For a gluon, JMOHEP(2,I) and JDAHEP(2,I)
point to the partons to which its colour and anti-colour are
connected, respectively [2]. For this purpose the primary
partons
from a hard subprocess are all regarded as outgoing.
Since quarks have no anti-colour, JDAHEP(2,I)
is used to point to its flavour partner. Similarly for
JMOHEP(2,I) in the case of an anti-quark.
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