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Hello, I'm looking at the following computation from the Peskin and Schroeder's book:
See file attached
In the second page, the second term that's being integrated, I don't understand why it has a negative i in the exponential, that'll keep the energy term the same, but will swap the sign of the spatial terms, wouldn't it?
Thank you beforehand
See file attached
In the second page, the second term that's being integrated, I don't understand why it has a negative i in the exponential, that'll keep the energy term the same, but will swap the sign of the spatial terms, wouldn't it?
Thank you beforehand
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