Eta puzzle: the decay eta. --> pi. /sup 0/. gamma gamma

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:5565502

Binon, F; Bricman, C B; Gouanere, M; Davydov, V A; Donskov, S V; Duteil, P; Dufournaud, J; Inyakin, A V; Kakauridze, D B; Kachanov, V A; Kulik, A V; Lagnaux, J P; Lednev, A A; Mikhailov, Y V; Peneux, J P; Prokoshkin, Y D; Rodnov, Y V; Sadovskii, S A; Sin'govskii, A V; Startsev, A V ; Stroot, J P; Sugonyaev, V P; Khaustov, G V

Experiments have been carried out to search for the decay eta..--> pi../sup 0/..gamma gamma.. at a level of accuracy ten times better than that in earlier studies in which this decay was observed. The measurements were carried out at the 70 GeV IHEP accelerator using the hodoscopic ..gamma.. spectrometer GAMS-2000. It is shown that the decay eta..--> pi../sup 0/..gamma gamma.. was not observed in the earlier studies. An upper limit is obtained for the partial width of this decay at the 90% confidence level: BR (eta..--> pi../sup 0/..gamma gamma..)<3 x 10/sup -3/.

• Research Organization: Collaboration of Institute of High Energy Physics, Serpukhov
• OSTI ID: 5565502
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 33:6; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DECAY
ELECTROMAGNETIC PARTICLE DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
ETA MESONS
GEV RANGE
GEV RANGE 10-100
HADRONS
MESONS
PARTICLE DECAY
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIATIVE DECAY
WEAK PARTICLE DECAY