The New Minimal Standard Model

Abstract

We construct the New Minimal Standard Model that incorporates the new discoveries of physics beyond the Minimal Standard Model (MSM): Dark Energy, non-baryonic Dark Matter, neutrino masses, as well as baryon asymmetry and cosmic inflation, adopting the principle of minimal particle content and the most general renormalizable Lagrangian. We base the model purely on empirical facts rather than aesthetics. We need only six new degrees of freedom beyond the MSM. It is free from excessive flavor-changing effects, CP violation, too-rapid proton decay, problems with electroweak precision data, and unwanted cosmological relics. Any model of physics beyond the MSM should be measured against the phenomenological success of this model.

Figures (2)

• Figure 1: The region of the NMSM parameter space $(k(m_Z), m_h)$ that satisfies the stability and triviality bounds, for $h(m_Z)=0$, 1.0, and 1.2. Also the preferred values from the cosmic abundance $\Omega_S h^2 = 0.11$ are shown for various $m_S$. We used $y(m_Z)=1.0$.
• Figure 2: The elastic scattering cross section of Dark Matter from nucleons in NMSM, as a function of the Dark Matter particle mass $m_S$ for $m_h=150$ GeV. Note that the region $m_S \gtrsim 1.8$ TeV is disallowed by the triviality bound on $k$. Also shown are the experimental bounds from CDMS-II :2004fq and DAMA Bernabei:2003za, as well as improved sensitivities expected in the future dmtools.