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The decay rates of ω → 3 π , η → π + π - γ , X 0 → π + π - γ , η → π 0 γ γ , and X 0 → π 0 γ γ are calculated using a chiral Lagrangian model suggested previously. The effects of the contact interaction and the σ -pole terms in these decay modes are studied in detail.
The mass shifts of the K S meson are calculated in a multichannel N D - 1 formalism by considering coupling of the K S meson to both the I = 0 and I = 2 ( J = 0 ) π π states. A pole approximation is used for the weak coupling of the K S meson to the π π channel. The results for the coupling...
The Frautschi-Margolis version of the Regge eikonal model is extended to include secondary Regge trajectories. Physical properties of the model are discussed. In particular, the "shrinkage" of d σ dt observed at present energies (rapid shrinkage for pp and K + p , little or no shrinkage for π...
We discuss various theoretical models for the production of quarks at ultrahigh energy. In particular, a well-defined temperature model (suggested by Yang sometime back) is used to illustrate the type of production cross section expected in this picture for a given quark mass and c.m. energy.
There is a well-known forward peak in the np forward charge-exchange cross section, for momentum transfers | t | ≲ m π 2 . We have performed an experiment to look for analogous behavior in the reaction p ¯ p → n ¯ n . The data cover the kinematical region 0 ≤ | t | ≤ 1.5 m π 2 at an...
The total cross section for the multiperipheral model is obtained by solving a Bethe-Salpeter equation. We show that the N -particle production cross sections are given directly in terms of the eigenvalues and eigenfunctions of this Bethe-Salpeter equation, and hence are directly related to the...
We consider a mechanism for generating a nonsense wrong-signature fixed pole in the scattering amplitude based on a certain class of Feynman diagrams. We show that the presence of a fixed pole in the Reggepole residue is expected when we include an effect of the third double-spectral function in...
The K + and K - total cross sections were measured on both hydrogen and deuterium at a series of momenta between 360 MeV/ c and 720 MeV/ c by the transmission method. The data were corrected for Coulomb and decay effects, and the isospin states were extracted. The K + N , I = 0 cross section was...
Results of a measurement of the π - p charge-exchange process at backward angles are presented. Differential cross sections were measured in the angular region - 0.5 < cos θ * < - 1.0 at incident momenta of 2, 3, 4, 5, and 6 GeV/ c . An additional background subtraction to a version of the data...
Using the algebra of currents and current divergences derived from the chiral SU ( 3 ) symmetry-breaking model of Gell-Mann, Oakes, and Renner and a method of pole and cut dominance, we derive two-parameter effective-range formulas for scalar ( I = J = 1 2 ) K π and ( I = J = ) π π form...
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