粗动量网格上的重整化群和散射等效哈密顿量
Renormalization group and scattering-equivalent Hamiltonians on a coarse momentum grid
摘要:
我们认为$ππ$散射问题的上下文中的Kadyshevsky方程。在这个方案中,我们引入了一个动量网格,并提供了一个基于切比雪夫角的谱移的相移的等谱定义。我们解决的问题,不自然的高动量尾巴中存在的拟合的相互作用,达到远远超过最大的质量中心能量的$\sqrt{s}=1.4$ GeV的能量。事实证明,这些尾巴可以通过使用SRG的块对角生成器来积分。
英文摘要:
We consider the $ππ$-scattering problem in the context of the Kadyshevsky equation. In this scheme, we introduce a momentum grid and provide an isospectral definition of the phase-shift based on the spectral shift of a Chebyshev angle. We address the problem of the unnatural high momentum tails present in the fitted interactions which reaches energies far beyond the maximal center-of-mass energy of $\sqrt{s}=1.4$ GeV. It turns out that these tails can be integrated out by using a block-diagonal generator of the SRG.
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