1827) ◽  
pp. 153-166
Keyword(s):  
Elementary Particle ◽  
Present Status ◽  
Particle Physics ◽  
Pauli Principle ◽  
Elementary Particles ◽  
Elementary Particle Physics ◽  
Strongly Interacting

Historically the search for the fundamental elements of matter has exhibited a recurring theme. Patterns are discerned that hint at substructure in the elements, and then scattering reveals the new layer of elementarity. A force is identified that binds the new constituents to build up the old ‘elements’ as compounds. The Pauli principle is crucial in limiting the possible structures. This is familiar for the atomic elements; it is also true for the strongly interacting ‘elementary particles’ built from quarks. These avenues are examined for hadrons, and evidence for quarks, gluons, and colour forces will be reviewed. The theme illustrates how the arena of elementary particle physics has progressed from hadrons to quarks and leptons.

scholarly journals Dynamical Symmetries of the H Atom, One of the Most Important Tools of Modern Physics: SO(4) to SO(4,2), Background, Theory, and Use in Calculating Radiative Shifts

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1323 ◽  
Author(s):  
G. Jordan Maclay
Keyword(s):  
Hydrogen Atom ◽  
Quantum Electrodynamics ◽  
Particle Physics ◽  
Bound States ◽  
Integrated Treatment ◽  
Invariance Group ◽  
Elementary Particle Physics ◽  
Background Theory ◽  
Modern Physics ◽  
History Of

Understanding the hydrogen atom has been at the heart of modern physics. Exploring the symmetry of the most fundamental two body system has led to advances in atomic physics, quantum mechanics, quantum electrodynamics, and elementary particle physics. In this pedagogic review, we present an integrated treatment of the symmetries of the Schrodinger hydrogen atom, including the classical atom, the SO(4) degeneracy group, the non-invariance group or spectrum generating group SO(4,1), and the expanded group SO(4,2). After giving a brief history of these discoveries, most of which took place from 1935–1975, we focus on the physics of the hydrogen atom, providing a background discussion of the symmetries, providing explicit expressions for all of the manifestly Hermitian generators in terms of position and momenta operators in a Cartesian space, explaining the action of the generators on the basis states, and giving a unified treatment of the bound and continuum states in terms of eigenfunctions that have the same quantum numbers as the ordinary bound states. We present some new results from SO(4,2) group theory that are useful in a practical application, the computation of the first order Lamb shift in the hydrogen atom. By using SO(4,2) methods, we are able to obtain a generating function for the radiative shift for all levels. Students, non-experts, and the new generation of scientists may find the clearer, integrated presentation of the symmetries of the hydrogen atom helpful and illuminating. Experts will find new perspectives, even some surprises.

Notes on Elementary Particle Physics

1972 ◽  
Vol 40 (11) ◽  
pp. 1720-1721
Author(s):  
H. Muirhead ◽  
Richard A. Morrow
Keyword(s):  
Elementary Particle ◽  
Particle Physics ◽  
Elementary Particle Physics
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