Observation of the production ofηmesons in two-photon collisions

1 December 1983

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 28 (11) , 2896-2899
https://doi.org/10.1103/physrevd.28.2896

Abstract

Using 2674

{nb}^{- 1}

of data taken at

\sqrt{s}

from 5.00 to 7.25 GeV with a trigger sensitive to decays of lower-mass particles produced in two-photon collisions, we have observed 56±12 events consistent with the reaction

e^{+} e^{-} \to e^{+} e^{-} η

η \to γ γ

. Background has been subtracted using separated-beam data. We obtain

Γ_{γ γ} (η) = 0.56 \pm 0.16

keV and the pseudoscalar-nonet mixing angle

θ_{P} = - 17.6 ° \pm 3.6 °

Keywords

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