Supersymmetry and the Nelson-Barr mechanism

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.2214· OSTI ID:6026487

Dine, M; Leigh, R G ^[1]; Kagan, A ^[2]

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1. Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064 (United States)
2. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)

One possible solution to the strong [ital CP] problem is that [ital CP] is an exact symmetry, spontaneously broken at some scale. Some years ago, Nelson and Barr suggested a mechanism for obtaining [theta]=0 at the tree level in this framework and showed that radiative corrections were small in some nonsupersymmetric models. Further investigations suggested that the same could be true in supersymmetric theories. In this paper we show that such solutions assume extraordinarily high degrees of degeneracy among squark masses and among other supersymmetry-breaking parameters. We argue, using naturalness as well as expectations from string theory, that this is not very plausible.

• OSTI ID: 6026487
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:5; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120* -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPOSITE MODELS
CORRECTIONS
CP INVARIANCE
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
INVARIANCE PRINCIPLES
MASS
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
QUARK MODEL
QUARKS
RADIATIVE CORRECTIONS
STRING MODELS
SUPERSYMMETRY
SYMMETRY
SYMMETRY BREAKING