一般动标架晶格上介子和重子共振态的散射相
Scattering phases for meson and baryon resonances on general moving-frame lattices
摘要:
Lüscher的一个建议使人们能够从有限体积中晶格哈密顿量的能级计算弹性两体系统的散射相。在本文中,我们将该形式推广到S-,P-和D-波介子和重子共振,以及一般的总动量。使用非零动量有几个优点,其中之一是在单个晶格体积上可以获得更宽范围的能级,并将能级交叉移动到更小的$m_πL$值。
英文摘要:
A proposal by Lüscher enables one to compute the scattering phases of elastic two-body systems from the energy levels of the lattice Hamiltonian in a finite volume. In this work we generalize the formalism to S--, P-- and D--wave meson and baryon resonances, and general total momenta. Employing nonvanishing momenta has several advantages, among them making a wider range of energy levels accessible on a single lattice volume and shifting the level crossing to smaller values of $m_πL$.
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