Tuesday, January 29, 2019

homework and exercises - Guidance needed in finding scattering amplitude


If I have the Lagrangian L=ˉψ(iγμμm)ψgˉψiγ5ϕψ, where g is a coupling constant.



How to find the scattering amplitude for ϕψϕψ What I only learned in class was electron-electron scattering and electron-proton scattering and can't seem to relate this case above to any of them. I ask only for guidance. Please and thank you!




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...