The Programs
            In High Energy Physics, experimentation to test new theories is done using a particle accelerator. In such a device, 2 particles are collided, and an explosion takes place inside the part of the accelerator that is the 'detector'. In this region, the reaction that physicists want to learn about takes place. However, the reaction of interest is on such a short time span that there is no way of observing it. Luckily for us, this unobservable reaction cascades into a complex chain of reactions, which ultimately end up in a detectable spread of particles. It is a very large spread, but it is detectable none the less. Since it is such a large spread of particles, physicists use computer programs to run a model of the experiment, and theorize on the spread of particles you would get, given that the first reaction you wanted to know about (but couldnt see) actually happened. This is why we use these programs.
           On this website, you will find a number of different programs that you can run (at the computing expense of the University of Florida) to do your own high energy experiment computer model. The ISAJET link allows the user to calculate the mass spectrum and decay modes along with branching fractions of the supersymmetric model chosen. The PYTHIA link allows the user to run events for a supersymmetric model described by their input parameters and to view a table of cross-sections as well as physical masses and branching fractions. Simply pick one of the programs listed below, and follow the steps to input all the relevent data correctly. At the end you will be presented with the output from the program you ran. Enjoy!
        Note: on this site, holding your mouse over a field will often bring up a small clue about that parameter.


---This page created and maintained by Jonathan Blender of REU 2003. Questions or comments directed to

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