# Questions tagged [normalization]

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### About constants in fermionic path integral in Peskin and Schroeder

I am confused by fermionic path integral used in Peskin and Schroeder. Equation (9.69) gives $$\Big(\prod_n\int d\bar{\theta}_nd\theta_n\Big)e^{-\bar{\theta}_iM_{ij}\theta_j}=\det M\tag{9.69}$$ But ...
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### How can I find the normaliztion constant of probabilty amplitude for small space-time path?

For free particle with $V=0$ case we get $$<x_n,t_n;x_{n-1},t_{n-1}>=\frac{1}{w(\Delta t)}\exp \left [\frac{im(x_n-x_{n-1})^2}{2\hbar\Delta t}\right ] \tag{6.42}$$ given in eqn. 6.42 of ...
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### How to normalize this wave function? [closed]

My wave function is $$\Psi = A e^\left({-\frac{\left|x\right|}{2a}- \frac{\left|y\right|}{2b} -\frac{\left|z\right|}{2c}}\right)dx$$ and I need to normalize it. I tried to take an integral of it and ...
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### Why isn't it a problem that the first term in the perturbative scattering series yields infinity (or one)?

In QFT we usually want to calculate objects of the form $\langle f|\hat S|i\rangle$ which yields the probability amplitude for the process $i \to f$. We can expand the scattering operator $\hat S$ in ...
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### Verification of the normalization of a wave function

A particle in an l-dimensional box is described by the wavefunction Probability density = 1 to be normalized but I can't proceed from the last step $$P= 1 - (1/L) (\sin 2n\pi\cos 2n\pi)$$ to equal to ...
### What happened to the factor of $\pi$ in this question?
$\\$ I was going through the answer to this problem, when I noticed that a factor of $\pi$ in the denominator disappeared and a factor of 4 appeared in the numerator when the author started ...