The ENFLW algorithm is described in the Section 10 of the paper:
`` Performances of the ALEPH detector at LEP ''
Nucl. Inst. and Meth. A 360 (1995), pp. 481-506 .
To use the ENFLW energy flow analysis, the EFLW card must be given in the ALPHA card file. If the EFLW card is present, the EFT section of ALPHA is filled with selected charged tracks and neutral ECAL and HCAL clusters. These objects can be accessed with DO loops (KFEFT, KLEFT, KNEFT - see 7.1.1) or with the particle name `EFLW' using the functions KPDIR and KFOLLO (described in 7.4).
The charged tracks that appear in the EFT section are copies of standard ALPHA charged tracks from the CHT section. Therefore, if a charged track in the CHT section is locked (using QLTRK or QLOCK), the corresponding track in the EFT section will be locked also (and vice versa).
All statement functions providing information about charged tracks can be used directly with charged tracks in the EFT section .