a 2(1320) and π 2(1670) formation in the reaction γγ→ π + π - π 0
Abstract
The reaction e + e -→ e + e -π+π-π0 in the untagged mode has been measured with the CELLO detector at PETRA. The cross section is dominated by exclusive a 2(1320) production, whose radiative width is determined to be Γ γγ=1.00±0.07(stat.)±0.15(syst.)keV. An angular correlation analysis indicates pure helicity 2 with an upper limit on the helicity 0 contribution of 8.2% (at 95% c.l.). Excitation of the pseudotensor meson π{2/0}(1670) is observed for the first time in this reaction. The π2 radiative width and its dependence on interference effects are studied.
- Publication:
-
Zeitschrift fur Physik C Particles and Fields
- Pub Date:
- December 1990
- DOI:
- 10.1007/BF01560259
- Bibcode:
- 1990ZPhyC..46..583B