Examine pion wavfunctions.
Spin parallel/antiparallel case
We define qpara(x)
to be the probability of
finding a quark with momentum
fraction x and the same spin as the antiquark.
We define qanti(x)
to be the probability of
finding a quark with momentum
fraction x and the opposite spin as the antiquark.
We define q(x,y)
to be the probability of finding a quark with momentum fraction
x and an antiquark with momentum fraction y.
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