LHC phenomenology of natural MSSM with non-universal gaugino masses at the unification scale

Hiroyuki Abe, Junichiro Kawamura*, Yuji Omura

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Abstract: In this letter, we study collider phenomenology in the supersymmetric Standard Model with a certain type of non-universal gaugino masses at the gauge coupling unification scale, motivated by the little hierarchy problem. In this scenario, especially the wino mass is relatively large compared to the gluino mass at the unification scale, and the heavy wino can relax the fine-tuning of the higgsino mass parameter, so-called μ-parameter. Besides, it will enhance the lightest Higgs boson mass due to the relatively large left-right mixing of top squarks through the renormalization group (RG) effect. Then 125 GeV Higgs boson could be accomplished, even if the top squarks are lighter than 1 TeV and the μ parameter is within a few hundreds GeV. The right-handed top squark tends to be lighter than the other sfermions due to the RG runnings, then we focus on the top squark search at the LHC. Since the top squark is almost right-handed and the higgsinos are nearly degenerate, 2b + ET miss channel is the most sensitive to this scenario. We figure out current and expected experimental bounds on the lightest top squark mass and model parameters at the gauge coupling unification scale.

本文言語English
論文番号89
ページ(範囲)1-16
ページ数16
ジャーナルJournal of High Energy Physics
2015
8
DOI
出版ステータスPublished - 2015 8月 1

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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