Structures revealed in p-p and p-n scattering experiments and dibaryon resonances
A striking energy dependence has been observed in the difference between the p-p total cross sections for parallel and antiparallel longitudinal spin states, ..delta..sigma/sub L/ = sigma/sup Tot/(reversible) - sigma/sup Tot/(reversible). The structure lab/appears around p/sub lab/ = 1.5 GeV/c where ..delta..sigma/sub L/ = -16.7 mb and is seen in sigma/sup Tot/(reversible) rather than sigma/sup Tot/(reversible). The experiments were performed at Argonne National Laboratory using a standard transmission technique. From the dispersion analysis of a forward p-p scattering amplitude using the data on ..delta..sigma/sub L/, Grein and Kroll have shown that the Argand plot of the amplitude has a clear resonance-like behavior around proton-incident momentum of 1.5 GeV/c. At the same energy range, the p-p polarization at fixed -t also shows a remarkable energy dependence. In addition, a prominent energy dependence was observed for C/sub LL/ = (L,L;0,0), the spin correlation parameter for elastic pp scattering with beam and target both longitudinally polarized. The possibility of a resonance was further pursued by studying Legendre expansion coefficients of p-p differential cross section and polarization data. The analysis showed a partial wave, /sup 3/F/sub 3/ consistent with having a resonant behavior. Based on a phase-shift analysis, Hoshizaki also showed that /sup 3/F/sub 3/ seems to resonant. This resonant state would have the quantum number J/sup P/ = 3/sup -/, mass approx. 2260 MeV, width approx. 200 MeV and elasticity 20 to 30%. This exotic state may be described by the MIT bag model. Also speculated are several more diproton (I = 1) and dinucleon (I = 0) resonances in the mass region 2100 to 2800 MeV. 35 references.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5909053
- Report Number(s):
- ANL-HEP-CP-79-20
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR MOMENTUM
BAG MODEL
BARYON RESONANCES
BARYON-BARYON INTERACTIONS
BARYONS
COMPOSITE MODELS
CORRELATIONS
CROSS SECTIONS
DATA
DATA FORMS
DIBARYON RESONANCES
DIFFERENTIAL CROSS SECTIONS
DISPERSION RELATIONS
ELASTIC SCATTERING
ELASTICITY
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
EXPERIMENTAL DATA
EXTENDED PARTICLE MODEL
FERMIONS
FUNCTIONS
GRAPHS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
LEGENDRE POLYNOMIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARITY
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PHASE SHIFT
POLARIZATION
POLYNOMIALS
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUARK MODEL
RESONANCE PARTICLES
SCATTERING
SCATTERING AMPLITUDES
SPIN
TENSILE PROPERTIES
TOTAL CROSS SECTIONS