Theoretical analysis of the $\gamma\gamma \to \pi^0 \eta$ process
| Autor: | Danilkin, Igor, Deineka, Oleksandra, Vanderhaeghen, Marc |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 96, 114018 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.96.114018 |
| Popis: | We present a theoretical study of the $\gamma\gamma \to \pi\eta$ process from the threshold up to 1.4 GeV in the $\pi\eta$ 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 $\Gamma_{a_0\to\gamma\gamma}=0.27(4)$ keV. Comment: 10 pages, 7 figures |
| Databáze: | arXiv |
| Externí odkaz: |
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