A question about a Feynman Diagram

[heavybuilder]

Could somebody explain me this?: Why is the arrow of the electron-antineutrino pointed towards the W-boson and not as in the second picture upwards?

This is my first post and also haven't learned too much about physics yet so please if anything is unclear hit me up.

 

[Vanadium 50]

Because somebody drew it backwards.

 

[heavybuilder]

Because somebody drew it backwards.

The one that is drawn on is mine. The correct one should be the other one

 

[Vanadium 50]

Then you drew it backwards.

The arrows indicate particle/antiparticle, not direction of motion.

 

[heavybuilder]

So if i get it right: If a W- boson decays like here the output will be an electron-antineutrino and an electron?

 

[heavybuilder]

Oh and another question, this picture is about muon capture but it isn't right is it? First of all there are no anti-leptons so it can't be right: L=1+1=2 second of all the muon isn't an antimuon so the arrow should be the other way around, shouldn't it?