Proton decay and cosmology strongly constrain the minimal [ital SU](5) supergravity model

Conference · Wed Feb 05 04:00:00 EST 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6697046

Lopez, J L; Nanopoulos, D V; Pois, H ^[1]

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1. Department of Physics, Texas A M University, College Station, Texas 77843-4242 (United States)

We present the results of an extensive exploration of the five-dimensional parameter space of the minimal [ital SU](5) supergravity model, including the constraints of a long enough proton lifetime and a small enough neutralino cosmological relic density. We find that the combined effect of these two constraints is never quite severe, although still leaving a small region of parameter space with [ital m][sub [ital [tilde g]]],[ital [tilde g]][lt]1 TeV. The allowed values of the proton lifetime should be fully explored by the SuperKamiokande experiment. The proton lifetime cut also entails the following mass correlations and bounds: [ital m][sub [ital h]][approx lt]100 GeV, [ital m][sub [ital x]][approx]1/2 [ital m][sub [ital x][sup 0][sub 2]][approx]0.15[ital m][sub [ital [bar g]]], [ital m][sub [chi][sup 0][sub 2]][approx] [ital m][sub [chi][sup +][sub 1]] , and [ital m][sub [chi]][lt]85(115) GeV, [ital m][sub [chi][sup 0][sub 2]],[sub [chi][sup +][sub 1]][lt]165(225) GeV for [alpha][sub 3]=0.113(0.120). Finally, the [ital combined] proton decay and cosmology constraints predict that if [ital m][sub [ital h]][approx gt]75(80) GeV then [ital m][sub [chi][sup +][sub 1]][approx lt]90(110) GeV for [alpha][sub 3]=0.113(0.120). Thus, if this model is correct, at least one of these particles will likely be observed at LEPII.

• OSTI ID: 6697046
• Report Number(s): CONF-920837--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 272:2
• Country of Publication: United States
• Language: English

Related Subjects

662360* -- Decays of Baryons-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
COSMOLOGY
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GLUONS
HADRONS
HIGGS BOSONS
LIE GROUPS
LIFETIME
MASS SPECTRA
NUCLEONS
PARTICLE DECAY
POSTULATED PARTICLES
PROTONS
SPECTRA
SU GROUPS
SU-5 GROUPS
SUPERGRAVITY
SYMMETRY GROUPS
UNIFIED-FIELD THEORIES