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Question 30

The diagram represents a quark change in which an electron neutrino is produced.

Feynman diagram representing a weak interaction. On the left, an incoming line labeled J goes up and right to a vertex. From this vertex, an outgoing line labeled K goes up and left. A horizontal wavy line connects this vertex to a right-hand vertex. From the right-hand vertex, two lines emerge: one going up and right labeled L, and one going down and right labeled with the symbol for an electron neutrino, \nu_e. Arrows on all lines point in the direction of propagation.

What are J, K, and L?

J: down quark; K: up quark; L: β−\beta^-β−

J: up quark; K: down quark; L: β−\beta^-β−

J: down quark; K: up quark; L: β+\beta^+β+

J: up quark; K: down quark; L: β+\beta^+β+

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