Showing papers in "Nuclear Physics in 1978"

TL;DR: In this article, it was shown that the fixing of the divergence of the potential in non-Abelian theories does not fix its gauge and that the ambiguity in the definition of potential leads to the fact that, when integrating over the fields in the functional integral, it is apparently enough for us to restrict ourselves to the potentials for which the Faddeev-Popov determinants are positive.

TL;DR: In this article, it is shown that the topological operators and the gauge field operators form a closed algebra from which it is deduced that this system can be in one of the four different phases: (i) spontaneous breakdown via an explicit or composite Higgs field, (ii) no Higgs fields but permanent confinement of gauge quantum numbers, (iii) Higgs effect and still confinement, presumably only if there is an unbroken subgroup, and (iv) an intermediate phase (critical point?) with massless particles.

TL;DR: In this article, all manifest supersymmetries in more than 1 + 1 dimensions, including those with conformal or de Sitter space-time symmetry, were determined and the structure of all representations and formulae for an effective computation were given.

TL;DR: In this article, a model of the properties of the jet of mesons generated by a fast outgoing quark is presented, where the meson that contains the original quark leaves momentum and flavor to a remaining jet in which the particles are distributed like those of the original jet.

TL;DR: In this article, the SU(5) model was applied to the strong and other elementary particle interactions and the proton lifetime was estimated in theories with second-order baryon number violation, and found to be O(103-104) longer than naive dimensional counting suggested.

TL;DR: In this article, the authors formulate and discuss the recently discovered C P n−1 non-linear σ models in two dimensions and find that the fundamental particles in these theories are confined by a topological Coulomb force.

TL;DR: In this article, a zeta function regularization of the one-loop term for gravity was proposed to obtain a non-trivial scaling behavior in cases in which the background metric has non-zero curvature tensor.

TL;DR: In this paper, asymptotic freedom is discussed as an aspect of the response of a charged vector field to an external homogeneous magnetic field, and it is shown that there exists an unstable mode of the field.

TL;DR: In this paper, the interacting boson model provides us with a unified phenomenological description of vibrational, rotational and transitional nuclei, and it has been shown that the model can provide a unified description of nuclei.

TL;DR: In this article, a system of equations which must be satisfied by multiparticle matrix elements of any local operator in field theories with soliton behaviour is derived, and the form factors of various operators of interest are calculated exactly by means of the known exact S-matrices in the sine-Gordon, massive Thirring, nonlinear σ−, and Gross-Neveu models.

TL;DR: In this article, a formulation of gauge theories with an extended supersymmetry for N = 2 is given in terms of superfields and component fields as well as the Lagrangian.

TL;DR: In this paper, it was shown that the Q 2 dependence of parton distributions as given by asymptotically free gauge theories can be represented by simple analytic expressions and that the sea distributions can be read directly from the first two moments.

TL;DR: In this article, supertwistors that extend the twistor concept to supersymmetry are introduced and studied, and using them the superconformal algebra SU(2, 2| N ) and its supermultiplets are derived.

TL;DR: In this article, it was shown that finite energy solutions of the field equations of the non-linear σ-model decay asymptotically into massless lumps.

TL;DR: In this article, the problem of going beyond the leading logarithmic approximation in QCD for leptoproduction and Drell-Yan processes is considered and the question of a convenient definition of effective parton densities appropriate at this level of accuracy is discussed.

TL;DR: In this paper, a factorized total S -matrix in two space-time dimensions with isotopic O(n) symmetry was constructed, and it was shown that this S-matrix is the exact one of the O( n ) chiral field.

TL;DR: Conserved non-local charges are shown to exist in the quantum non-linear σ-model by a non-perturbative method as discussed by the authors, which imply the absence of particle production and the factorization equations for the two-particle S-matrix, which can then be calculated explicitly.

TL;DR: In this paper, the second-order weak correction to the anomalous magnetic moment of the muon in an arbitrary gauge model was studied and a lower bound of 35 GeV for the lightest neutral boson was obtained.

TL;DR: In this article, it was shown that the 1/N expansion of the SU(N) thirring model vanishes in the two-dimensional XY model.

TL;DR: In this article, the results obtained from consideration of the effective Lagrangian density asymptotic behaviour in gauge theories by means of the renormalization-group method are discussed.

TL;DR: In this article, the SU(4) supersymmetric gauge theory with central charges was studied and it was shown that the theory has a larger SU (4) invariance once the equations of motion are used.

TL;DR: In this paper, a supersymmetric generalization of various tensors of differential geometry, such as the metric tensor and the Riemann, Einstein and Weyl tensors, is given, at the linearized level.

TL;DR: In this paper, an effective action in which the gauge field coupling constant g is replaced by the effective coupling g (t), t = ln [ F μν a ) 2 μ 4 ].

TL;DR: In this paper, the authors obtained at all orders the factorization of mass singularities for every hard QCD process, which appeared in a universal factor that can be reabsorbed into the standard parton density.

TL;DR: In this paper, the applicability of asymptotically free QCD perturbation theory to the description of multi-jet hadronic final states and investigate its predictions for the process e + e − → hadrons both in the hadron “continuum” and in heavy Q Q resonances.

TL;DR: In this paper, it was shown that the number of elementary fermions (quarks and leptons) must be near the infrared stable point, and this allowed us to put bounds on the number and mass of the Higgs couplings.

TL;DR: In this paper, the Bianchi identities for gauge theories in an extended flat superspace are evaluated, and they permit better understanding of possible constraint equations, and can serve as a starting point for further constructions of gauge theories with extended supersymmetry.

TL;DR: In this paper, the rates of some important weak decay modes of F- and D-mesons are estimated and a simple decay mechanism for non-leptonic two-body decays is suggested.

TL;DR: In this article, an elastic Kπ partial-wave analysis is presented based on high statistics data for the reactions K±p → K±π+n and K ±p → k±π−Δ++ at 13 GeV obtained in a spectrometer experiment performed at SLAC.

TL;DR: In this paper, a series of SU(N) invariant non-linear σ models are constructed using exceptional orbits of the adjoint representation of SU. Each model possesses infinitely many local as well as non-local conserved charges.