Supercollider signatures of supergravity models with Yukawa unification

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.2148· OSTI ID:7171862

Baer, H; Drees, M; Kao, C; Nojiri, M; Tata, X ^[1]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States) Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States) Theory Group, KEK, Oho 1-1, Tsukuba, Ibaraki 305 (Japan) Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822 (United States)

We study the predictions of the simplest SU(5) grand unified model within the framework of minimal supergravity, including constraints from the radiative breaking of electroweak symmetry. As a consequence of the unification of the [ital b]-quark and [tau]-lepton Yukawa couplings, the top quark mass is predicted to be close to its fixed point value. We delineate the regions of the supergravity parameter space consistent with constraints from the nonobservation of proton decay and from the requirement that the lightest supersymmetric particle does not overclose the universe. These constraints lead to a definite pattern of sparticle masses: the feature unique to Yukawa unified models is that some of the third generation squarks are much lighter than those of the first two generations. Despite the fact that all sparticle masses and mixings are determined by just four supersymmetry parameters at the grand unified theory scale (in addition to [ital m][sub [ital t]]), we find that the signals for sparticle production can vary substantially over the allowed parameter space. We identify six representative scenarios and study the signals from sparticle production at the CERN Large Hadron Collider. We find that by studying the signal in various channels, these scenarios may be distinguished from one another, and also from usually studied minimal models'' where squarks and sleptons are taken to be degenerate. In particular, our studies allow us to infer that some third generation squarks are lighter than other squarks---a feature that could provide the first direct evidence of supergravity grand unification.

• DOE Contract Number: FG05-87ER40319; AC02-76ER00881; AM03-76SF00235
• OSTI ID: 7171862
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 50:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Pa
SUPERGRAVITY
YUKAWA POTENTIAL
BEAUTY PARTICLES
GRAND UNIFIED THEORY
SU-5 GROUPS
SYMMETRY BREAKING
TAU PARTICLES
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HEAVY LEPTONS
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
NUCLEAR POTENTIAL
PARTICLE MODELS
POSTULATED PARTICLES
POTENTIALS
SU GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
662440* - Properties of Other Particles Including Hypothetical Particles- (1992-)
661310 - Relativity & Gravitation- (1992-)
662210 - Specific Theories & Interaction Models
Particle Systematics- Unified Theories & Models- (1992-)
662340 - Hadron Interactions- (1992-)