Natural parity resonances in eta pi(+)pi(-)

Citation
D. Amelin et al., Natural parity resonances in eta pi(+)pi(-), NUCL PHYS A, 668(1-4), 2000, pp. 83-96
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
668
Issue
1-4
Year of publication
2000
Pages
83 - 96
Database
ISI
SICI code
0375-9474(20000327)668:1-4<83:NPRIEP>2.0.ZU;2-R
Abstract
Results of a partial wave analysis of the eta pi(+) pi(-) final state are p resented using 4.2 x 10(4) events with \t\ < 0.2 GeV2, collected at the VES setup; the reaction is pi(-)p-->pi(-)pi(+) eta n from a beryllium target. The data reveal resonant structures, which are identified by phase motion a s well as peaks in intensities of partial waves. The f(2)(1565) meson, also called the AX meson, is observed in decays to [a(2)(1302)pi](L=1). The par ameters obtained from a fit With a Breit-Wigner amplitude are M = 1550 +/- 20 MeV with Gamma= 130 +/- 40 MeV. The higher mass f(2), resonances are als o discussed. For J(P) = 3(-), the well known rho(3)(1690) is seen in decays to both a(2)(1320)pi and rho eta channels. The complex behaviour of 3(--) amplitudes at higher masses is described best by introducing two additional resonant poles near 2.14 and 2.30 GeV. There is evidence for an f(4)(2300) meson, decaying dominantly to [f(2)eta](L=3). (C) 2000 Elsevier Science B. V. All rights reserved.