NONUNIVERSAL GAUGINO MASSES AND NATURAL SUPERSYMMETRY

作者：Gogoladze Ilia^*; Nasir Fariha; Shafi Qaisar

来源：International Journal of Modern Physics A, 2013, 28(13): 1350046.

DOI：10.1142/S0217751X13500462

• Natural supersymmetry
• little hierarchy
• nonuniversal gaugino

We demonstrate that natural supersymmetry is readily realized in the framework of SU(4)(c) x SU(2)(L) x SU(2)(R) with nonuniversal gaugino masses. Focusing on ameliorating the little hierarchy problem, we explore the parameter space of this model which yields small fine-tuning measuring parameters (natural supersymmetry) at the electroweak scale (Delta EW) as well as at high scale (Delta HS). It is possible to have both Delta EW and Delta HS less than 100 in these models, (2% or better fine-tuning), while keeping the light CP-even (Standard Model-like) Higgs mass in the 123-127 GeV range. The light stop quark mass lies in the range 700 GeV %26lt; m(%26lt;(t)over tilde%26gt;1) %26lt; 1500 GeV, and the range for the light stau lepton mass is 900 GeV %26lt; m((T) over bar1) %26lt; 1300 GeV. The first two family squarks are in the mass range 3000 GeV %26lt; m ((t) over tilde1) %26lt; 4500 GeV, and for the gluino we find 2500 GeV %26lt; m((g) over bar1) %26lt; 3500 GeV. We do not find any solution with natural supersymmetry which yields significant enhancement for Higgs production and decay in the diphoton channel.

• 出版日期2013-5-20