Triangle diagram in heavy-baryon chiral perturbation theory

Triangle diagram in heavy-baryon chiral perturbation theory
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重重子手征微扰理论中的三角图

DOI:
10.1088/1361-6471/ab4ed3
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发表时间:
2016-05
期刊:
Journal of Physics G: Nuclear and Particle Physics
影响因子:
--
通讯作者:
Bingwei Long
Bingwei Long
中科院分区:
其他
文献类型:
--
作者:
Songlin Lyu;Bingwei Long

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在π-重子三角图中,我们发现了一个特殊的运动学区域,在这个区域中,动量转移的平方t接近于4m_2:|t - 4m_\pi^2|\lesssim m_\pi^4/m_N^2$。而不是争论的异常阈值的地面上,我们调查可能的影响功率计数。与物理区域中的$\sim m_\pi$相反,π介子可以具有非常小的能量,这使得所有三个传播子都非常接近它们的质量壳层,并对回路积分有显著的贡献。我们发现,在这个狭窄的运动学窗口中,重子传播子的静态极限近似是无效的,动能的重新计算是必要的。有趣的是,与低能重子过程相反,重子反冲的这种恢复并不会导致图中功率计数的总体增强。
The pion-baryon triangle diagram is inspected for a special kinematic region where the squared momentum transfer $t$ is close to $4m_\pi^2$: $|t - 4m_\pi^2| \lesssim m_\pi^4/m_N^2$. Instead of arguing on the ground of anomalous threshold, we investigate possible impacts on power counting. The pion can have very small energies, as opposed to $\sim m_\pi$ in the physical region, which allows all three propagators to be extremely near their mass shell and contributes significantly to the loop integral. We find that in this narrow kinematic window the static-limit approximation for the baryon propagator is invalid and the resummation of the kinetic energy is necessary. Interestingly, in contrast to low-energy two-baryon processes, this resummation of baryon recoils does not lead to overall enhancement of power counting of the diagram.
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