|1,2||Beam particles (1:, 2:)|
|3,4|| Partons from the beam particles before ISR
|(3:from , 4:from )|
|5,6|| Partons from the beam particles after ISR;
the initial state in the matrix element calculation
|(5:from , 6:from )|
|7,8,9,10|| Final state particles before FSR;
the final state in the matrix element calculation
|(7:, 8:, 9:, 10:)|
|11||Final state particles after FSR, fragmentation and decay|
In case of the (quasi-)elastic process,
In case of the DIS process with both ISR and FSR, all of the lines have different contents in general.
As for di- events, there are 2 identical particles in the final state.
In GRAPE, those 2 particles are distinguished
in the following way;