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NMSPEC: A Fortran code for the sparticle and Higgs masses in the NMSSM with GUT scale boundary conditions

Ulrich Ellwanger, Cyril Hugonie

TL;DR

NMSPEC provides a public Fortran framework to compute sparticle and Higgs spectra, decay widths, and couplings in the NMSSM with GUT-scale boundary conditions, treating m_s^2 and appa as derived from Higgs potential minimization. It employs a coupled, iterative RG flow between M_GUT and the weak scale, with internal loops to determine ff, ppa, and m_s^2, and then uses NMHDECAYv3 routines to obtain masses, decays, and experimental-consistency checks, including optional dark matter relic density. The paper updates experimental constraints, refines input conventions, and improves Higgs-mass calculations, reporting at least two distinct NMSSM regions with large mbda and a MSSM-like region, highlighting a scenario where h decays dominantly into two light CP-odd singlet-like states. These advances enable detailed exploration of CNMSSM parameter space, including LEP-constraint-compliant regions with unconventional Higgs decays and associated fine-tuning considerations, with practical implications for LHC phenomenology and NMSSMTools usability.

Abstract

NMSPEC is a Fortran code that computes the sparticle and Higgs masses, as well as Higgs decay widths and couplings in the NMSSM, with soft SUSY breaking terms specified at MGUT. Exceptions are the soft singlet mass m_s^2 and the singlet self coupling kappa, that are both determined in terms of the other parameters through the minimization equations of the Higgs potential. We present a first analysis of the NMSSM parameter space with universal SUSY breaking terms at MGUT -- except for m_s and A_kappa -- that passes present experimental constraints on sparticle and Higgs masses. We discuss in some detail a region in parameter space where a SM-like Higgs boson decays dominantly into two CP odd singlet-like Higgs states.

NMSPEC: A Fortran code for the sparticle and Higgs masses in the NMSSM with GUT scale boundary conditions

TL;DR

NMSPEC provides a public Fortran framework to compute sparticle and Higgs spectra, decay widths, and couplings in the NMSSM with GUT-scale boundary conditions, treating m_s^2 and appa as derived from Higgs potential minimization. It employs a coupled, iterative RG flow between M_GUT and the weak scale, with internal loops to determine ff, ppa, and m_s^2, and then uses NMHDECAYv3 routines to obtain masses, decays, and experimental-consistency checks, including optional dark matter relic density. The paper updates experimental constraints, refines input conventions, and improves Higgs-mass calculations, reporting at least two distinct NMSSM regions with large mbda and a MSSM-like region, highlighting a scenario where h decays dominantly into two light CP-odd singlet-like states. These advances enable detailed exploration of CNMSSM parameter space, including LEP-constraint-compliant regions with unconventional Higgs decays and associated fine-tuning considerations, with practical implications for LHC phenomenology and NMSSMTools usability.

Abstract

NMSPEC is a Fortran code that computes the sparticle and Higgs masses, as well as Higgs decay widths and couplings in the NMSSM, with soft SUSY breaking terms specified at MGUT. Exceptions are the soft singlet mass m_s^2 and the singlet self coupling kappa, that are both determined in terms of the other parameters through the minimization equations of the Higgs potential. We present a first analysis of the NMSSM parameter space with universal SUSY breaking terms at MGUT -- except for m_s and A_kappa -- that passes present experimental constraints on sparticle and Higgs masses. We discuss in some detail a region in parameter space where a SM-like Higgs boson decays dominantly into two CP odd singlet-like Higgs states.

Paper Structure

This paper contains 7 sections, 2 equations, 3 figures, 1 table.

Table of Contents

  1. Introduction
  2. The code NMSPEC
  3. New features in NMHDECAY v3 and NMSPEC
  4. Experimental constraints
  5. Input parameters
  6. Higgs mass
  7. The allowed parameter space of the CNMSSM

Figures (3)

  • Figure 1: Allowed values for $\lambda$ vs. $\tan\beta$ for $M_{1/2}= m_0=500$ GeV, $A_0=-800$ GeV, $A_\kappa=-1500$ GeV.
  • Figure 2: Allowed values for $A_\kappa$ vs. $\lambda$ for $\tan\beta=5$, $M_{1/2}= m_0=500$ GeV and $A_0=-800$ GeV.
  • Figure 3: Allowed values for $A_\kappa$ vs. $A_0$ for $\tan\beta=5$, $M_{1/2}= 200$ GeV, $m_0=100$ GeV and $\lambda=0.2$.