Structure of the program

The program is written in the context of GEANT3. The routines specific to the Linear Collider Detector are implemented via the GEANT user routines GUxxxx. They are explained in more detail in the following sections.

The code is split into two main parts: the simulation and the reconstruction part. If you want to can build programs for only the reconstruction or only the simulation.

To ease the interface of user analysis code with Brahms a structure of user routines is provided, which closely models the GEANT routines, and which are called at the end of the relevant GEANT routines. These routines are

UBINIT	initialisation, before FFREAD
UBSETR	initialisation, after FFREAD
UBKINE	after generator input
UBTRAK	called after GUTRAK for each GEANT track individually
UBTREV	called after GUTREV, once per event
UBSTEP	called after GUSTEP
UBOUT(i)	called at the end of each event
	i=1 after the end of the simulation
	i=2 after the end of the reconstruction