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• W3034850121 abstract "Abstract The process $$e^+e^-rightarrow eta pi ^0gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>η</mml:mi> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$hbox {pb}^{-1}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mtext>pb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> collider. The $$e^+e^-rightarrow eta pi ^0gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>η</mml:mi> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$omega eta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>ω</mml:mi> <mml:mi>η</mml:mi> </mml:mrow> </mml:math> intermediate state. The measured cross section of the subprocess $$e^+e^-rightarrow omega eta rightarrow eta pi ^0gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>ω</mml:mi> <mml:mi>η</mml:mi> <mml:mo>→</mml:mo> <mml:mi>η</mml:mi> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> is consistent with previous measurements in the $$e^+e^-rightarrow pi ^+pi ^-pi ^0eta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>η</mml:mi> </mml:mrow> </mml:math> mode. It is found, with a significance of $$5.6sigma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>5.6</mml:mn> <mml:mi>σ</mml:mi> </mml:mrow> </mml:math> , that the process $$e^+e^-rightarrow eta pi ^0gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>η</mml:mi> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-rightarrow a_{0}(1450)gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msub> <mml:mi>a</mml:mi> <mml:mn>0</mml:mn> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>1450</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV." @default.
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• W3034850121 date "2020-11-01" @default.
• W3034850121 modified "2023-09-28" @default.
• W3034850121 title "Study of the process $$e^+e^- rightarrow eta pi ^0gamma $$ in the energy range $$sqrt{s} = {1.05-2.00}$$ GeV with the SND detector" @default.
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• W3034850121 doi "https://doi.org/10.1140/epjc/s10052-020-08556-w" @default.
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