Spin-Parity Analysis of theA3

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Abstract

A partial-wave analysis of the charged three-pion system in the reaction π−p→pπ+π−π− for incident π− momenta from 5 to 25 GeV/c shows the existence of a broad enhancement (∼ 300 MeV) in the JP=2−fπ (S-wave) state in the region of the A3(1650). No other state (J≤4) shows structure in this region. Upper bounds for ρπ and επ decay modes of the A3 are given. The interference of the 2−fπ (S-wave) amplitude with other amplitudes has been observed. The mass variation of the phase of the 2−fπ (S-wave) amplitude measured with respect to the phases of other amplitudes does not show the behavior expected for the relative phase between resonant and nonresonant amplitudes. Results are given on the polarization and momentum-transfer dependence of the A3 and on the A3 production cross section as a function of incident π− momentum.Received 17 July 1972DOI:https://doi.org/10.1103/PhysRevD.7.669©1973 American Physical Society

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