10.3 Solutions
601
where the combinations (1,2) are (e
+
, ν e ) or (μ
+
, ν μ ) or ( ¯
d, u), the last
one three times for three colors. The combinations (τ
+
, ν τ ) and (¯ s, c) are
ruled out as energy is violated.
(b) Hadronic decay of τ
−
τ
−
→ π
−
ν τ
Fig. 10.29(b)
10.112 (a)
Fig. 10.30(a)
Two-photon annihilation; two ordered diagrams
(b)
Fig. 10.30(b)
601
where the combinations (1,2) are (e
+
, ν e ) or (μ
+
, ν μ ) or ( ¯
d, u), the last
one three times for three colors. The combinations (τ
+
, ν τ ) and (¯ s, c) are
ruled out as energy is violated.
(b) Hadronic decay of τ
−
τ
−
→ π
−
ν τ
Fig. 10.29(b)
10.112 (a)
Fig. 10.30(a)
Two-photon annihilation; two ordered diagrams
(b)
Fig. 10.30(b)