I am stuck with a simple-looking integral:
$\int_0^\infty dx \sqrt {x^2+M^2} \cdot e^{-x}$
where $M$ is just a real constant. I thought it could be expressed with the Modified Bessel Function, but it didn't work well.
I am stuck with a simple-looking integral:
$\int_0^\infty dx \sqrt {x^2+M^2} \cdot e^{-x}$
where $M$ is just a real constant. I thought it could be expressed with the Modified Bessel Function, but it didn't work well.
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