PPT Slide

External Spectator

(Hadronic and semileptonic decays)

Internal Spectator

(suppressed by color - only hadronic decays)

Decay mechanisms of charmed mesons

Exchange

Annihilation

Spectator:

• G?M5c (Dominant!)

Exchange:

• G ?M2c

• ?|y(0)|2

• neutral hadronic

decay

• helicity suppression

Annihilation:

• G ? M2c

• ? |y(0)|2

• helicity suppression

• charge decays:

leptonic (observed)

hadronic (not observed)

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