[en] The topics covered include an historical survey, classical concepts and conservation laws, particles, antiparticles, and fields, nonclassical conservation laws, and superposition and interference. (JFP)

[en] It is shown that the variety of the known stable elementary particles can be presented as a variety of conserved quantities and their combinations. Energy, momentum and angular momentum are used as conserved quantities. To aid the description, elementary particles and conserved quantities are represented by geometrical symbols (polar vector, axial vector, scalar, pseudoscalar, etc.). The possibility of finding new elementary particles is indicated as well as the peculiarities of the properties of those already known (existence of intrinsic momentum, its spatial quantatization, etc.). The paper discusses also the specifics of the particle-antiparticle concept and some questions related to the problem of invariance. (author)

[en] Published in summary form only

[en] In this paper, the authors consider a field theory based on the bilinear q-mutator relations and continuously transforming into the usual theory. For the free field the authors show that the violations of usual (Fermi- or Bose-) statistics even within this slightly nonlocal theory are incompatible with the existence of antiparticles and the positive definiteness of norms of the state vectors in the Fock representation

[en] In the standard model lepton number violating processes are forbidden, but are allowed in many extensions to it. Muonium to antimuonium conversion has been explicitly allowed in the framework of left-right-symmetric models or in supersymmetric models. A new experiment at PSI has demonstrated its ability to improve the sensitivity to such a rare process significantly. copyright 1995 American Institute of Physics

[en] The gravitational force acting on antiparticles has never been directly measured to date. A method for measuring the gravitational effects on antihydrogen by equilibrating the gravitational force with a magnetic gradient is discussed. The systematic and statistical errors inherent to the measurement will be presented. It will be shown that a measurement of gravity at 1% can be realised using ∼ 5 x 10⁵ antihydrogen atoms. The production of antihydrogen atoms in conditions suitable for the measurement is also discussed

[en] To the special curiosities in nature belongs the antimatter. Thought is by this the surprising phenomenon that to each of the elementary particles known by us a counterpart, an antiparticle, exists and that particles and antiparticles decay in their collisions into an energy flash. Does therefore also an antiworld exist, a cosmos, which equals to our in all exactly, except that it consistent even of antimatter? This book describes the history and central aspects of this especially fascinating field of physics and explains the far reaching consequences of the hitherto research results

[en] The minute yet effective impact of gravitational potential in the central region of a long tube magnetic container of non-neutral plasmas can be utilized for the measurement of the gravitational acceleration of antimatter particles. The slight change in distribution of plasma particles along the gravitational field affects the internal electric field of the plasma, which in turn affects the frequency of the magnetron motion of its particles. Thus, a rather straightforward relation is established between the gravitational acceleration of the particles and their magnetron frequencies, which is measurable directly, determining the value of the gravitational acceleration. (author). 7 refs, 3 figs

[en] Bergson and Whitehead have proposed a point of view where events rather than particles are fundamental entities. It is followed this point of view as developed further by Capek and by Stapp by suggesting a framework in which fundamental events are taken to be point-like entities which interact with other fundamental events. Different kinds of fundamental events are to be distinguished by the rules of interaction. Examples of simple rules of interaction are given which lead to propagating patterns of events that can be interpreted as particles. The particles exhibit a wave structure and possess invariants, quantum numbers and quarklike constituents. They can react with each other and decay to form other particles, including antiparticles. A relativistic space-time co-ordinate system appears to be a natural way of organizing the event pattern. It is argued that this kind of framework can provide a basis for unifying the concepts of quantum mechanics, elementary-particle structure and relativity

No abstract available