e+ e- ---> q qbar , with V0
q qbar event with two jets and a V0 in one of them.
The V0 originates in the middle of the TPC (up-left in x,y and z,y
projections, green tracks).
Both tracks have 3.7 GeV/c momentum.
If interpreted as pions, they lead to a mass of about 0.5 GeV, compatible with
a K0 decay.