New constraints on supergravity models from [ital b][r arrow][ital s][gamma]

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.147· OSTI ID:6698170

Lopez, J L; Nanopoulos, D V; Wang, X; Zichichi, A ^[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 Mitchell Campus, The Woodlands, Texas 77381 (United States) CERN Theory Division, 1211 Geneva 23 (Switzerland) CERN, 1211 Geneva 23 (Switzerland)

We perform a detailed study of the constraints from [ital b][r arrow][ital s][gamma] on a large class of supergravity models, including generic four-parameter supergravity models, the minimal SU(5) supergravity model, and SU(5)[times]U(1) supergravity. For each point in the parameter spaces of these models we obtain a range of [ital B]([ital b][r arrow][ital s][gamma]) values which should conservatively account for the unknown next-to-leading-order QCD corrections. We then classify these points into three categories: excluded'' points have ranges of [ital B]([ital b][r arrow][ital s][gamma]) which do not overlap with the experimentally allowed range, preferred'' points have [ital B]([ital b][r arrow][ital s][gamma]) ranges which overlap with the standard model prediction, and okay'' points are neither excluded'' nor preferred'' but may become excluded'' should new CLEO data be consistent with the standard model prediction. In [ital all] cases we observe a strong tendency for the preferred'' points towards one sign of the Higgs mixing parameter [mu]. For the opposite sign of [mu] there is an upper bound on tan[beta]: tan [beta][approx lt]25 in general, and tan [beta][approx lt]6 for the preferred'' points. We conclude that new CLEO data will provide a decisive test of supergravity models.

• DOE Contract Number: FG05-91ER40633
• OSTI ID: 6698170
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662210 -- Specific Theories & Interaction Models
662390* -- Electromagnetic Processes & Properties-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BEAUTY PARTICLES
CORRECTIONS
DECAY
ELEMENTARY PARTICLES
FIELD THEORIES
LIE GROUPS
PARTICLE DECAY
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
RADIATIVE DECAY
SU GROUPS
SU-5 GROUPS
SUPERGRAVITY
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
UNIFIED-FIELD THEORIES