Abstract
We describe an extension of the SOFTSUSY spectrum calculator to include two-loop supersymmetric QCD (SUSYQCD) corrections of order O(αs2) to gluino and squark pole masses, either in the minimal supersymmetric standard model (MSSM) or the next-to-minimal supersymmetric standard model (NMSSM). This document provides an overview of the program and acts as a manual for the new version of SOFTSUSY, which includes the increase in accuracy in squark and gluino pole mass predictions. Program summaryProgram title:SOFTSUSYProgram Files doi:http://dx.doi.org/10.17632/sh77x9j7hs.1Licensing provisions: GNU GPLv3Programming language:C++, fortran, CNature of problem: Calculating supersymmetric particle spectrum, mixing parameters and couplings in the MSSM or the NMSSM. The solution to the renormalization group equations must be consistent with theoretical boundary conditions on supersymmetry breaking parameters, as well as a weak-scale boundary condition on gauge couplings, Yukawa couplings and the Higgs potential parameters.Solution method: Nested fixed point iteration.Restrictions:SOFTSUSY will provide a solution only in the perturbative regime and it assumes that all couplings of the model are real (i.e. CP−conserving). If the parameter point under investigation is non-physical for some reason (for example because the electroweak potential does not have an acceptable minimum), SOFTSUSY returns an error message. The higher order corrections included are for the MSSM (R-parity conserving or violating) or the real R-parity conserving NMSSM only.Journal reference of previous version: Comput. Phys. Comm. 189 (2015) 192.Does the new version supersede the previous version?: Yes.Reasons for the new version: It is desirable to improve the accuracy of the squark and gluinos mass predictions, since they strongly affect supersymmetric particle production cross-sections at colliders.Summary of revisions: The calculation of the squark and gluino pole masses is extended to be of next-to-next-to leading order in SUSYQCD, i.e. including terms up to O(gs4∕(16π2)2).Additional comments: Program obtainable from http://softsusy.hepforge.org/
Highlights
Near the beginning of LHC Run II at 13 TeV centre of mass collision energy, hopes are high for the discovery of new physics
Summary of revisions: The calculation of the squark and gluino pole masses is extended to be of next-to-next-to leading order in supersymmetric QCD (SUSYQCD), i.e. including terms up to O(g4s/(16π2)2)
We expect them to be useful in increasing the accuracy of inference from data of supersymmetry breaking in the squark and gluino sectors
Summary
Program title: SOFTSUSY Program obtainable from: http://softsusy.hepforge.org/ Distribution format: tar.gz Programming language: C++, fortran, C Computer: Personal computer. Nature of problem: Calculating supersymmetric particle spectrum, mixing parameters and couplings in the MSSM or the NMSSM. Restrictions: SOFTSUSY will provide a solution only in the perturbative regime and it assumes that all couplings of the model are real (i.e. CP−conserving). If the parameter point under investigation is non-physical for some reason. The higher order corrections included are for the MSSM (R−parity conserving or violating) or the real R−parity conserving NMSSM only. Does the new version supersede the previous version?: Yes. Reasons for the new version: It is desirable to improve the accuracy of the squark and gluinos mass predictions, since they strongly affect supersymmetric particle production cross-sections at colliders. Summary of revisions: The calculation of the squark and gluino pole masses is extended to be of next-to-next-to leading order in SUSYQCD, i.e. including terms up to O(g4s/(16π2)2)
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