New measurements of the T20 component of tensor analyzing power in the reaction γd→ppπ− for photon energies 400−700 MeV are presented. The experiment was carried out on an internal tensor-polarized gas deuterium target of the VEPP-3 electron storage ring in 2023 with the use of tagged quasi-real photons and two-proton coincidence. For determination of T20, the asymmetry caused by a change of the sign of the tensor polarization of the deuteron target was measured. The new data are compared with the results of theoretical calculations based on the quasi-free approximation including πN and NN rescattering effects.

中文翻译：

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测量张量分析幂 T20 在第一谐振区上方的氘子上产生非相干 π− 光产生


提出了光子能量 400-700 MeV 的反应 γd→ppπ− 中张量分析功率的 T20 分量的新测量值。该实验于 2023 年在 VEPP-3 电子存储环的内部张量极化气体氘靶上进行，使用标记的准实光子和两个质子符合。为了测定 T20，测量了由氘靶张量极化符号变化引起的不对称性。将新数据与基于准自由近似的理论计算结果进行了比较，包括 πN 和 NN 再散射效应。