Four Generations, Higgs Physics, and the MSSM
S. Dawson, P. Jaiswal
TL;DR
This paper explores the impact of adding a fourth generation of fermions to the MSSM, showing it can lead to a heavier Higgs but faces significant constraints from data and theoretical consistency.
Contribution
It investigates the phenomenological and theoretical implications of a fourth fermion generation within the MSSM, highlighting constraints and tuning issues.
Findings
Heavier Higgs possible with a fourth generation
Model constrained by electroweak precision data and Higgs searches
Requires specific conditions like tan beta ~ 1 and tuned fermion masses
Abstract
We consider the effects of a fourth generation of chiral fermions within the MSSM. Such a model offers the possibility of having the lightest neutral Higgs boson significantly heavier than in the three generation MSSM. The model is highly constrained by precision electroweak data, along with Higgs searches at the Tevatron. In addition, the requirements of perturbative unitarity and direct searches for heavy quarks imply that the four generation MSSM is only consistent for tan beta ~ 1 and highly tuned 4th generation fermion masses.
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