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

Journal Article · Sun Mar 14 23:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.2468· OSTI ID:7060255

Lopez, J L ^[1]; Nanopoulos, D V ^[2]; Pois, H ^[1]

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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)

We present the results of an extensive exploration of the five-dimensional parameter space of the minimal SU(5) supergravity model, including the constraints of a long enough proton lifetime ([tau][sub [ital p]][gt]1[times]10[sup 32] yr) and a small enough neutralino cosmological relic density ([Omega][sub [chi]][ital h0][sup 2][le]1). We find that the combined effect of these two constraints is quite severe, although still leaving a small region of parameter space with [ital m][sub [ital [tilde g]],][ital [tilde q]][lt]1 TeV. The allowed values of the proton lifetime extend up to [tau][sub [ital p]][approx]1[times]10[sup 33] yr and 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]110 GeV, [ital m][sub [chi]][approx]1/2[ital m][sub [chi]2][sup 0][approx]0.15[ital m][sub [ital [tilde g]]], [ital m][sub [chi]2][sup 0][approx][ital m][sub [chi]1][sup +], and [ital m][sub [chi]][lt]85 (115) GeV, [ital m][sub [chi]2][sup 0],[chi][sub 1][sup +][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]1][sup +][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 the CERN [ital e][sup +][ital e[minus]] collider LEP II.

• DOE Contract Number: FG05-91ER40633
• OSTI ID: 7060255
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:6; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662210 -- Specific Theories & Interaction Models
662360* -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COSMOLOGY
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
HIGGS BOSONS
LIE GROUPS
LIFETIME
LIMITING VALUES
MASS
NUCLEAR POTENTIAL
NUCLEONS
PARTICLE DECAY
POSTULATED PARTICLES
POTENTIALS
PROTONS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SU GROUPS
SU-5 GROUPS
SUPERGRAVITY
SYMMETRY GROUPS
UNIFIED-FIELD THEORIES
YUKAWA POTENTIAL