I'm reading through Peskin&Schroeder, and they mention that the probability of transition from a state [itex]|\psi_0\rangle[/itex] to a state [itex]|\psi_1\rangle[/itex] is given by:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\langle \psi_1|H|\psi_0\rangle[/tex]

where [itex]H[/itex] is the Hamiltonian. Can someone please explain how this formula is derived? Thx

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# Transition amplitude

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