A precision test of charge independence of Hadronic interactions
Abstract
Broken symmetries are among the richest sources of information about the fundamental interactions: the renewed interest in the study of isospin nonconservation by strong forces is closely related to the effort of understanding some properties of nuclear systems in terms of their basic degrees of freedom. The hope is to be able to relate the pattern of the dynamical breaking of this symmetry to the mass spectrum of light quarks: to this purpose a more detailed phenomenological knowledge must be provided by a new generation of experiments. A high precision test of charge independence of strong nuclear interactions was performed through the measurement of the ratio, R between the differential cross sections and the difference delta A(y0) between analyzing powers for the two reactions p + d yields H3 + pi(+) and p + d yields He3 + pi(0). The observable delta A(y0) is particularly relevant as it probes the spin dependent term of the symmetry breaking interaction, on which almost no empirical evidence is available. The experiment was performed using the Ntype polarized proton beam (T sub p = 733 MeV), and detecting the charged heavy particle in the HRS magnetic spectrometer. The result for R is almost an order of magnitude more precise than previous measurements, and the measurements for delta A(y0) have errors less than +/ 0.005, or approximately 1%.
 Publication:

Ph.D. Thesis
 Pub Date:
 October 1986
 Bibcode:
 1986PhDT........11A
 Keywords:

 Broken Symmetry;
 Deuterons;
 Hadrons;
 High Energy Interactions;
 Protons;
 Strong Interactions (Field Theory);
 Error Analysis;
 Particle Production;
 Particle Spin;
 Pions;
 Atomic and Molecular Physics