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Post Info TOPIC: Special unitary group SU(5)
Blobrana


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RE: Special unitary group SU(5)
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Title: Likelihood Analysis of Supersymmetric SU(5) GUTs
Author: E. Bagnaschi, J.C. Costa, K. Sakurai, M. Borsato, O. Buchmueller, R. Cavanaugh, V. Chobanova, M. Citron, A. De Roeck, M.J. Dolan, J.R. Ellis, H. Flächer, S. Heinemeyer, G. Isidori, M. Lucio, D. Martínez Santos, K.A. Olive, A. Richards, K.J. de Vries, G. Weiglein

We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has 7 parameters: a universal gaugino mass m_{1/2}, distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), m_5 and m_10, and for the 5 and (\bar 5) Higgs representations m_{H_u} and m_{H_d}, a universal trilinear soft SUSY-breaking parameter A_0, and the ratio of Higgs vevs tan beta. In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + MET events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously-identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel {\tilde u_R}/{\tilde c_R} - \tilde{\chi}^0_1 coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of {\tilde \nu_\tau} coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.

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Blobrana


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Posts: 131433
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F-SU(5)
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Title: Primordial Synthesis: F-SU(5) SUSY Multijets, 145-150 GeV LSP, Proton & Rare Decays, 125 GeV Higgs Boson, and WMAP7
Authors: Tianjun Li, James A. Maxin, Dimitri V. Nanopoulos, Joel W. Walker

We examine the first ATLAS Collaboration 8 TeV 5.8/fb supersymmetry (SUSY) multijet data observations in the context of No-Scale Flipped SU(5) with extra TeV-Scale vector-like flippon multiplets, dubbed F-SU(5), finding that the recent 8 TeV collider data is statistically consistent with our prior 7 TeV results. Furthermore, we synthesize all currently ongoing experiments searching for beyond the Standard Model (BSM) physics with this fit to the 8 TeV data, establishing a suggestive global coherence within a No-Scale F-SU(5) high-energy framework. The SUSY mass scale consistent with all BSM data consists of the region of the F-SU(5) model space within 660 ~< M_{1/2} ~< 760 GeV, which corresponds to sparticle masses of 133 ~< M(chi_1^0) ~< 160 GeV, 725 ~< M(t_1) ~< 845 GeV, and 890 ~< M(g) ~< 1025 GeV. We suggest that the tight non-trivial correspondence between the SUSY multijets, direct and indirect searches for dark matter, proton decay, rare-decay processes, the observed Higgs boson mass, and the measured dark matter relic density, is strongly indicative of a deeper fundamental relationship. We additionally suggest a simple mechanism for enhancing the capture efficiency of F-SU(5) SUSY multijets, which results in a 93% suppression in ATLAS reported background events, but only a 27% decrease in Monte Carlo simulated F-SU(5) multijet events.

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Blobrana


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Posts: 131433
Date:
Special unitary group SU(5)
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Title: A Renormalisable Supersymmetric SU(5) Model
Authors: Jun-hui Zheng, Da-Xin Zhang

In the Supersymmetric SU(5) Model of Unification with the Missing Partner Mechanism, we present a renormalisable model using the Georgi-Jarlsog mechanism to describe the fermion masses and mixing. At the meantime the proton decay rates are also suppressed to satisfy the experimental data.

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