Systematic gauge-invariant approach to heavy quarkonium decays.

  • E Khan, Hoodbhoy
  • Published 1996 in Physical review. D, Particles and fields


We present a method which, starting directly from QCD, permits a systematic gauge-invariant expansion to be made for all hard processes involving quarkonia in powers of the quark relative velocity, a small natural parameter for heavy quark systems. Our treatment automatically introduces soft gluons in the expansion. Corrections arising from the… (More)

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