Constraints on the minimal supergravity model from nonstandard vacua

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.54.6944· OSTI ID:398540

Baer, H; Brhlik, M; Castano, D ^[1]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

We evaluate regions of parameter space in the minimal supergravity model where {open_quote}{open_quote}unbounded from below{close_quote}{close_quote} (UFB) or charge or color-breaking minima (CCB) occur. Our analysis includes the most important terms from the one-loop effective potential. We note a peculiar discontinuity of results depending on how renormalization group improvement is performed: One case leads to a UFB potential throughout the model parameter space, while the other typically agrees quite well with similar calculations performed using only the tree level potential. We compare our results with constraints from cosmology and naturalness and find a preferred region of parameter space which implies {ital m}{sub {ital {tilde g}}}{approx_lt}725 GeV, {ital m}{sub {ital {tilde q}}}{approx_lt}650 GeV, {ital m}{sub {ital {tilde W}}{sub 1}}{approx_lt}225 GeV, and {ital m}{sub {ital {tilde l}}{sub {ital R}}}{approx_lt}220 GeV. We discuss the consequences of our results for supersymmetry searches at various colliding beam facilities. {copyright} {ital 1996 The American Physical Society.}

• DOE Contract Number: FG05-87ER40319
• OSTI ID: 398540
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 54; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMOLOGY
LIMITING VALUES
POTENTIALS
RENORMALIZATION
SUPERGRAVITY
SUPERSYMMETRY
SYMMETRY BREAKING