Document Type
Article
Publication Date
1-20-1986
Abstract
A novel method of analysis which eliminates the combinatorial background in searches for states produced in p¯n annihilations and in association with a recoil π- is presented. The difference between π- and π+ spectra on p¯n annihilations is the spectrum of the recoiling π- or difference spectrum. We applied this analysis to the exclusive channels p¯n→2π-π+, 2π-π+π0, 3π-2π+. A new prominent state of mass and width ≃1480 and 100 MeV/c2 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.
Publication Title
Physical Review Letters
Rights
©1986 American Physical Society
Recommended Citation
D. Bridges, I. Daftari, T. E. Kalogeropoulos, R. Debbe, W. Fickinger, and D. K. Robinson. Difference spectra: Dominance of two-body cascades in antiproton-neutron annihilations at rest. Phys. Rev. Lett. 56, 215, 20 January 1986