Physics with ETA mesons
Since the advent of pion factories, an impressive amount of information about the nuclear dynamics of the ..delta..(1232) pion- nucleon resonance has been obtained. The study of this isospin-3/2 resonance has greatly benefited from the fact that ..pi../sup /minus//n and ..pi../sup +/p systems are pure I = 3/2 states, which couple only to the ..delta.. in the resonance region. Such isospin selectivity of the pion does not exist, however, for the I = 1/2 N* resonances because it is not possible to form a pure I = 1/2 state with a pion and a nucleon. Eta mesons have zero isospin. Consequently, the /eta/N systems are in a pure I = 1/2 state, and /eta/ can be used to tag those N* resonances to which it strongly couples. We will briefly review the ..pi..N interaction from the threshold region to c.m. energy ..sqrt..s approx. =1600 MeV. We shall see how improved ..pi..N data can help the study of ..pi..N interactions. I shall discuss what new information about the hadronic interaction can be learned from the study of eta production in pp collisions. The behavior of eta meson in nuclei will be discussed. The interesting question of the quark structure of /eta/(549) and /eta/'(958) will also be discussed within the framework of a simple model. 19 refs., 13 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5897887
- Report Number(s):
- LA-UR-89-1751; CONF-8904233-1; ON: DE89012582
- Resource Relation:
- Conference: Symposium on pion-nucleon and nucleon-nucleon physics, Leningrad, USSR, 22 Apr 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ETA MESONS
PARTICLE PRODUCTION
MESON-NUCLEON INTERACTIONS
BINDING ENERGY
BRANCHING RATIO
CROSS SECTIONS
DELTA-1232 BARYONS
ISOSPIN
MULTIPLICITY
N BARYONS
NUCLEON-NUCLEON INTERACTIONS
PHASE SHIFT
PION-NUCLEON INTERACTIONS
QUARK MODEL
WAVE FUNCTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
COMPOSITE MODELS
DELTA BARYONS
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MESON-BARYON INTERACTIONS
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties