HSRWGT

A program to reweight DJANGOH events for modified input parameters.
Since a full event simulation including detector performance is very time consuming, it is often desirable to describe the effect of modified physics input to a Monte Carlo by assigning weights to the events of an already existing event sample. The program HSRWGT is a tool to calculate these weights for event samples obtained from DJANGOH (HERACLES and DJANGO6). It allows to simplify data analyses for cases where a limited list of input options relevant for the overall description of the cross section has to be changed.

Author: H. Spiesberger, February 1998.

The manual of HSRWGT describes how to use the program and what kind of input modifications can be treated with it
The source code is split into two parts:
- hsrwgt_m.f.gz, which contains the main program and most of the routines, and
- hsrwgt_u.f.gz containing routines which might be changed by the user as described in the manual
Three examples show how the program may be used:
- The first example shows that the effect of higher-order weak loop corrections (as described by the input flags LPARIN(7...11)) can be obtained by reweighting. You can look up the output file from DJANGOH, the input given to HSRWGT and the output obtained from HSRWGT. The distribution of weights can also be looked up.
- In the second example the effect of a modification of the W boson mass on the charged current cross section is investigated: Again, you can find the output file from DJANGOH, the input for HSRWGT, the output from HSRWGT and the distribution of weights.
- The third example shows the effect of including the longitudinal structure function in the neutral current cross section: Here you find the output file from DJANGOH, the input for HSRWGT, the output from HSRWGT and the distribution of weights.
All files are gzipped.
Please report experience, problems, suggestions, bugs to Hubert Spiesberger (hspiesb@mail.desy.de)

Constructed by HS