标题： 有效的增强和“点形式”方法 显示英文标题

标题： Effective boost and "point-form" approach

摘要： 三角形费曼图可以视为描述由零范围相互作用束缚态的形状因子。 这些形状因子针对标量粒子进行计算，并与点形式和非相对论结果进行比较。 通过检查不同参考系中完整计算的表达式，我们得到一个有效的洛伦兹变换，该变换可以与当前点形式计算所依据的相对论运动学以及伽利略变换进行比较。 在此简单模型中获得的解析表达式允许对类似研究中获得的某些结果进行定性检验。 特别是，指出了最近点形式方法的实际应用与狄拉克最初提出的点形式之间存在不一致之处。 显示英文摘要

摘要： Triangle Feynman diagrams can be considered as describing form factors of states bound by a zero-range interaction. These form factors are calculated for scalar particles and compared to point-form and non-relativistic results. By examining the expressions of the complete calculation in different frames, we obtain an effective boost transformation which can be compared to the relativistic kinematical one underlying the present point-form calculations, as well as to the Galilean boost. The analytic expressions obtained in this simple model allow a qualitative check of certain results obtained in similar studies. In particular, a mismatch is pointed out between recent practical applications of the point-form approach and the one originally proposed by Dirac.