As i studied Fermi golden rule. It involves transition probability of an initial state transiting to a final state in case of constant potential. As i understand the product of time of transition and the frequency of transition should be very much larger than one in order that the dirac delta function appears.(adsbygoogle = window.adsbygoogle || []).push({});

Does this mean that the time of particle collision(for e.g two particles come from past and collide with each other) should be infinite in order that the energy of final and initial states are same.

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# Transition probability

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