Showing papers in "Nuclear Physics in 1980"

TL;DR: In this paper, a modification of the axion scheme which restores the natural P and T invariance of the theory cannot be ruled out experimentally and is based on the assumption that QCD resolves the U(1) problem, i.e., the mass of the singlet pseudoscalar meson does not vanish in the chiral limit.

TL;DR: In this paper, the authors developed a technique based explicitly on the factorization properties of mass singularities, which allows one to calculate the evolution of parton densities beyond leading order.

TL;DR: In this article, the authors take the view that gauge fields can be considered as chiral fields on a loop space, both in classical and in quantum theories, and derive the equations of motion governing the propagation of the infinitely thin rings formed by the lines of color-electric flux.

TL;DR: The behavior of the chiral order parameter in the confining phase of the Dirac equation has been analyzed in this paper, where it is shown that chiral symmetry is spontaneously broken.

TL;DR: In this paper, an effective lagrangian describing the low-energy spectrum and dynamics of the pseudoscalar nonet in the large N-colour limit of QCD was constructed.

TL;DR: In this article, a well-defined, reparametrization invariant expression for the next to leading term in the small ħ expansion of the euclidean loop Green functional ψ(C ) was derived.

TL;DR: In this article, the Gegenbauer polynomial x -space technique for evaluating dimensionally regularized massless Feynman diagrams is formulated and the analytical evaluation of counterterms in the minimal subtraction scheme at any model and for any composite operator is really possible.

TL;DR: In this paper, the authors apply the technique of dimensional reduction to both supersymmetric and non-supersymmetric theories, and show that in the latter case the technique is a viable alternative to conventional dimensional regularization.

TL;DR: In this paper, the authors formulate a general method of collective fields in quantum theory, which represents a direct generalization of the Bohm-Pines treatment of plasma oscillations, and provide a complete procedure for reformulating a given quantum system in terms of a most general (overcomplete) set of commuting operators.

TL;DR: In this article, for the n → m amplitude in the multi-Regge limit, the first corrections beyond the leading logarithmic approximation were obtained. But this was for the case where the mass of the vector particle is taken to zero, not only for the approximation of the present paper but also for higher order corrections.

TL;DR: In this paper, a class of models of dynamical weak-interaction symmetry breaking suggested by the work of Weinberg and Susskind is studied, and simple relations determine the alignment of weakly gauged subgroups and the masses of pseudo-Goldstone bosons.

TL;DR: In this paper, the Boltzmann equation is used to perform detailed calculations of the time development of such an excess in several simple illustrative models and Complications encountered in applications of the results to specific models are discussed.

TL;DR: In this paper, the phase factor P exp (e∳ C A μ d x μ ) = ψ(C ) for Yang-Mills theory was studied and the renormalizability of this phase factor was proved.

TL;DR: In this article, the authors discuss the various ways weak isospin breaking can be made compatible with MW = MZcosθw, and discuss how to make them compatible with each other.

TL;DR: In this article, the absolute differential cross sections for elastic electron-proton scattering have been measured in a four-momentum transfer range up to 1.4 fm −2.

TL;DR: In this article, the authors argue that the quantization of gravity with a cosmological constant, Λ, is both necessary and feasible (in the sense that the evaluation of the functional integral is no more difficult than when Λ= 0).

TL;DR: In this paper, the phase transition in 4D gauge theories coupled to scalar and spinor fields at finite temperature was studied. But the phase transitions were not investigated in terms of the Lagrangian of the zero frequency mode.

TL;DR: In this article, the authors consider a class of gauge theories in which chiral fermion fields are coupled to gauge fields, and they show that the breakdown appears to occur in a sequence of steps leading to a hierarchy of mass scales.

TL;DR: In this paper, a factorization theorem that represents all hard scattering processes as a power series in 1/Q^2 is presented. But it is based on the equations of motion, not on the common large momentum scale.

TL;DR: For field theories that include the abelian gauge field A μνϱ the field equations allow an arbitrary integration constant, which does not appear in the lagrangian but does affect the physics.

TL;DR: In this paper, an intrinsic state is defined, in terms of quadrupole shape variables, from which all eigenstates of the interacting boson model can be projected by appropriately averaging over these shape variables and the orientations of the intrinsic state.

TL;DR: In this paper, the authors derived an approach to nuclear vibrations in which only macroscopic densities and velocity fields appear, based on the TDHF equations and a schematic interaction of the Skyrme type.

TL;DR: In this article, a critical review of all the data produced at the ISR on proton-proton elastic scattering and total cross sections is presented, which is used to compute the impact parameter distribution of the inelastic overlap integral.

TL;DR: In this article, a modified jet evolution equation is proposed which resums large corrections to the usual leading logarithmic approximation when phase-space constraints expose the singular infrared structure of QCD.

TL;DR: In this article, the effective lagrangian for the U(1) problem is reanalysed on the basis of the color gauge invariance of the underlying QCD, and the decoupling mechanism of the axial-vector ghost from the physical sector is investigated with a particular gauge-fixing condition.

TL;DR: In this paper, the transformations of the Weyl and vector multiplet are purely superconformal covariantizations of the linearized rules, and the decomposition of Poincare supersymmetry in terms of super-formal transformation is exhibited for all submultiplets.

TL;DR: In this article, a mechanism for hadronic production of J/ψ associated with a gluon is discussed, which contributes a few percent to the measured production, and another example of the production of η c associated with η σ is presented.

TL;DR: In this paper, an energy-independent partial-wave analysis has been performed on pion-nucleon elastic and charge exchange differential cross sections and elastic polarizations, for lab. momenta below 500 MeV/c.

TL;DR: In this article, the authors consider the possibility that QCD-like theories can lead to massless or near-massless composite fermions, and they use the complementarity principle to analyze a theory as if the Higgs phenomenon occurred and then reinterpret the results in the language of composite gauge singlets.

TL;DR: In this paper, it was shown that clock models in two-dimensional statistical mechanics possess order and disorder variables φ n and χ m with n and m falling in the range 1,2, …, p.