Number of neutrinos in the standard model and its extensions to supersymmetry

Journal Article · Mon Apr 22 00:00:00 EST 1985 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.54.1757· OSTI ID:5473457

Deshpande, N G; Eilam, G; Barger, V; Halzen, F

The measured ratio of production cross sections of W to Z, R = sigma/sup W//sup +/+W/sup -/B(W..-->..e..nu..)/ sigma/sup Z/B(Z..-->..e/sup +/e/sup -/), is barely consistent with the standard model with three families, and puts stringent limits on the number of neutrinos N/sub ..nu../. The effect of supersymmetric extension of the standard model is to strengthen these limits further. Improvement in the measured value of R could not only limit N/sub ..nu../, but also remove from contention some extensions of the standard model.

• Research Organization: Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403
• DOE Contract Number: AC02-76ER00881; AT06-76ER70004
• OSTI ID: 5473457
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 54:16
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
INTERMEDIATE BOSONS
PARTICLE PRODUCTION
STANDARD MODEL
SUPERSYMMETRY
CROSS SECTIONS
ELECTRONS
NEUTRINOS
PAIR PRODUCTION
PHASE SPACE
QUANTUM CHROMODYNAMICS
RENORMALIZATION
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ELEMENTARY PARTICLES
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INTERACTIONS
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MASSLESS PARTICLES
MATHEMATICAL MODELS
MATHEMATICAL SPACE
PARTICLE MODELS
QUANTUM FIELD THEORY
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645203* - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties
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