A Little Solution to the Little Hierarchy Problem: A Vector-like Generation

Details A Little Solution to the Little Hierarchy Problem: A Vector-like Generation A Little Solution to the Little Hierarchy Problem: A Vector-like Generation

2009-10-16

arxiv.org/abs/0910.3020v2

Phys.Rev.D81:055016, 2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 3 figures. v2: Section 3 modified, version to appear in PRD.

Scientific paper

10.1103/PhysRevD.81.055016

We present a simple solution to the little hierarchy problem in the MSSM: a vector-like fourth generation. With O(1) Yukawa couplings for the new quarks, the Higgs mass can naturally be above 114 GeV. Unlike a chiral fourth generation, a vector-like generation can solve the little hierarchy problem while remaining consistent with precision electroweak and direct production constraints, and maintaining the success of the grand unified framework. The new quarks are predicted to lie between ~ 300 - 600 GeV and will thus be discovered or ruled out at the LHC. This scenario suggests exploration of several novel collider signatures.

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