ar X iv : h ep - p h / 99 04 30 7 v 1 1 2 A pr 1 99 9 Feynman versus Bakamjian - Thomas in Light Front Dynamics
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چکیده
We compare the Bakamjian-Thomas (BT) formulation of relativistic few-body systems with light front field theories that maintain closer contact with Feynman diagrams. We find that Feynman diagrams distinguish Melosh rotations and other kinematical quantities belonging to various composite subsystem frames that correspond to different loop integrals. The BT formalism knows only the rest frame of the whole composite system , where everything is evaluated. The goal of this article is to point out subtle, but important, differences between the Bakamjian-Thomas (BT) formulation of relativistic few-body systems [1] and light front field theories that maintain closer contact with Feynman diagrams (see, e.g., Ref. [2]). To be specific, we consider the triangle diagram that is a major ingredient of recent electromagnetic and weak baryon form factor evaluations in light front dynamics. We start with the effective Lagrangian for the N-q coupling
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تاریخ انتشار 1999