Measurement of the properties of theη’and search for other resonances in γγ→ηπ0π0

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1 November 1987

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

Vol. 36 (9) , 2633-2640
https://doi.org/10.1103/physrevd.36.2633

Abstract

The reaction

e^{+}

e^{-}

→

e^{+}

e^{-}

η

π^{0}

π^{0}

has been observed with the Crystal Ball detector at the DORIS II storage ring at DESY. The η

π^{0}

π^{0}

mass spectrum is dominated by the η’, and the two-photon width

Γ_{η ’ \to γ γ}

is determined to be 4.6±0.4±0.6 keV. Limits on

Γ_{X \to γ γ}

×

B_{X \to η π π}

are given for other possible states.

Keywords

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