1992/10/30 by J. Lopez, Jorge L. Lopez, D.V. Nanopoulos +2 · 4 citations
Computer Science · Physics and Astronomy · #Black Holes and Theoretical Physics #Computational Physics and Python Applications #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.49.343
published as Phys.Rev.D49:343-354,1994 · 29 pages plus nine figures (not included). CTP-TAMU-68/92, CERN-TH.6667/92
arxiv created 1992/10/30 · openalex publication_date 1994/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present the simplest, string-derivable, supergravity model and discuss its experimental consequences. This model is a new string-inspired flipped SU(5) which unifies at the string scale MU=1018 GeV due to the introduction of an additional pair of 10,\stackrel-10 flipped SU(5) representations which contain new intermediate scale "gap" particles. We study various model-building issues which should be addressed in string-derived incarnations of this model. We focus our study on the no-scale supergravity mechanism and explore thoroughly the three-dimensional parameter space of the model (m_\stackrel\ifmmode \else \~\fig,mt,tan\ensuremathβ), thus obtaining several simple relationships among the particle masses, such as m_\stackrel\ifmmode \else \~\fiq\ensuremath≈m_\stackrel\ifmmode \else \~\fig, m_\stackrel\ifmmode \else \~\fieL\ensuremath≈m_\ensuremathν\ensuremath≈0.30m_\stackrel\ifmmode \else \~\fig, m_\stackrel\ifmmode \else \~\fieR\ensuremath≈0.18m_\stackrel\ifmmode \else \~\fig, and m_x20\ensuremath≈2m_x10\ensuremath≈m_x1^\ifmmode±\else\textpm\fi. In a strict interpretation of the no-scale supergravity scenario we solve for tan\ensuremathβ as a function of mt and m_\stackrel\ifmmode \else \~\fig, and show that mt determines not only the sign of the Higgs mixing parameter \ensuremathμ but also whether the lightest Higgs boson mass is above or below 100 GeV. We also find that throughout the parameter space the neutralino relic abundance is within observational bounds (\ensuremathΩxh02\ensuremath\lesssim0.25) and may account for a significant portion of the dark matter in the Universe.