HQET
• D* final state has larger BR and is easier to reconstruct than D. D*+ is cleaner than D*o.
• b_ u transitions are not so simple.
• b quark is nearly at rest
• b spin doesn’t affect energy
• At q2max, c is nearly at rest,
and light stuff isn’t affected.
l
n
b_c
Bigi, hep-ph/9907720 also: Ligeti, hep-ph/9904460
Expansion in powers
of as and 1/mb.
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