Measurement of the Tensor Analyzing Power $$\boldsymbol{T}_{\mathbf{20}}$$ for the Reaction $${\gamma}\boldsymbol{d\to pn}{\pi}^{\mathbf{0}}$$ in the Region of Low Proton Energies

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In this paper, we present new experimental results for the tensor analyzing power $$T_{20}$$ of the reaction $$\gamma d\to pn\pi^{0}$$ in the region of low proton energies. The results are presented in the photon energy range of $$300\text{ MeV}<E_{\gamma}<600\text{ MeV}$$ and the proton energy range of $$10\text{ MeV}<E_{p}<40\text{ MeV}$$ . The paper uses the experimental statistics accumulated at the VEPP-3 accelerator complex in 2013. To identify the events of the reaction $$\gamma d\to pn\pi^{0}$$ , we used the registration of the proton and two $$\gamma$$ -quanta from the decay $$\pi^{0}\to 2\gamma$$ in coincidence. The experimental results were compared with the results of statistical simulation. To perform the statistical simulation, we used the unitary isobar model MAID 2007 for the elementary pion-nucleon photoproduction amplitude and took into account $$\pi N$$ and $$NN$$ rescattering in the final state of the reaction $$\gamma d\to pn\pi^{0}$$ .

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