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A Heavy Quark-Antiquark Annihilations

  1. Apr 10, 2017 #1
    Does Charm-Anticharm (in relative S-wave with spin-1) annihilates to a single photon? How does this vertex look like in QCD?
  2. jcsd
  3. Apr 10, 2017 #2


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    That would violate total 4-momentum conservation.
  4. Apr 10, 2017 #3


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    It can, however, got to a "virtual photon", i.e., a "dilepton" which is an ##e^+ e^-## or ##\mu^+ \mu^-## pair. This lead to the discovery of the ##J/\psi## ("The November Revolution") and thus the discovery of charm (expected from the GIM mechanism in electroweak theory):

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