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    In quantum physics, how do you know whether, in an interaction such as beta- decay where n ----> p + e- + (anti)Ve how would i know, when drawing a feynman diagram what the charge of the W boson is, how do i know if its negative or positive?
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    Just keep in mind that charge has to be conserved. So in B minus decay, at the start we have no overall charge. When the down quark (-1/3) decays into an up quark (+2/3) giving off a W-boson, that boson must be negative so that the overall charge is still zero. This then decays into an electron and an anti-electron neutrino. I found this blog very helpful: http://www.quantumdiaries.org/2010/0...ynman-diagams/
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    It also depends in which direction the W boson is exchanged. For example a +ve W boson exchanged left -> right is the same as a -ve W boson being exchange right -> left.
 
 
 
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