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44 \centerline{\Large\bf ISAJET 7.51}
46 \centerline{\Large\bf A Monte Carlo Event Generator}
48 \centerline{\Large\bf for $pp$, $\bar pp$, and $e^+e^-$ Reactions}
50 \centerline{\bf Frank E. Paige and Serban D. Protopopescu}
52 \centerline{Physics Department}
53 \centerline{Brookhaven National Laboratory}
54 \centerline{Upton, NY 11973, USA}
56 \centerline{\bf Howard Baer}
58 \centerline{Department of Physics}
59 \centerline{Florida State University}
60 \centerline{Talahassee, FL 32306}
62 \centerline{\bf Xerxes Tata}
63 \centerline{Department of Physics and Astronomy}
64 \centerline{University of Hawaii}
65 \centerline{Honolulu, HI 96822}
71 \section{Introduction\label{INTRO}}
73 ISAJET is a Monte Carlo program which simulates $pp$,
74 $\bar pp$ and $e^+e^-$ interactions at high energies.
76 perturbative QCD plus phenomenological models for parton and beam jet
77 fragmentation. Events are generated in four distinct steps:
79 \item A primary hard scattering is generated according to the
80 appropriate QCD cross section.
81 \item QCD radiative corrections are added for both the initial and the
83 \item Partons are fragmented into hadrons independently, and particles
84 with lifetimes less than about $10^{-12}$ seconds are decayed.
85 \item Beam jets are added assuming that these are identical to a
86 minimum bias event at the remaining energy.
89 ISAJET incorporates ISASUSY, which evaluates branching ratios for
90 the minimal supersymmetric extension of the standard model. H.~Baer and
91 X.~Tata are coauthors of this package, and they have done the original
92 calculations with various collaborators. See the ISASUSY documentation
93 in the patch Section~\ref{SUSY}.
95 ISAJET is supported for ANSI Fortran and for Cray, DEC Ultrix,
96 DEC VMS, HP/9000 7xx, IBM VM/CMS 370 and 30xx, IBM AIX RS/6000, Linux,
97 Silicon Graphics 4D, and Sun computers. The CDC 7600 and ETA 10
98 versions are obsolete and are no longer supported. It is written
99 mainly in ANSI standard FORTRAN 77, but it does contain some
100 extensions except in the ANSI version. The code is maintained with a
101 combination of RCS, the Revision Control System, and the Patchy code
102 management system, which is part of the CERN Library. The original
103 sources are kept on physgi01.phy.bnl.gov in
104 \verb|~isajet/isalibrary/RCS|; decks revised in release \verb|n.nn|
105 are kept in \verb|~isajet/isalibrary/nnn|. ISAJET is supplied to BNL,
106 CERN, Fermilab, and SLAC; it is also available by anonymous ftp from
108 ftp://penguin.phy.bnl.gov/pub/isajet
110 or by request from the authors.
112 Patch ISAPLT contains the skeleton of an HBOOK histogramming
113 job, a trivial calorimeter simulation, and a jet-finding algorithm.
114 (The default is HBOOK4; HBOOK3 can be selected with a Patchy switch.)
115 These are provided for convenience only and are not supported.