LUND_Frag.

The DESCRIBE LUND_Frag. is prepared for hadronize partons stored in the bank ``Spring:Parton_List''. The obtained stable and unstable particles are written in the bank ``Generator:Particle_List''. It uses LUND6.3 JETSET program for hadronization[#!LUND63!#]. The default parameter of JETSET program can be modified as follows. The command syntax is,
2cm
where

• [array_name:] The name of array where JETSET parameters are stored. As the array name MST, PAR, MSTE, PARE, MASS, BRF, and IDB is recognized (see. pp.375-382 or pp.395-399 of Ref.[#!LUND62!#]).
• [address:] The element address of the array of which parameter is overwrite.
• [value:] New value for the parameter, namely value is stored in array_name(address).

Input data should be terminated by EXIT to return to the FULL steering. The example to overwrite default JETSET6.3 parameters is shown in the Fig. 2, where we suppress $\pi^0$ and K_s decay and change the fragmentation parameters, $\sigma_q=0.40$ and a=0.45. Note that the all long lived unstable particles must be decayed properly prior to give the result to the detector simulator described in the following two subsections.

 

Figure 2:  Example of input data for LUND_Frag module.