Search for the radiative decay η→π0γγ in the SND experiment at VEPP-2M

2001/01/25 by M. N. Achasov, М. Н. Ачасов, K. I. Beloborodov +41 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1016/s0550-3213(01)00040-2

published as Nucl.Phys.B600:3-20,2001 · 24 pages, 6 figures, LaTex. To be published in Nucl. Phys. B

arxiv created 2001/01/25 · openalex publication_date 2001/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The η→ π⁰ γγ decay was investigated by the SND detector at VEPP-2M e⁺e^- collider in the reaction e⁺e^-→ϕ→ ηγ. Here we present the results and some details of this study. We report an upper limit (90% c.l.) Br(η→ π⁰ γγ)<8.4× 10^-4 as our final result. Our upper limit does not contradict the earlier measurement by GAMS spectrometer. To facilitate future studies a rather detailed review of the problem is also given.

Cited by

• \η \→ \π⁰ \γ \γ decay within unitarized chiral perturbation theory
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