New results on D/f1 (1285) and ι/η(1440) from DM2
Abstract
Preliminary results from Partial Wave Analysis on the D/f1(1285) region in the J/ψ → γ4π± decay, and the ι/η(1440) seen in the J/ψ → γKK¯π decays are presented.
In the first channel the PWA excludes a η(1275) contribution, so supporting the f1 identification for the observed peak. A clear pseudoscalar signal is evidenced in the KK¯π mass spectrum decaying via δ/a0(980) as well as K*(892) dynamics. Its width is smaller than in the total spectrum, two other contributions, a narrow (less than 30 MeV/c2) 1++ peak at 1395 MeV/c2 which decays into δπ and a shoulder at 1515 MeV/c observed in the direct 3-body decay KK¯π, being present. The shoulder might have a spin-parity 1++ even if within strong statistical limitations.- Publication:
-
Glueballs, Hybrids, and Exotic Hadrons
- Pub Date:
- April 1989
- DOI:
- 10.1063/1.38151
- Bibcode:
- 1989AIPC..185..318S
- Keywords:
-
- 14.40.Cs;
- 13.40.Hq;
- 11.80.Et;
- Other mesons with S=C=0 mass<
- 2.5 GeV;
- Electromagnetic decays;
- Partial-wave analysis