Sphaleron barrier in the presence of fermions

Journal Article · Wed Dec 15 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.5905· OSTI ID:5586594

Nolte, G ^[1]; Kunz, J ^[2]

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1. Fachbereich Physik, Universitaet Oldenburg, Postfach 2503, D-26111 Oldenburg (Germany)
2. Instituut voor Theoretische Fysica, Rijksuniversiteit te Utrecht, NL-3508 TA Utrecht (Netherlands) Fachbereich Physik, Universitaet Oldenburg, Postfach 2503, D-26111 Oldenburg (Germany)

We calculate the minimal energy path over the sphaleron barrier in the presence of fermions, assuming that the fermions of a doublet are degenerate in mass. This allows for spherically symmetric [ital Ansa]$[ital iuml]---[ital tze] for the fields, when the mixing angle dependence is neglected. While light fermions have little influence on the barrier, the presence of heavy fermions ([ital M][sub [ital F]][similar to]1 TeV) strongly deforms the barrier, giving rise to additional sphalerons for very heavy fermions ([ital M][sub [ital F]][similar to]10 TeV). Heavy fermions form nontopological solitons in the vacuum sector.

• OSTI ID: 5586594
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:12; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON NUMBER
ENERGY
EQUATIONS
FERMIONS
FIELD EQUATIONS
MATHEMATICAL MODELS
PARTICLE MODELS
QUASI PARTICLES
SOLITONS
STANDARD MODEL
UNIFIED GAUGE MODELS
VACUUM STATES
VIOLATIONS