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Evidence for a πη-P-wave in -annihilations at rest into π0π0η
- Source :
- Physics Letters B. 446:349-355
- Publication Year :
- 1999
- Publisher :
- Elsevier BV, 1999.
-
Abstract
- A partial wave analysis is presented of two high-statistics data samples of protonium annihilation into π 0 π 0 η in liquid and 12 atm gaseous hydrogen. The contributions from the 1 S 0 , 3 P 1 and 3 P 2 initial atomic fine structure states to the two data sets are different. The change of their fractional contributions when going from liquid to gaseous H 2 as calculated in a cascade model is imposed in fitting the data. Thus the uncertainty in the fraction of S-state and P-state capture is minimized. Both data sets allow a description with a common set of resonances and resonance parameters. The inclusion of a π η P-wave in the fit gives supportive evidence for the ρ (1405) , with parameters compatible with previous findings.
Details
- ISSN :
- 03702693
- Volume :
- 446
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi...........533f39692fd3b09f3d7f0f9bb2afbf85