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- W3186495117 abstract "We present a theoretical study of the $gammagamma to pieta$ process from the threshold up to 1.4 GeV in the $pieta$ invariant mass. For the s-wave $a_0(980)$ resonance state we adopt a dispersive formalism using a coupled-channel Omn`es representation, while the d-wave $a_2(1320)$ state is described as a Breit-Wigner resonance. An analytic continuation to the $a_0(980)$ pole position allows us to extract its two-photon decay width as $Gamma_{a_0togammagamma}=0.27(4)$ keV." @default.
- W3186495117 created "2021-08-02" @default.
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- W3186495117 date "2017-12-15" @default.
- W3186495117 modified "2023-09-25" @default.
- W3186495117 title "Theoretical analysis of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mo stretchy=false>→</mml:mo><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mi>η</mml:mi></mml:mrow></mml:math> process" @default.
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- W3186495117 doi "https://doi.org/10.1103/physrevd.96.114018" @default.
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