共查询到20条相似文献,搜索用时 15 毫秒
1.
A recent construction of the electroweak theory, based on perturbative quantum gauge invariance alone, is extended to the case of more generations of fermions with arbitrary mixing. The conditions implied by second order gauge invariance lead to an isolated solution for the fermionic couplings in agreement with the standard model. Third order gauge invariance determines the Higgs potential. The resulting massive gauge theory is manifestly gauge invariant, after construction. 相似文献
2.
3.
Jochen Kripfganz Andreas Laser Michael G. Schmidt 《Zeitschrift fur Physik C Particles and Fields》1997,73(2):353-362
The main perturbative contribution to the free energy of an electroweak interface is due to the effective potential and the tree level kinetic term. The derivative corrections are investigated with one-loop perturbation theory. The action is treated in derivative, in heat kernel, and in a multi local expansion. The massive contributions turn out to be well described by the Z-factor. The massless mode, plagued by infrared problems, is numerically less important. Its perturbatively reliable part can by calculated in derivative expansion as well. A self consistent way to include the Z-factor in the formula for the interface tension is presented. 相似文献
4.
Naive imitation of the usual formulas for compact gauge group in quantizing three dimensional Chern-Simons gauge theory with non-compact gauge group leads to formulas that are wrong or unilluminating. In this paper, an appropriate modification is described, which puts the perturbative expansion in a standard manifestly unitary format. The one loop contributions (which differ from naive extrapolation from the case of compact gauge group) are computed, and their topological invariance is verified.Research supported in part by NSF Grant PHY86-20266 相似文献
5.
6.
Rajpoot S 《Physical review D: Particles and fields》1990,42(7):2359-2362
7.
8.
We demonstrate that the nilpotent Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST symmetry invariance of the Lagrangian density
of a four (3 + 1)-dimensional (4D) non-Abelian 1-form gauge theory with Dirac fields can be captured within the framework
of the superfield approach to BRST formalism. The above 4D theory, where there is an explicit coupling between the non-Abelian
1-form gauge field and the Dirac fields, is considered on a (4,2)-dimensional supermanifold, parametrized by the bosonic 4D
spacetime variables and a pair of Grassmannian variables. We show that the Grassmannian independence of the super-Lagrangian
density, expressed in terms of the (4,2)-dimensional superfields, is a clear signature of the presence of the (anti-)BRST
invariance in the original 4D theory.
相似文献
9.
N. Dombey 《Physics letters. [Part B]》1969,30(9):646-649
The special nature of the Coulomb coupling of a charged particle suggests that non-analytic terms are present in the Regge theory of photoproduction. This provides a natural explanation of the sharp forward peaks observed in charged pion photoproduction off nucleons. A high energy theorem for the forward photoproduction of pseudoscalar mesons follows. 相似文献
10.
11.
Ernest Ma 《Physics letters. [Part B]》1981,100(3):251-253
It is proved that the standard SU(2) × U(1) electroweak gauge model is unique against any extension if the effective low-energy neutral-current interaction is to be precisely of the form naturally. 相似文献
12.
13.
S. Deser 《General Relativity and Gravitation》1970,1(1):9-18
A simple unified closed form derivation of the non-linearities of the Einstein, Yang-Mills and spinless (e.g. chiral) meson systems is given. For the first two, the non-linearities are required by locality and consistency; in all cases, they are determined by the conserved currents associated with the initial (linear) gauge invariance of the first kind. Use of first-order formalism leads uniformly to a simple cubic self-interaction.Supported by USAF OAR under Grant AFOSR 70-1864. 相似文献
14.
We classify, according to the number of independent gauge fields, Poincaré gauge invariant theoretical frameworks of describing gravity into three categories. One of them may provide the dynamical definition of the spin tensor S and that of the energy-momentum tensor T, resulting in the response equation of matter to gravity with the gravitational field strengths, D′ and F, coupled to the former tensors , where the right-hand side represents spin force densities. In the absence of spin the response reduces to the conventional one of general relativity, i.e., without the spin forces. For the electromagnetic field the phase-gauge invariance requires the same conclusion as for a scalar field. For a spin particle there is torsion, which deflects its trajectory from geodesic; an explicit expression for torsion takes a simple form of the axial vector current . 相似文献
15.
We derive the Feynman rules of the standard model in the axial gauge. After this we prove that the fields
and
do not correspond to physical particles. As a consequence, these fields cannot appear as incoming or outgoing lines in Feynman graphs. We then calculate the contribution of these fields in the case of a particular decay mode of the top quark.Received: 28 January 2004, Revised: 12 February 2004, Published online: 8 April 2004 相似文献
16.
The time-independent residual gauge invariance of Hamiltonian lattice gauge theories is considered. Eigenvalues and eigenfunctions of the unperturbed Hamiltonian are found in terms of Gegenbauer's polynomials. Physical states which satisfy the subsidiary condition corresponding to Gauss' law are constructed systematically. 相似文献
17.
C. Leubner 《Physics letters. A》1981,82(5):223-224
A critical assessment is given of the conclusions drawn by Kobe and Wen from their recent investigation of a charged harmonic oscillator in an electromagnetic field as a test of gauge invariance. 相似文献
18.
19.
This series of papers deals with the problem of finding relations between the parameters of the Standard Model of Glashow, Weinberg and Salam. In this first paper, the method of point splitting, suitably modified, is proposed as a useful regularization. When applied to quantum electrodynamics, this point-split regularization is indeed found to have desirable properties. More specifically, to one loop, the photon is shown to remain massless and the photon-photon scattering amplitude gauge invariant. In the following papers, this point-split regularization is applied to the electroweak theory. In the second paper, a first mass relation is obtained from the quadratic divergences. In the third paper, a second mass relation is found from the Higgs interactions. From these two relations, the masses of the Higgs boson and the top quark are determined theoretically for the Standard Model asm
H
=190GeV andm
t
=120GeV.Work supported in part by the Norwegian Research Council for Science and the Humanities 相似文献
20.
O Steinmann 《Annals of Physics》1984,157(1):232-254
A formulation of QED using only gauge invariant fields acting on a physical state space is discussed. The fields are the electromagnetic tensor Fμν and a non-local electron field ψf depending on a quadruple {fμ} of auxiliary functions. The f-ambiguity is physically meaningful: the fμ contain information on the asymptotic configuration of the electromagnetic field accompanying charged particles. Equations of motion are introduced and solved perturbatively, in the sense that expressions for the Wightman functions of the theory are derived. No information on the commutation relations between the basic fields is needed. 相似文献