Show that it is possible to assign values of (B L) (B is the baryon number

Question:

Show that it is possible to assign values of (B − L) (B is the baryon number and L is the lepton number) to the X and Y bosons in such a way that B − L is conserved for all the fundamental vertices of Figures 12.2(c) and (d) and Figures 12.3. What are the values of B − L required?

Figure 12.2 (c) and (d)

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