Measurement of resonance production in the reactionsγγ →π 0 π 0 andγγ →π 0 η

Oest, T. and Finch, Alexander (1990) Measurement of resonance production in the reactionsγγ →π 0 π 0 andγγ →π 0 η. Zeitschrift für Physik C Particles and Fields, 47 (3). pp. 343-352. ISSN 0170-9739

Full text not available from this repository.


Resonance production in the γγ reactionse + e −→e + e + e − π 0 π 0 ande + e − π 0 η has been studied with the JADE detector at PETRA. The decay widths into γγ of thef 2(1270),a 0(980) anda 2(1320) were measured to be Γγγ(f2(1270))=3.19±0.09+0.22−0.38 Kev,Γ λλ(a 0(980))=0.28±0.04±0.10 KeV/BR(a 0(980)→π 0 η) andΓ λλ (a 2(1320))=1.01±0.14±0.22KeV. For thef 0(975) andf 4(2050) upper limits of the widths were obtained,Γ λλ (f 0(975))<0.6 KeV, andΓ λλ(f 4(2050))<1.1 KeV, both at the 95% C.L. Assuming that the spin 0 background under thef 2(1270) is small, thef 2(1270) was found to be produced exclusively in a helicity 2 state. The helicity 0 contribution is <15% at the 95% C.L. The cross section forλλ→π 0 π 0 in the mass range 2.0–3.5 GeV/c2 was measured for the first time. Since the cross section forλλ→π + π − is a factor ∼2 larger, ππ production in this range can be interpreted as taking place via isospin 0 production.

Item Type: Journal Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3101
Departments: Faculty of Science and Technology > Physics
ID Code: 63812
Deposited By: ep_importer_pure
Deposited On: 02 May 2013 14:43
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 08:25

Actions (login required)

View Item View Item