BROOKHAVEN NATIONAL LABORATORY MEMORANDUM Date: 30 June 2014 To: ISAJET Users From: F.E. Paige, S.D. Protopopescu, H. Baer, X. Tata Subject: ISAJET 7.84 ISAJET 7.84 is now available. Isajet 7.84 includes several changes. 1. Minor bug fixes implemented in SUGEFF and the fine-tuning measure $\Delta_{EW}$. 2. The LesHouchesAccord (LHA) file is now output to LesHouchesEvents (LHE) file. 3. The sparticle decay table is now output to LHA output file. 4. The ISAHEP routine was updated to allow for proper conversion of STDHEP labels back to ISAJET labels. 5. Isajet LHE file now prints out all subprocess reactions along with differential cross section $d\sigma/dp_t^2$ at $y=0$. In the case of SUSY with ALL jettypes, this can add up to over 2500 subprocesses. Earlier versions of Pythia 6.xx allowed up to 500 subprocesses but Pythia 8 can handle arbitrarily many subprocesses. 6. The Isasusy (pMSSM) code will now output a LHA. Also there is the option to list in the LHA file from Isasusy all $e^+e^-\rightarrow SUSY/Higgs$ total cross sections depending on collider energy $\sqrt{s}$ and beam polarization $P_L(e^-)$ and $P_L(e^+)$ if the flag PRTEESIG is set in the Makefile. Thanks to Azar Mustafayev for help with some of the above.