B Does the Feynman diagram process actually exist, or is it just for computation?

[ronnie snooker]

i want to known whether virtual particle exist or not , and does exchange of particle really happen in interaction.

 

[mfb]

You can't point to an interaction and say "it was this Feynman diagram". They are tools for calculations in perturbation theory, just like the virtual particles in the diagrams.
I fear everything beyond that is philosophy.

 

[Orodruin]

Just to hammer the point: Feynman diagrams are graphical representations of mathematical expressions for different terms in a perturbative expansion. There is nothing more to them than that.

 

[weirdoguy]

Also this might help:
https://www.physicsforums.com/insights/physics-virtual-particles/
https://www.physicsforums.com/insights/misconceptions-virtual-particles/

 

[ronnie snooker]

thanks for all of you!