20,345
edits
Changes
→Constructing a Feynman Diagram
: '''Feynman Diagrams''' can be constructed from the equations representing a [[Subatomic Particle|particle]] [[Fundamental Interaction|interaction]].
: The [[Subatomic Particle|particles]] at the start of the [[Nuclear Equation|equation]] are written at the bottom of the '''Feynman diagram''' while the [[product]]s are written at the top.
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |
<math>p + e^-</math>
| style="height:20px; width:200px; text-align:center;" |
<math>p + e^- \rightarrow n + \beta^- + \bar\nu_e</math>
| style="height:20px; width:200px; text-align:center;" |
<math>p + e^- \rightarrow n + \beta^- + \bar\nu_e</math>
|-
|[[File:FeynmanDiagramElectronCapturePt1.png|center|200px]]
|[[File:FeynmanDiagramElectronCapturePt2.png|center|200px]]
|[[File:FeynmanDiagramElectronCapture.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |The [[Subatomic Particle|particles]] prior to the [[Fundamental Interaction|interaction]] are drawn first at the bottom of the '''Feynman diagram'''.
| style="height:20px; width:200px; text-align:center;" |The [[Subatomic Particle|particles]] after the [[Fundamental Interaction|interaction]] are drawn at the top of the '''Feynman diagram'''. It should be recognised that [[Conservation of Baryon Number|baryon conservation]] means a [[baryon]] becomes another [[baryon]] and [[Conservation of Lepton Number|lepton conservation]] means that a [[lepton]] is transformed from one type of [[lepton]] into another.
| style="height:20px; width:200px; text-align:center;" |Finally the [[boson]] mediating the [[Fundamental Interaction|interaction]] is added as a [[wave]] between the two points of [[Fundamental Interaction|interaction]]. In this case a [[proton]] loses its [[Positive Charge|positive charge]] therefore it is carried away to the [[electron]] via the [[W-boson|W<sup>+</sup> boson]] transforming the [[electron]] into an [[Electron Neutrino|electron neutrino]].
|}
===Examples===