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arXiv 1004.0140nucl-th
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2.2 GeV的核子-核子碰撞中双π介子产生的唯象分析

Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV

Xu Cao, Bing-Song Zou, Hu-Shan Xu

摘要:

利用一种有效的拉格朗日方法,我们分析了几个NN \to NNππ通道,包括各种共振质量高达1.72 GeV。对于π介子对为零的通道,我们证实了N*(1440)\to Nσ在近阈值区占优势.在更高的能量和最后一个π介子对为同位旋1的通道中,我们发现N*(1440)\to Δπ、双Δ、Δ(1600)\to N*(1440)π、Δ(1600)\to Δπ和Δ(1620)\to Δπ的贡献很大。在接近阈值的能量处,Δ \to Δπ、Δ \to Nπ、N \to Δπ和核子极点也有相当大的贡献。除了pp \to ppπ^0π^0通道在能量为1.1 GeV附近外,我们很好地再现了束流能量为2.2 GeV时的总截面,并且我们的结果与在CELSIUS和COSY上测量的pp \to ppπ^+π^-,pp \to nnπ^+π^+和pp \to ppπ^0π^0的微分截面的现有数据一致.

英文摘要:

With an effective Lagrangian approach, we analyze several NN \to NNππchannels by including various resonances with mass up to 1.72 GeV. For the channels with the pion pair of isospin zero, we confirm the dominance of N*(1440)\to Nσin the near threshold region. At higher energies and for channels with the final pion pair of isospin one, we find large contributions from N*(1440)\to Δπ, double-Delta, Δ(1600) \to N*(1440)π, Δ(1600) \to Δπand Δ(1620) \to Δπ. There are also sizeable contributions from Δ\to Δπ, Δ\to Nπ, N \to Δπand nucleon pole at energies close to the threshold. We well reproduce the total cross sections up to beam energies of 2.2 GeV except for the pp\to ppπ^0π^0 channel at energies around 1.1 GeV and our results agree with the existing data of differential cross sections of pp \to ppπ^+π^-, pp \to nnπ^+π^+ and pp \to ppπ^0π^0 which are measured at CELSIUS and COSY.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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