Sphaleron effects near the critical temperature

Journal Article · Wed Dec 14 23:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.7650· OSTI ID:6882299

Hellmund, M ^[1]; Kripfganz, J; Schmidt, M G ^[2]

---

1. Institut fuer Theoretische Physik der Universitaet Leipzig, D-04109, Liepzig (Germany)
2. Institut fuer Theoretische Physik der Universitaet Heidelberg, D-69120, Heidelberg (Germany)

We discuss one-loop radiative corrections to the sphaleron-induced baryon-number-violating transition rate near the electroweak phase transition in the standard model. We emphasize that in the case of a first-order transition a rearrangement of the loop expansion is required close to the transition temperature. The corresponding expansion parameter, the effective three-dimensional gauge coupling, approaches a finite [lambda]-dependent value at the critical temperature. The [lambda] (Higgs boson mass) dependence of the one-loop radiative corrections is discussed in the framework of the heat kernel method. Radiative corrections are small compared to the leading sphaleron contribution as long as the Higgs boson mass is small compared to the [ital W] mass. To one-loop accuracy, there is no Higgs boson mass range compatible with experimental limits where washing out of a [ital B]+[ital L] asymmetry could be avoided for the minimal standard model with one Higgs doublet.

• OSTI ID: 6882299
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:12; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662210 -- Specific Theories & Interaction Models
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYON NUMBER
CORRECTIONS
CRITICAL TEMPERATURE
ELEMENTARY PARTICLES
HIGGS BOSONS
MATHEMATICAL MODELS
PARTICLE MODELS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
RADIATIVE CORRECTIONS
STANDARD MODEL
THERMODYNAMIC PROPERTIES
THREE-DIMENSIONAL CALCULATIONS
TRANSITION TEMPERATURE
UNIFIED GAUGE MODELS
VIOLATIONS