Electroweak supersymmetry around the electroweak scale
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Regular Article - Theoretical Physics
Electroweak supersymmetry around the electroweak scale Taoli Cheng1 , Jinmian Li1 , Tianjun Li1,2,a , Dimitri V. Nanopoulos2,3,4 , Chunli Tong1 1
State Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, P.R. China 2 George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA 3 Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA 4 Division of Natural Sciences, Academy of Athens, 28 Panepistimiou Avenue, Athens 10679, Greece
Received: 19 November 2012 / Revised: 30 January 2013 / Published online: 23 February 2013 © Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica 2013
Abstract Inspired by the phenomenological constraints, LHC supersymmetry and Higgs searches, dark matter search as well as string model building, we propose the electroweak supersymmetry around the electroweak scale: the squarks and/or gluinos are around a few TeV while the sleptons, sneutrinos, bino and winos are within 1 TeV. The higgsinos can be either heavy or light. We consider the bino as the dominant component of dark matter candidate, and the observed dark matter relic density is achieved via the neutralino–stau coannihilations. Considering the Generalized Minimal Supergravity (GmSUGRA), we show explicitly that electroweak supersymmetry can be realized, and gauge coupling unification can be preserved. With two scenarios, we study the viable parameter spaces that satisfy all the current phenomenological constraints, and we present the concrete benchmark points. Furthermore, we comment on the fine-tuning problem and LHC searches.
1 Introduction Supersymmetry (SUSY) provides the most natural solution to the gauge hierarchy problem in the Standard Model (SM). In supersymmetric SMs (SSMs) with R parity, the gauge couplings for SU(3)C , SU(2)L and U (1)Y gauge symmetries are unified at about 2 × 1016 GeV [1–6], the lightest supersymmetric particle (LSP) like neutralino can be cold dark matter candidate [7–9], and the electroweak precision constraints can be evaded, etc. Especially, gauge coupling unification [1–6] strongly suggests Grand Unified Theories (GUTs), which can explain the quantum numbers of the SM fermions and charge quantization elegantly. Thus, the SSMs are the most promising new physics beyond the SM. However, the recent LHC searches for supersymmetry [10–12] a e-mail:
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and Higgs boson [13, 14] have considerably shrunken the viable parameter spaces. Thus, to explore the phenomenologically inspired SSMs, we briefly review the phenomenological constraints in the following: √ • In the s = 7 TeV proton–proton collisions at the LHC with a total integrated luminosity of 4.7 fb−1 , the gluinos masses below 860 GeV and squarks masses below 1320 GeV are excluded at the 95 % Confidence Level (C.L.) in simplified mode
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