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Title: Study of the reaction π–A π{sup +}π{sup –}π{sup –}A at large statistics with VES setup

Partial wave analysis of the π–A π{sup +}π{sup –}π{sup –} system produced by 29 GeV/cπ{sup –} beam on a beryllium target is presented. About 30 × 10{sup 6} vertical bar events in the wide t′ vertical bar range 0–0.8 GeV{sup 2}/c{sup 2} are collected with upgraded VES setup. The size of the data sample is 2.5 times larger than one previously analyzed by VES. Data are analyzed using formalism of the density matrix with unlimited rank. We discuss status of the a{sub 1}(1420) a{sub 2}(1700) a{sub 3}(1875) states and a structure of exotic ρ(770)π P-wave with J{sup PC} = 1{sup -+}. Parameters of a{sub 3}(1875) are estimated as M = 1985 ± 20 MeV/c{sup 2}, Γ = 200 ± 50 MeV/c{sup 2} (preliminary)
Authors:
; ; ; ; ; ; ; ; ;  [1] ;  [2] ; ; ; ; ; ; ;  [1]
  1. IHEP (Russian Federation)
  2. Helmholtz-Institut fur Strahlenund Kernphysik (Germany)
Publication Date:
OSTI Identifier:
22471861
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 78; Journal Issue: 13; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; A2-1320 MESONS; BERYLLIUM 9 TARGET; DENSITY MATRIX; GEV RANGE; MEV RANGE; P WAVES; PION REACTIONS; PIONS MINUS; PIONS PLUS; RHO-770 MESONS