Study of the process e⁺e^- → ηηγ in the energy range √(s) = 1.17--2.00 GeV with the SND detector

2021/10/12 by М. Н. Ачасов, SND Collaboration, Achasov, M. N. +71
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2110.05845

openalex publication_date 2021/10/12 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

The process e⁺e^-→ηηγ is studied in the center-of-mass energy range 1.17-2.00 GeV using data with an integrated luminosity of 201 pb^-1collected by the SND detector at the VEPP-2000 e⁺e^- collider. The e⁺e^-→ηηγ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the ϕη intermediate state. Our result on the e⁺e^-→ηηγ cross section is consistent with the e⁺e^-→ϕη measurement in the ϕ→ K⁺ K^- mode. The search for radiative processes contributing to the e⁺e^-→ηηγ cross section is performed, and no significant signal is observed.

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