非弹性门限上Luscher有限体积法的推广(形式主义)
An extension to the Luscher's finite volume method above inelastic threashold (formalism)
摘要:
本文提出了一种在非弹性阈值以上的Luscher有限体积法的推广。本文将HAL-QCD协作组最近提出的方法推广到单通道系统。针对Nambu-Bethe-Salpeter(NBS)波函数(等时)在空间无穷远处的渐近行为,通过引入能量无关的相互作用核,构造了有效Schrodinger方程的耦合通道扩展.由于NBS波函数包含了远距离T矩阵的信息,因此可以通过求解无限体积中的耦合通道有效薛定谔方程得到S矩阵。
英文摘要:
An extension of the Luscher's finite volume method above inelastic thresholds is proposed. It is fulfilled by extendind the procedure recently proposed by HAL-QCD Collaboration for a single channel system. Focusing on the asymptotic behaviors of the Nambu-Bethe-Salpeter (NBS) wave functions (equal-time) near spatial infinity, a coupled channel extension of effective Schrodinger equation is constructed by introducing an energy-independent interaction kernel. Because the NBS wave functions contain the information of T-matrix at long distance, S-matrix can be obtained by solving the coupled channel effective Schrodinger equation in the infinite volume.
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