Computation of neutrino masses in R-parity violating supersymmetry: SOFTSUSY3.2

Abstract

The program SOFTSUSY can calculate tree-level neutrino masses in the R-parity violating minimal supersymmetric standard model (MSSM) with real couplings. At tree-level, only one neutrino acquires a mass, in contradiction with neutrino oscillation data. Here, we describe an extension to the SOFTSUSY program which includes one-loop R-parity violating effectsʼ contributions to neutrino masses and mixing. Including the one-loop effects refines the radiative electroweak symmetry breaking calculation, and may result in up to three massive, mixed neutrinos. This paper serves as a manual to the neutrino mass prediction mode of the program, detailing the approximations and conventions used. Program summary Program title: SOFTSUSY Catalogue identifier: ADPM_v3_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ADPM_v3_0.html Program obtainable from: CPC Program Library, Queenʼs University, Belfast, N. Ireland Licensing provisions: GNU General Public License version 3 No. of lines in distributed program, including test data, etc.: 93 291 No. of bytes in distributed program, including test data, etc.: 1 288 618 Distribution format: tar.gz Programming language: C++, Fortran Computer: Personal computer Operating system: Tested on Linux 4.x Word size: 32 bits Classification: 11.1, 11.6 Catalogue identifier of previous version: ADPM_v2_0 Journal reference of previous version: Comput. Phys. Comm. 181 (2010) 232 Does the new version supersede the previous version?: Yes Nature of problem: Calculation of neutrino masses and the neutrino mixing matrix at one-loop level in the R-parity violating minimal supersymmetric standard model. The solution to the renormalisation group equations must be consistent with a high or weak-scale boundary condition on supersymmetry breaking parameters and R-parity violating parameters, as well as a weak-scale boundary condition on gauge couplings, Yukawa couplings and the Higgs potential parameters. Solution method: Nested iterative algorithm. Reasons for new version: Added functionality (computation of all three neutrino masses and their mixings) and bug-fixes. Summary of revisions: • Additional error flags for which particle has become tachyonic. • Allowing tanb(MX) boundary condition. New SOFTSUSY Block 7 allows the user to change the number of loops in calculating Higgs mass and electroweak symmetry breaking calculation to be 1 or 2. • mGMSB fine tuning fixed: thanks to Matthias Hamer for pointing out the bug. • RPV SUSY couplings now able to be set at MZ as well as at SUSY breaking scale. • Default output format from softpoint.x is SLHA. • Fixed third-family mixing contribution to gluino mass. MIXING = − 1 now banned. • Small bug-fix in charged Higgs loop calculation, in gaugino contribution. Now respects Z2 (U1R-PQ) flip exactly due to bug-fixes in gluino mass. • Gravitino default mass changed to Planck scale. • Added one-loop RPV loop corrections to neutrino masses allows computation of neutrino oscillation parameters. Restrictions: SOFTSUSY will provide a solution only in the perturbative régime and it assumes that all couplings of the MSSM are real (i.e. CP-conserving). Running time: A second per parameter point.