How to approach continuum physics in the lattice Weinberg-Salam model

Journal Article · Mon Nov 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.093010· OSTI ID:21503773

Zubkov, M A ^[1]

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1. ITEP, Bolshaja Cherjemushkinskaya 25, Moscow, 117259 (Russian Federation)

We investigate the lattice Weinberg-Salam model without fermions numerically for the realistic choice of coupling constants correspondent to the value of the Weinberg angle {theta}{sub W{approx}}30 deg., and bare fine structure constant around {alpha}{approx}(1/150). We consider the values of the scalar self-coupling corresponding to Higgs mass M{sub H{approx}}100, 150, 270 GeV. It has been found that nonperturbative effects become important while approaching continuum physics within the lattice model. When the ultraviolet cutoff {Lambda}=({pi}/a) (where a is the lattice spacing) is increased and achieves the value around 1 TeV, one encounters the fluctuational region (on the phase diagram of the lattice model), where the fluctuations of the scalar field become strong. The classical Nambu monopole can be considered as an embryo of the unphysical symmetric phase within the physical phase. In the fluctuational region quantum Nambu monopoles are dense, and therefore, the use of the perturbation expansion around the trivial vacuum in this region is limited. Further increase of the cutoff is accompanied by a transition to the region of the phase diagram, where the scalar field is not condensed (this happens at the value of {Lambda} around 1.4 TeV for the considered lattice sizes). Within this region further increase of the cutoff is possible, although we do not observe this in detail due to the strong fluctuations of the gauge boson correlator. Both above mentioned regions look unphysical. Therefore we come to the conclusion that the maximal value of the cutoff admitted within lattice electroweak theory cannot exceed the value of the order of 1 TeV.

• OSTI ID: 21503773
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 9; Other Information: DOI: 10.1103/PhysRevD.82.093010; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
COUPLING CONSTANTS
DISTURBANCES
EMBRYOS
EXPANSION
FERMIONS
FINE STRUCTURE
FLUCTUATIONS
GEV RANGE 100-1000
HIGGS BOSONS
HIGGS MODEL
MASS
MONOPOLES
PERTURBATION THEORY
PHASE DIAGRAMS
SYMMETRY
TEV RANGE 01-10
ULTRAVIOLET RADIATION
WEINBERG ANGLE
WEINBERG-SALAM GAUGE MODEL
BOSONS
DIAGRAMS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GEV RANGE
INFORMATION
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
RADIATIONS
TEV RANGE
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
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