Abstract
Diffractive production of π- π- π+ and π- π0 π0 final states is the subject of comprehensive studies performed recently by the VES and the COM-PASS experiments. COMPASS pioneered the application of novel methods of partial-wave analysis: mass-independent PWA inmultiple (m3π, t’)-cells, mass-dependent analysis of spin-density matrices performed simultaneously in all measured t’ bins, the analysis with freed shapes of π+ π- isobars. In addition, COMPASS observed a new narrow state: a1(1420). VES has world-leading data samples on π- π- π+ and π- π0 π0, that yield compatible results and show the potential for a detailed comparison of isospin relations between different decay channels, using the PWA methods with fixed and freed shapes of ππ isobars.
Highlights
The diffractive production of 3π states is currently the subject of detailed studies by the VES [1] and the COMPASS [2] experiments
We compare for the first time the mass-independent partial-wave analysis (PWA) results for the π−π−π+ and π−π0π0 final states that were obtained by the VES and COMPASS experiments
The intensities of 3 dominant partial waves exhibit the isospin relations between π−π−π+ and π−π0π0, that are expected for the isobar model
Summary
The diffractive production of 3π states is currently the subject of detailed studies by the VES [1] and the COMPASS [2] experiments. VES reported preliminary results on a resonance-model fit of the π−π0π0 data [5, 8] A partial-wave analysis (PWA) with freed π0π0 S -wave isobar amplitudes of the π−π0π0 data [8].
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