Showing papers by "National Nuclear Energy Commission published in 1972"
TL;DR: In this article, a conformally covariant expansion of the four-point function is solved both in Minkowski and in Euclidean space, and the role of shadow singularities is discussed.
263 citations
234 citations
TL;DR: In this paper, a model of scale invariance for both deep inelastic scattering and e + e − annihilation incorporating an infinite number of vector mesons is proposed, and structure functions are calculated explicitly in good agreement with experiments.
142 citations
TL;DR: In this paper, an identity for the three-point correlation function is derived from conformal symmetry, which allows to derive an integral representation for any irreducible conformal graph.
112 citations
79 citations
TL;DR: In this article, the conformal algebra on space-time to the orthogonal O(4,2) algebra is exploited to derive in a manifestly covariant way an operator-product expansion on the light cone in terms of irreducible operator representations.
Abstract: The isomorphism of the conformal algebra on space-time to the orthogonal O(4,2) algebra is exploited to derive in a manifestly covariant way an operator-product expansion on the light cone in terms of irreducible operator representations of the conformal algebra. The expansion provides for a solution of the causality problem for operator expansion on the light cone. Additional properties of the conformally covariant expansion, as well as its relation to the conformally invariant three-point function, are discussed.
69 citations
68 citations
TL;DR: Asymptotic conformal invariance is proved to be true at all orders in perturbation theory as discussed by the authors, and the correct Ward Identities for broken conformality are derived: they are the extension of the Callan Symanzik equation from scale to conformal transformations.
65 citations
TL;DR: In this paper, the conformal covariance of the operator product expansion in the Thirring model is verified, but the vacuum state is invariant only under the O2,2 subalgebra of the infinite conformal algebra.
Abstract: The-infinitesimal generators of the infinite-dimensional conformal algebra in two space-time dimensions are constructed from the stress tensor. The conformal covariance of the operator product expansion in the Thirring model is verified, but the vacuum state is found to be invariant only under theO2,2 subalgebra of the infinite conformal algebra.
59 citations
TL;DR: In this article, it was shown that strictly conformal invariant skeleton theory is compatible with the observed scaling only if it possesses an infinite number of local tensors of spin n = 2, 4, and scale dimension ln = 2+n, which are all conserved.
54 citations
TL;DR: In this paper, the cross sections for the reactions e + + e − → 2 π ± + nπ o (1 ⩽ n⩽ 4) and e + − → (4 π − ± nπ ± ) (0 ⩲ n ⩾ 2) have been measured assuming that the produced particles are only pions with a pure phase space momentum distribution.
TL;DR: The average multiplicities of charged plus neutral pions produced in e + e − collisions have been determined for total center-of-mass energies ranging from 1.2 to 2.4 GeV as discussed by the authors.
TL;DR: In this article, the rare earth abundances of the Campania volcanic suite are discussed in terms of the models proposed by several authors for the evolution of the single volcanoes and the origin of the potash-rich magmas and the available data fit well a model involving high pressure partial melting of a continental crust in which a liquid in equilibrium with a pyroxene-garnet solid assemblage is formed.
TL;DR: In this article, the hadronic contribution to the muon anomalous magnetic moment is calculated using recent results from colliding beam experiments; a value of (68 ± 9) × 10 −9 is obtained.
TL;DR: In this paper, an intuitive picture for understanding scaling in hadronic as well as non hadronic processes is proposed which makes use of shrinkage of the size of the particle with its mass.
TL;DR: Differential cross sections for single photoproduction of neutral pion on neutron have been measured at different c.m. angles for photon energies, between 450-800 MeV as discussed by the authors.
TL;DR: In this paper, the radial and time dependence of the isophote diagrams for the Cerenkov light in (1011÷l012) eV E.S.A.
Abstract: We have calculated with a Monte Carlo method the radial and time dependence of the isophote diagrams for the Cerenkov light in (1011÷l012) eV E.A.S. A possible explanation for the Cerenkov pulse structure (rise time and width) observed with fast techniques is given.
TL;DR: In this article, critical indices for the spherical model are computed in arbitrary dimension space and exact results are recovered in three-dimensional space, using conformal covariant self consistency conditions.
TL;DR: In this article, conformal symmetry for the operator product of the hadronic electromagnetic current and the pion interpolating field, at light-like distances, was used to connect the behaviour of the structure function in the scaling limit to the on-mass-shell asymptotic behaviour of electromagnetic pion form factor.
Abstract: Using conformal symmetry for the operator product of the hadronic electromagnetic current and the pion interpolating field, at lightlike distances, we connect the behaviour of the structure function in the scaling limit to the on-mass-shell asymptotic behaviour of the electromagnetic pion form factor. Our results are based on the analysis of the dimension spectrum of local operators appearing in the operator product expansion and on the assumption of precocious scaling. As an application of our results, predictions on the asymptotic behaviour of the e.m. pion form factor as well as for the threshold behaviour of the structure function for the singly inclusive π production in e+e− annihilation, are given.
TL;DR: In this article, the Importance Conservation Principle was used to restrict the perturbation methods in nuclear Reactors from the importance conservation principle, and the authors proposed a method to prevent the implosion of a nuclear Reactor.
Abstract: (1969). Perturbation Methods in Nuclear Reactors from the Importance Conservation Principle. Nuclear Science and Engineering: Vol. 35, No. 1, pp. 141-144.
TL;DR: In this article, the mean free path of phonons was calculated directly from the thermal diffusivity of various materials using the flash technique, and the data were fitted to a 1/T law.
TL;DR: The experimental apparatus exposed to the positive pion beam of the LEALE Laboratory of Frascati is described in this paper, which consists in a diffusion cloud chamber filled with helium at the pressure of 15 atm.
TL;DR: Results show that irradiation of both gametophytes, which gives the highest frequency of mutations without chimerism, is a very simple method and a valid tool for breeding.
TL;DR: In this paper, a monitoring system for the LNF-LEALE positive and negative medium energy pion beams is described based upon the integral measurement of the beam charge, in analogy with Faraday-cup methods used for electron beams.