The Effective MSSM

TL;DR

This paper introduces an effective field theory framework called EffMSSM, which modifies the gauge-Higgs sector of the MSSM to explore new interactions and phenomenological features, including accommodating a 125 GeV Higgs.

Contribution

It proposes a novel representation of the gauge-Higgs sector in the MSSM using nonlinear realizations, allowing for new interactions and phenomenological implications.

Findings

EffMSSM can naturally accommodate a 125 GeV Higgs boson.

The new framework predicts distinct features in Higgs and gaugino sectors.

Modified interactions lead to potential observable deviations from MSSM.

Abstract

We suggest an effective field theory framework to discuss deviations from the minimal supersymmetric Standard Model (MSSM) which is based on an alternative arrangement of the gauge-Higgs sector. In this effective MSSM (EffMSSM) nonlinearly realised $SU(2)\times U(1)$ gauge sector is described by an $SU(2)\times U(1)$-valued massive vector superfield, which contains a neutral CP-even and charged Higgs fields, while another neutral CP-even Higgs and the neutral CP-odd Higgs fields are residing in an $SU(2)\times U(1)$-singlet chiral superfield. Although the new theory contains the same particle content as the conventional MSSM, the unconventional representation of superfields allows for new type of interactions, which may lead to a significant modification of the phenomenology. As an illustrative example we consider EffMSSM with modified Higgs and electroweak gauge sector augmented by gaugino soft supersymmetry breaking masses, $M_i~ (i=1,2,3)$ and the Standard Higgs soft-breaking masses, $m_{H_u}=m_{H_d}$ and $B_{\mu}$, and point out distinct features in the Higgs and gaugino sectors as compared to MSSM. In particular, we show that the lightest neutral CP-even Higgs boson with mass $\sim 125$ GeV can be easily accommodated within EffMSSM.