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

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

Peter W. Graham
(
- Stanford U., Phys. Dept.
)
,
Ahmed Ismail
(
- Stanford U., Phys. Dept.
)
,
Surjeet Rajendran
(
- MIT, LNS and
- SLAC and
- Stanford U., Phys. Dept.
)
,
Prashant Saraswat
(
- Stanford U., Phys. Dept.
)

Oct, 2009

19 pages

Published in:

Phys.Rev.D 81 (2010) 055016

e-Print:

0910.3020 [hep-ph]

DOI:

10.1103/PhysRevD.81.055016

Report number:

SLAC-PUB-14931,
MIT-CTP-4078

View in:

ADS Abstract Service

reference search129 citations

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Abstract: (arXiv)

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.

Note:

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

12.10.-g
12.60.Jv
14.80.Da
14.65.Jk
family: 4
coupling: Yukawa
coupling: gauge
mass: hierarchy
minimal supersymmetric standard model
electroweak interaction

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