1000 Solved Problems in Modern Physics

10.3 Solutions 593

Diagram is the same as in Problem 10.2(iii)

(ii) τ−→μ−+l+l

Fig. 10.16(a)Decay ofτ−
τ−→ντ+μ−+νμ

(iii)l=νμ

Fig. 10.16(b)Decay ofB^0
meson

10.99 (a)Δ^0 →pπ−

The decayΔ^0 →p+π−proceeds via strong interaction in which a

gluon is involved.Δ^0 =udd;p=udu;π−=du

Fig. 10.17 (a)