Little solution to the little hierarchy problem: A vectorlike generation

Citation Graham, Peter W. et al. " Little solution to the little hierarchy problem: A vectorlike generation. " Physical Review D 81.5 (2010): 055016. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We present a simple solution to the little hierarchy problem in the minimal supersymmetric standard model: a vectorlike fourth generation. With Oð1Þ Yukawa couplings for the new quarks, the Higgs mass can naturally be above 114 GeV. Unlike a chiral fourth generation, a vectorlike 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.