Difference spectra: Dominance of two-body cascades in antiproton-neutron annihilations at rest

Journal Article · Mon Jan 20 04:00:00 EST 1986 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.56.215· OSTI ID:6095310

Bridges, D; Daftari, I; Kalogeropoulos, T E; Debbe, R; Fickinger, W; Robinson, D K

A novel method of analysis which eliminates the combinatorial background in searches for states produced in p-barn annihilations and in association with a recoil ..pi../sup -/ is presented. The difference between ..pi../sup -/ and ..pi../sup +/ spectra on p-barn annihilations is the spectrum of the recoiling ..pi../sup -/ or difference spectrum. We applied this analysis to the exclusive channels p-barn..-->..2..pi../sup -/..pi../sup +/, 2..pi../sup -/..pi../sup +/..pi../sup 0/, 3..pi../sup -/2..pi../sup +/. A new prominent state of mass and width approx. =1480 and 100 MeV/c/sup 2/ is present in the first and dominates the third channel. These three channels are interpreted in terms of two-body intermediate states only. The suppression or absence of ''direct'' annihilation is consistent with theoretical models which view the annihilation as a short-range (0.1 fm) phenomenon.

• Research Organization: Physics Department, Syracuse University, Syracuse, New York 13210
• OSTI ID: 6095310
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 56:3; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645205* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 0-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTIPROTON-NEUTRON INTERACTIONS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
BUBBLE CHAMBERS
CASCADE THEORY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
GAS TRACK DETECTORS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
ISOSPIN
MASS SPECTRA
MATHEMATICAL MODELS
MATHEMATICAL SPACE
MEASURING INSTRUMENTS
MESONS
MONTE CARLO METHOD
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHASE SPACE
PIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RECOILS
SPACE
SPECTRA
STATISTICAL MODELS