Notes

(1) We use the symbol e, but all our results apply equally well to muons. The two-body decays , are negligible if we assume D is pseudoscalar, since the matrix element is then proportional to , .

(2) Note that is supposed to include the effects of the production of heavier charmed particles which decay to D.

(3) We consider only the products of the charmed quark which is struck by the virtual photon in the electromagnetic case. We are not aware of any serious attempt to treat the spectator (anti) charmed quark's products, which presumably give rise to soft leptons in the hole fragmentation region.

(4) Derman [20] applied his model at finite energies in such a way that becomes less than one, violating the normalization condition, but it seems likely that this was not important numerically since is small for near one.

previous