Sphaleron transitions in the minimal standard model and the upper bound for the Higgs boson mass

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.3366· OSTI ID:279221

Diakonov, D; Polyakov, M ^[1]; Sieber, P; Schaldach, J; Goeke, K ^[2]

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1. Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188350 (Russia)
2. Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)

We calculate the dissipation of the baryon number after the electroweak phase transition due to thermal fluctuations above the sphaleron barrier. We consider not only the classical Boltzmann factor but also fermionic and bosonic one-loop contributions. We find that both bosonic and especially fermionic fluctuations can considerably suppress the transition rate. Assuming the Langer-Affleck formalism for this rate, the condition that an initial baryon asymmetry must not be washed out by sphaleron transitions leads, in the minimal standard model (sin{theta}{sub {ital W}}=0), to an upper bound for the Higgs boson mass in the range 60 to 75 GeV. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279221
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 6 Vol. 53; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARYON NUMBER
FLUCTUATIONS
HIGGS BOSONS
LIMITING VALUES
MASS
PHASE TRANSFORMATIONS
STANDARD MODEL