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arXiv 1604.01951hep-phnucl-th
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$J/ψ\to p\bar{p}π^{0}(η)$衰变的角分布

Angular distributions in $J/ψ\to p\bar{p}π^{0}(η)$ decays

V. F. Dmitriev, A. I. Milstein, S. G. Salnikov

备注：
10 pages, 8 figures
发表信息：
Phys. Lett. B 760 (2016) 139-142
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摘要：

利用$N\bar{N}$光学势计算了过程$J/ψ\to p\bar{p}π^{0}$和$J/ψ\to p\bar{p}η$在接近$p\bar{p}$阈值处的微分衰变率.对$ψ(2S)$的衰变进行了相同的计算。我们使用的潜力，已建议拟合截面的$N\bar{N}$散射连同$N\bar{N}$和6 π生产在$e^{+}e^{-}$湮灭接近$p\bar{p}$阈值。计算得到的$p\bar{p}$不变质谱与已有的实验数据一致。角分布的各向异性，这似乎是由于在$N\bar{N}$相互作用的张量力，预测接近的$p\bar{p}$阈值。这种各向异性足够大，可以通过实验进行研究。这样的测量将允许人们检查$N\bar{N}$相互作用模型的准确性。

英文摘要：

The differential decay rates of the processes $J/ψ\to p\bar{p}π^{0}$ and $J/ψ\to p\bar{p}η$ close to the $p\bar{p}$ threshold are calculated with the help of the $N\bar{N}$ optical potential. The same calculations are made for the decays of $ψ(2S)$. We use the potential which has been suggested to fit the cross sections of $N\bar{N}$ scattering together with $N\bar{N}$ and six pion production in $e^{+}e^{-}$ annihilation close to the $p\bar{p}$ threshold. The $p\bar{p}$ invariant mass spectra is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the $N\bar{N}$ interaction, is predicted close to the $p\bar{p}$ threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of $N\bar{N}$ interaction.

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