Draft: add D0->K3pi mode for DiCharm
main motivation is the Tcc->D0 D0 pi+
channel where adding D0->K3pi mode may increase statistic by x2.
Implemented by substituting D02Kpi
with D0
, which is a merge of D02Kpi
and D02K3pi
. Thus, all lines like of DiCharm, TriCharm, ... and so on will benefit.