Recent content by johnpatitucci

Thanks @marcusl. That is a pretty good idea and I going to try it now. Yesterday, I found a paper (you can see it here: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20010038494_2001057024.pdf" ) where the current loop expressions are written down in spherical as well as cartesian...

Hi there, a few days ago I derived the probably well-know expression for the magnetic field of a current loop including elliptic integrals of the first and second kind (it can be seen here http://plasmalab.pbworks.com/f/bfield.pdf" ). As I'd like to rotate and shift the position of the...

Thanks for your reply. I still don't get it. Cos(x) is not injective between -\pi /2 and \pi /2 as it is symmetric within this range (take e.g. \pm \frac{\pi}{4} and you obtain \cos(\pm\frac{\pi}{4}) = \frac{1}{\sqrt(2)} ). It would be true if 0 \leq x \leq \pi . But nevertheless, what...

Hey there, I got a problem with one recast of an expression which pops up by considering the completeness relation of common spherical harmonics: \sum_{l=0}^{\infty} \sum_{m=-l}^{+l} Y_{lm}(\theta,\phi)Y^{*}_{lm}(\theta^{\prime},\phi^{\prime}) = \frac{1}{sin(\theta)} \delta(\theta -...

Well, thanks for your replies. But just think of my expression with masses replaced according to m_1 -> m_i , m_2 -> m_j and sum over i,j = u,c,t. I've done that. The masses vanish by moving the helicity projectors to the right and therefore you can write the sum behind this expression, so...

Hi everybody,i'm worried about some calculation. I have to write down the amplitude for the neutral Kaon oscillation. There are two Box diagrams which are depicted here: http://upload.wikimedia.org/wikipedia/de/9/92/FeynmanKaon.png The two diagrams come along with a combinatorical factor of...