Simplest, string-derivable, supergravity model and its experimental predictions

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.343· OSTI ID:5288457

Lopez, J L ^[1]; Nanopoulos, D V ^[2]; Zichichi, A ^[3]

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1. Center for Theoretical Physics, Department of Physics, Texas A M University, College Station, Texas 77843-4242 (United States) Astroparticle Physics Group, Houston Advanced Research Center (HARC), The Woodlands, Texas 77381 (United States)
2. Center for Theoretical Physics, Department of Physics, Texas A M University, College Station, Texas 77843-4242 (United States) Astroparticle Physics Group, Houston Advanced Research Center (HARC), The Woodlands, Texas 77381 (United States) CERN Theory Division, 1211 Geneva 23 (Switzerland)
3. CERN, Geneva (Switzerland)

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 [ital M][sub [ital U]]=10[sup 18] GeV due to the introduction of an additional pair of 10,1[bar 0] 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 ([ital m][sub [ital [tilde g]]],[ital m][sub [ital t]],tan[beta]), thus obtaining several simple relationships among the particle masses, such as [ital m][sub [ital [tilde q]]][approx][ital m][sub [ital [tilde g]]], [ital m][sub [ital [tilde e]]][ital L][approx][ital m][sub n][tilde u][approx]0.30[ital m][sub [ital [tilde g]]], [ital m][sub [ital [tilde e]][ital R]][approx]0.18[ital m][sub [ital [tilde g]]], and [ital m][sub [chi]2][sup 0][approx]2[ital m][sub [chi]1][sup 0][approx][ital m][sub [chi]1][sup [plus minus]]. In a strict interpretation of the no-scale supergravity scenario we solve for tan[beta] as a function of [ital m][sub [ital t]] and [ital m][sub [ital [tilde g]]], and show that [ital m][sub [ital t]] determines not only the sign of the Higgs mixing parameter [mu] 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 ([Omega][sub [chi]][ital h0][sup 2][approx lt]0.25) and may account for a significant portion of the dark matter in the Universe.

• DOE Contract Number: FG05-91ER40633
• OSTI ID: 5288457
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FIELD THEORIES
HIGGS BOSONS
LIE GROUPS
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
QUARK MODEL
STRING MODELS
SU GROUPS
SU-5 GROUPS
SUPERGRAVITY
SUPERSYMMETRY
SYMMETRY
SYMMETRY BREAKING
SYMMETRY GROUPS
THREE-DIMENSIONAL CALCULATIONS
UNIFIED-FIELD THEORIES