Offline Software

All software except for a few HEP specific and non HEP specific free software packages has been developed by the members of the Belle collaboration. In particular, the mechanisms to handle event structure and input and output formatting and to process events in parallel on a large SMP (Symmetric Multiple Processor) compute server have been developed locally using C and C++ programming languages. GEANT3 has been used in simulations [91]. The event processing framework, called BASF (Belle AnalysiS Framwork) [90], takes users' reconstruction and analysis codes as modules which are linked dynamically at the run time. A module is written as an object of a class of C++. The class, inherited from the module class of BASF which has virtual functions for events, begins and ends run processing and other utility functions such as initialization, termination and histogram definitions. Modules written in Fortran and C can also be linked using wrapper functions. The data transfer between modules is managed by PANTHER, an event and I/O management package developed by the Belle collaboration. PANTHER describes the logical structure and inter-relationships of the data using an entity relationship model. In order to store data (structure) in the event structure one writes a description file as an ASCII text file. A PANTHER utility converts the description file into C and C++ header files and source code. The user will include the header files in his/her code and the source code is compiled and linked into the user module to have access to the data structure in the module. The standard reconstruction modules for sub-detectors and global reconstruction of four momenta, production vertices and likelihoods for being specific species such as electrons, muons, pions, kaons, protons and gammas of charged and neutral particles have been prepared and used to produce physics results as well as detector performance results described in this paper.