ISAJET 7.91

A Monte Carlo Event Generator for p p, pbar p, and e+ e- Interactions

F.E. Paige, S.D. Protopopescu, H. Baer and X. Tata

Isajet 7.88 is dedicated to the memory of Frank Paige, who along with Serban Protopopescu, created Isajet as the first publicly available event generator for colliding beam experiments in the late 1970s.

ISAJET is a Monte Carlo program which simulates p p, pbar p, and e+ e- interactions at high energies.

It is based on perturbative QCD plus phenomenological models for parton and beam jet fragmentation.

The manual describes the physics and explains how to use the program.

ISAJET is written in Fortran 77 (with a few common extensions). While ISAJET was previously distributed using the Patchy code management system contained in Cernlib, the Isajet versions past 7.87 no longer requires Cernlib/Patchy and is distributed as a tarball.

The Isajet tarball can be be unpacked and compiled on any supported Unix system by editing the Makefile and selecting the appropriate options.

Compiling ISAJET on any other computer with ANSI Fortran 77 should be straightforward.

Isajet contains the subprograms Isasugra and Isasusy which are used for generating superparticle mass spectra and decay branching fractions in a variety of supersymmetric models.

Since release 7.72, ISAJET has been interfaced with IsaTools, which contains

IsaRED, subroutines to evaluate the relic density of (stable) neutralino dark matter in the universe;
IsaBSG, subroutines to evalue the branching fraction BF(b -> s gamma);
IsaAMU, subroutines to evaluate supersymmetric contributions to Delta a_mu = (g-2)_mu/2;
IsaBMM, subroutines to evaluate BF(B_s -> mu+ mu-) and BF(B_d -> tau+ tau-) in the MSSM;
IsaRES, subroutines to evaluate the spin-independent and spin-dependent neutralino-proton and neutralino-neutron scattering cross sections for direct detection of dark matter.

In addition to the files for ISAJET, IsaTools files will be automatically unpacked from the isajet.tar file and compiled using the Makefile. Including IsaTools is optional, but it is included by default in the Makefile. See Section 13 of the manual for more information.

We especially thank Alexander Belyaev for his contributions to Isatools.

We express deep thanks to Andrew Box for embedding his RGEFLAV code into Isajet 7.81. The release memo describes changes from the previous version. A history of changes in contained in isajet.car.

Some older .car files are available here.