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Question 34

Which Feynman diagram represents the process of beta-minus (β−\beta^-β−) decay at the quark level? Four Feynman diagrams labeled A, B, C, and D. Diagram A shows a down quark (d) entering from the bottom left, emitting a W-minus boson (W^-) that moves to the right, and changing into an up quark (u) moving to the top left. The W^- boson decays into an electron (e^-) and an electron antineutrino (\bar{\nu}_e) both moving towards the top right. Diagram B shows a d quark changing to a u quark emitting a W^-, which then decays into an e^- and an electron neutrino (\nu _e). Diagram C shows an u quark changing to a d quark emitting a W^-, which decays into an electron (e^-) and an electron antineutrino (\bar{\nu}_e). Diagram D shows an u quark changing to a d quark emitting a W^-, which decays into an e^- and an electron neutrino (\nu _e).

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