MicrOMEGAs: Version 1.3

micrOMEGAs 2.0: A program to calculate the relic density of dark matter in a generic model

Higher order corrections and unification in the minimal supersymmetric standard model: SOFTSUSY3.5

The modest addition of the dimension-5 term λ(Hˆu⋅Hˆd)2/M to the superpotential of the minimal supersymmetric standard model (MSSM) originated from physics beyond the MSSM (BMSSM) has a significant impact on the scenario of the Higgsino-dominated neutralino state being the lightest supersymmetric particle (LSP). It increases the mass difference between the LSP and the lighter chargino as well as that between the LSP and the second-lightest neutralino. This enhances the LHC discovery potential of the chargino and neutralino decays, producing more energetic charged leptons or pions than the decays without the BMSSM corrections. Furthermore, the coannihilation between the lighter chargino or second-lightest neutralino and the LSP is reduced substantially such that the LSP mass does not have to be very heavy. Consequently, an almost pure Higgsino LSP with its mass ∼100 GeV in the BMSSM can account for all the relic density of cold dark matter in the Universe unless tanβ is too large.

NMSDECAY: A Fortran code for supersymmetric particle decays in the Next-to-Minimal Supersymmetric Standard Model

Top quark and Higgs boson masses: Interplay between infrared and ultraviolet physics

We investigate the possibility of satisfying the $SU(5)$ boundary condition $\mathbf{Y}^d=\mathbf{Y}^{e\,T}$ at the GUT scale within the renormalizable $R$-parity conserving Minimal Supersymmetric Standard Model (MSSM). Working in the super-CKM basis, we consider non-zero flavour off-diagonal entries in the soft SUSY-breaking mass matrices and the $A$-terms. At the same time, the diagonal $A$-terms are assumed to be suppressed by the respective Yukawa couplings. We show that a non-trivial flavour structure of the soft SUSY-breaking sector can contribute to achieving precise Yukawa coupling unification for all the three families. However, large non-zero values of the flavour-violating parameter $(m^2_{dl})_{12}$ lead to a strong tension with the Lepton Flavour Violating (LFV) observables. Nevertheless, the LFV problem does not arise when the Yukawa coupling unification requirement is restricted to the second and third families only. We demonstrate that such a scenario is consistent with a wide set of experimental constraints, including flavour and electroweak observables, Higgs physics and the LHC bounds. We also point out that in order to provide a proper value for the relic density of dark matter, the lightest neutralino needs to be almost purely bino-like and with mass in the range of 200$\div$600 GeV. Such a clear experimental prediction makes the flavour-violating $SU(5)$ Yukawa unification scenario fully testable at the LHC 14 TeV.

The technique for identification (determination of the parameters) of the model of high-pressure discharge lamp by comparing the simulated and experimental data was developed. Searching for the model parameters is divided into two main stages: 1) determining the degree of influence of each parameter change on the model output; 2) directly searching for the minimum functional divergence. Divergence evaluation is carried out by determining the value of the functional - the sum of the squares of divergences during the studied time period. When searching for minimum divergence, a corresponding set of model parameters is determined. The technique for determining the parameters of the mathematical model of high-pressure discharge lamp was designed to determine such parameters of the model, which allow to describe it with the necessary precision. Trial computational experiment showed the performance of the model parameter determination program, developed using the technique. It was found that the models that are based on the current-voltage characteristics of lamps are promising. The need to determine the model parameters is caused by the requirement for the accuracy of the research, and the availability of regular deviations in characteris­tics of lamps of the same type from different manufacturers, batches and even between units in batches from that of manufacturers and general. Ensuring the model accuracy is also important in developing and creating complex control systems that can be realized with microprocessor control, where the model is used for calculating the control object behavior and selecting control signals.

GravitinoPack and decays of supersymmetric metastable particles

Information theory has proven to be a worthwhile tool for investigating the implications of the Higgs sector in the Next‐to‐Minimal Supersymmetric Standard Model (NMSSM) using Higgs information at the Large Hadron Collider (LHC) assessed through the entropy constructed by means of the branching ratios of decay channels of the Higgs boson. The present article focuses on the parameter space of supersymmetric extension with an extra term of singlet in light of various experimental constraints. Our findings show the most preferred values of m0, m1/2, A0, tanβ, λ, μeff, neutralino lightest supersymmetric particle (LSP) , lighter chargino , singlino , and gluino to be around 1.93 TeV, 1.78 TeV, −3.62 TeV, 27.5, 0.012, 665.7 GeV, 740 GeV, 790 GeV, 11.24 TeV, and 3.70 TeV, respectively, that is compatible with the relic density of dark matter.

We investigate the phenomenological effects of the nonholomorphic (NH) higgsino mass term, μ′, within the minimal supersymmetric standard model (MSSM) extended by a non-abelian flavor symmetry, referred to as the sNHSSM. This flavor symmetry enables a substantial reduction in the number of free parameters inherent to the MSSM, streamlining them from a large set to just eight. Our study explores the interplay between cold dark matter (CDM) relic density (ΩCDMh2) and the anomalous magnetic moment of the muon, (g−2)μ. We study correlations among the theoretical parameters that emerge from this interplay and are further constrained by experimental data such as the Higgs boson mass, B-physics observables, and the charge and color breaking minima constraints. Moreover, our findings reveal that incorporating the NH higgsino mass term opens up new regions of parameter space that were previously inaccessible.

Review Article

The soft supersymmetry-breaking Lagrangian: theory and applications

The paper deals with determination of parameters of a dispersion model used for describing the flow of liquid on a plate with mobile packing in the region of gas velocities up to 1.5 m s-1. The parameters of the model - the diffusion Peclet number and mean residence time of liquid - were determined from the nonideal input impulse of tracer concentration and its response by the method of numerical integration of differential equation with subsequent optimization of parameters. The results of measurements are presented graphically and in the form of criterion equations.

Fortran programs for the time-dependent Gross–Pitaevskii equation in a fully anisotropic trap

Motivated by the naturalness, we study a simplified Minimal Supersymmetric Standard Model (MSSM) scenario where only the bino-like lightest supersymmetric particle (LSP) and higgsino-like next-lightest supersymmetric particle (NLSP) are light. We first scan the parameter space of this scenario, considering the constraints from the Higgs mass, flavor physics, electroweak precision measurements and dark matter experiments. Then in the allowed parameter space, we perform a Monte Carlo simulation for the [Formula: see text] production followed by [Formula: see text] and [Formula: see text]. By examining the presently available trilepton bounds on the wino-like chargino/neutralino, we find that only a narrow region [Formula: see text] and [Formula: see text] on the plane of [Formula: see text] can be excluded. Finally, we explore the potential of trilepton signature in probing such a scenario at 14 TeV Large Hadron Collider (LHC) and find that the region with [Formula: see text] and [Formula: see text] can be covered at [Formula: see text] level with luminosity [Formula: see text].