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## Main Question or Discussion Point

Please teach me about this question:

In a process of scattering of closed system of particles(in point of view of quantum field theory),the Lagrangian of the system is not invarian(up to 4-divergence) under time translation.So that following the Noether theorem,the energy of the system is not conservation.I think this is a paradox.

Thank you very much for advanced.

In a process of scattering of closed system of particles(in point of view of quantum field theory),the Lagrangian of the system is not invarian(up to 4-divergence) under time translation.So that following the Noether theorem,the energy of the system is not conservation.I think this is a paradox.

Thank you very much for advanced.