Meson and Baryon Spectroscopy by D.B. Lichtenberg

By D.B. Lichtenberg

This paintings originated in a chain of lectures on meson and baryon ex­ mentioned states which I gave on the Stanford Linear Accelerator heart within the fall of 1962. The notes of those lectures have been issued as a Stanford Uni­ versity file (SLAC-13) in March, 1963. within the fall of 1963, I gave a revised set of lectures on meson and baryon spectroscopy at Indiana collage. In either circumstances, the talks got basically for experi­ psychological physicists. In getting ready the notes of those talks for book, i've got extra a few introductory fabric on pions, nucleons, kaons, and hyperons. My major emphasis is at the experimental evidence in regards to the spectros­ reproduction of the mesons and baryons and at the use of conservation legislation of their interpretation. i've got both pointed out in brief or passed over completely reasons which rely on dynamical types. even supposing i've got given a few evidence in regards to the electromagnetic and vulnerable decays of a few mesons and baryons, i have never mentioned the speculation of those decays. this isn't a complete evaluation of the topic of the strongly interacting debris, and the record of references isn't entire. additionally, i have never consistently committed time to an issue in share to its impor­ tance, yet have spent extra time on themes that have fairly me. however, i'm hoping that i've got supplied an invaluable precis of crucial proof in regards to the spectroscopy of the mesons and baryons.

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WICK, WIGHTMAN, and WIGNER (1952) have called attention to these rules and pointed out the ambiguities in parity and other quantum numbers which follow. Conservation of the two lepton numbers, if exact, lead to two additional superselection rules. Evidence from proton-proton and neutron-proton scattering and from the energy levels of light nuclei shows that the interactions of protons and neutrons are charge independent. The proton and neutron are members of an isospin doublet, the nucleon, with the proton having I, = 1/2 and the neutron having I z = -1/2' Since the proton has Q= 1 and the neutron Q= 0, the nucleon satisfies the Gell-Mann-Nishijima formula (Eq.

Evidence from proton-proton and neutron-proton scattering and from the energy levels of light nuclei shows that the interactions of protons and neutrons are charge independent. The proton and neutron are members of an isospin doublet, the nucleon, with the proton having I, = 1/2 and the neutron having I z = -1/2' Since the proton has Q= 1 and the neutron Q= 0, the nucleon satisfies the Gell-Mann-Nishijima formula (Eq. 1) with hypercharge Y = 1. e. 00001. Since the expected magnetic moment of a Dirac particle (a particle obeying the Dirac equation) is p = 1, the magnetic moment of the proton is often divided into two parts: Pp = 1 + "p where the term 1 is called the Dirac moment and the term "p is called the anomalous or Pauli moment.

Both of these examples are plots of a frequency vs. a single variable of interest. It is possible to obtain more information from the data by means of a plot in which two variables are given simultaneously. Each event is shown as a point on such a two dimensional plot, and information is obtained by observing the density distribution of points. For example, in a three-particle final state, the invariant mass of two of the particles may be plotted against the momentum transfer to the third. See the review of ROSENFELD and HUMPHREY (1963) for a fuller discussion of the analysis of data, especially from bubble chamber pictures.

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