OBSERVATION OF THE A(4)(0) MESON IN THE ETA-PI(0) DECAY CHANNEL

Authors
DONSKOV SV INYAKIN AV KACHANOV VA KHAUSTOV GV KOLOSOV VN KONDASHOV AA KULIK AV LANDSBERG GL LEDNEV AA LISHIN VA POLOVNIKOV SA POLYAKOV VA PROKOSHKIN YD SADOVSKY SA SAMOYLENKO VD SHAGIN PM SHTANNIKOV AV SINGOVSKY AV SOBOL AE SUGONYAEV VP BRICMAN C STROOT JP GOUANERE M PEIGNEUX JP POULET M ALDE D KNAPP EA INABA S KINASHI T KOBAYASHI M TAKAMATSU K TSURU T BINON F NAKAMURA T BOUTEMEUR M
Citation
Sv. Donskov et al., OBSERVATION OF THE A(4)(0) MESON IN THE ETA-PI(0) DECAY CHANNEL, Physics of atomic nuclei, 59(6), 1996, pp. 982-990
Citations number
19
Categorie Soggetti
Physics, Nuclear","Physics, Particles & Fields
Journal title
Physics of atomic nuclei → ACNP
ISSN journal
10637788
Volume
59
Issue
6
Year of publication
1996
Pages
982 - 990
Database
ISI
SICI code
1063-7788(1996)59:6<982:OOTAMI>2.0.ZU;2-8
Abstract
A mass-independent partial-wave analysis of the reaction pi(-)p -->eta pi(0)n is performed in the eta pi(0) mass range above 1.6 GeV. The an alysis employs the S, P, D, F, and G waves and is based on experimenta l data collected with the GAMS-2000 multiphoton spectrometer in a 38-G eV/c pion beam extracted from the 70-GeV accelerator of IHEP. A resona nce with quantum numbers J(PC)=4(++) and I-G=1(-) is observed in the G wave. Its mass and width are measured to be M=2010+/-20 MeV and Gamma =370+/-80 MeV. The mechanism of the observed a(4)(0)-meson production is dominated by natural-spin-parity exchange in the t channel. The mea sured unnatural-to-natural cross-section ratio is 0.60+/-0.16.