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Theoretical analysis of the $\gamma\gamma \to \pi^0 \eta$ process

High Energy Physics - Phenomenology 2017-12-20 v2
Authors: Igor Danilkin , Oleksandra Deineka , Marc Vanderhaeghen
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Abstract

We present a theoretical study of the γγ→πη\gamma\gamma \to \pi\eta process from the threshold up to 1.4 GeV in the πη\pi\eta invariant mass. For the s-wave a0(980)a_0(980) resonance state we adopt a dispersive formalism using a coupled-channel Omn\`es representation, while the d-wave a2(1320)a_2(1320) state is described as a Breit-Wigner resonance. An analytic continuation to the a0(980)a_0(980) pole position allows us to extract its two-photon decay width as Γa0→γγ=0.27(4)\Gamma_{a_0\to\gamma\gamma}=0.27(4) keV.

Keywords

two-photon process pi eta production a0(980) resonance dispersive formalism Omnès representation decay width

Cite

@article{arxiv.1709.08595,
  title  = {Theoretical analysis of the $\gamma\gamma \to \pi^0 \eta$ process},
  author = {Igor Danilkin and Oleksandra Deineka and Marc Vanderhaeghen},
  journal= {arXiv preprint arXiv:1709.08595},
  year   = {2017}
}

Comments

10 pages, 7 figures

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