Search for narrow anti NN states in anti pd annihilation. [500 and 610 MeV/c]
Conference
·
OSTI ID:7095266
A p-bard..-->..NX missing-mass epxeriment was performed, and the invariant mass of the system X(p-barp or p-barn) was determined at 500 and 610 MeV/c beam momenta by measurement of the angle and time of flight of the recoiling nucleon. Possible radiative transitions in p-bard..-->..NX..gamma.. were also investigated with a large NaI crystal. For annihilations at rest a 4-standard-deviation upper limit of 0.3% was found for the production of narrow bound states; for annihilations in flight the limit was 2 mb in the mass interval 1650 to 1930 MeV/c/sup 2/ (for isotropic production in the p-bard center-of-mass system). Missing-mass and photon energy distributions are shown. The mean number of photons per annihilation was 2.6 +- 0.3, in agreement with a neutral-to-charged pion ratio of 0.5 predicted by charge independence. 3 figures. (RWR)
- Research Organization:
- New Mexico Univ., Albuquerque (USA); Temple Univ., Philadelphia, PA (USA); California Univ., Irvine (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS02-76ER03539
- OSTI ID:
- 7095266
- Report Number(s):
- CONF-800688--5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTIPROTON-DEUTERON INTERACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
LINEAR MOMENTUM
MASS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 100-1000
MISSING MASS
MISSING-MASS SPECTRA
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-DEUTERON INTERACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PHOTONS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
SPECTRA
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTIPROTON-DEUTERON INTERACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
LINEAR MOMENTUM
MASS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 100-1000
MISSING MASS
MISSING-MASS SPECTRA
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-DEUTERON INTERACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PHOTONS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
SPECTRA