Showing papers in "Nuclear Physics in 1991"

TL;DR: In this article, the relation between the order parameter in the fractional quantum Hall effect and the chiral algebra in rational conformal field theory is stressed, and new order parameters for several states are given.

TL;DR: In this paper, the prepotentials and geometry of the moduli spaces for a Calabi-Yau manifold and its mirror were derived and all the sigma model corrections to the Yukawa couplings and moduli space metric were obtained.

TL;DR: An exact relativistic single-integral formula for the thermal average of the annihilation cross section times velocity, the key quantity in the determination of the cosmic relic abundance of a species, is obtained in this paper.

TL;DR: In this article, it was shown that low-energy string theory admits a variety of solutions with the structure of an extended object surrounded by an event horizon, whose extremal member is a previously discovered non-singular supersymmetric fivebrane.

TL;DR: In this paper, an equation of state for hot, dense matter is presented in a form that is sufficiently rapid to use directly in hydrodynamical simulations, for example, in stellar collapse calculations.

TL;DR: In this paper, Weinberg et al. used the chiral invariant effective lagrangians to study the leading terms in powers of momenta in the S-matrix for a process involving arbitrary numbers of low-momentum pions and nucleons.

TL;DR: In this paper, the energy spectrum of a system of two particles enclosed in a box with periodic boundary conditions is determined by the scattering phases at these energies, and exact exact formulae are derived which can be used to compute the energy levels given the scattering phase.

TL;DR: In this paper, a form of high-energy factorization is proposed to find the small-x behaviour of heavy mass production in QCD, which is k ⊥ -dependent and provides all leading ln x corrections to the coefficient function in various kinds of single-k and double-k processes.

TL;DR: In this article, the exact functional dependence of Δa(U) on any untwisted modulus field U of an orbifold vacuum was derived, where Aa is easily computable rational constants.

TL;DR: In this article, the O(αs3) radiative corrections to Higgs boson production in hadronic colliders in the infinite top-quark mass limit were calculated.

TL;DR: In this article, the authors presented the complete calculation of the order α s 2 correction in the MS scheme to the Drell-Yan K-factor, and showed that the O(α s 2) part of the Kfactor is dominated by the qq, qg, gg and qq subprocesses.

TL;DR: In this article, the correlation functions in minimal topological field theories were calculated using the Landau-Ginzburg superpotential and the KdV differential operator, and it was shown that the minimal topology models are in perfect agreement with the matrix models as solved in terms of the kdV hierarchy.

TL;DR: In this paper, the authors show how the ordinary fermions can be partially composite, where the constituents participate in SU(2) × U(1) breaking, assuming no exotic strong interaction dynamics since the force binding the constituents is entirely QCD-like.

TL;DR: In this paper, a modification of the normal Lipatov equation was introduced to allow a factorization between the short-distance and long-distance physics, and numerical results were provided using the cross section for b-quark production as an example.

TL;DR: In this article, the ground state metric of N = 2 supersymmetric ground states is shown to be pseudo-topological and can be viewed as a result of the fusion of the topological version of n = 2 theory with its conjugate.

TL;DR: In this paper, instantons and soliton solutions of heterotic string theory are investigated with an emphasis on the worldsheet point of view, where instantons have the structure of a fivebrane in ten dimensions, the solitons are simply related to the instantons by Wick rotation.

TL;DR: The local geometry of the parameter space of Calabi-Yau manifolds has been studied in this paper, where it is shown that the parameters of the complex structure decompose into a product with the space of parameters as one factor and a complex extension of the Kahler class as the other.

TL;DR: In this paper, the authors derived the loop equation for two-dimensional gravity from the KdV equations and the string equation of the one-matrix model and showed that it is equivalent to a set of linear constraints on the square root of the partition function satisfying the Virasoro algebra.

TL;DR: In this paper, the authors performed a complete computation of the contributions to b → s + γ, B → s / + / −, b → S ν ν, b→ s ν + g, b d o − B d o, B s o − b s o−B s o, and B n − B n o − N = 1 supergravity with radiative breaking of the electroweak symmetry group.

TL;DR: In this article, a compilation of energy levels of A = 13, 14 and 15 nuclei, with emphasis on material leading to information about the structure of the A = 14, 15 and 16 systems is presented.

TL;DR: In this article, a closed string theory based on the "doubled" set of string coordinates (x = x + + x−, x = x+ − x−) is discussed, which is manifestly invariant under the duality transformations.

TL;DR: In this paper, the authors define the string space-time symmetries C,P,T and their products using string field theory and incorporate the effects of nonlocal interactions and the infinite number of particle fields.

TL;DR: Using the QCD coherent branching algorithm, the authors compute the Deep Inelastic Scattering and Drell-Yan hard cross sections in the semi-inclusive region of large χ and compare the results with known analytical expressions to the same accuracy in the MS subtraction scheme.

TL;DR: In this paper, the role played by conventional Wilson lines in Chan-Paton symmetry breaking is discussed, and the presence of an extended symmetry algebra allows, in general, a number of choices for the behavior of massive states under twist.

TL;DR: In this article, the space-time dynamics of fivebrane solitons in heterotic and type II string theories are described in terms of supersymmetric low-energy field theories which live on the (5+1)-dimensional soliton worldbranes.

TL;DR: In this paper, the geometrical aspects of the vacua and their relation to twistor space, W∞, harmonic superspace and the superstring world-sheet are discussed.

TL;DR: In this article, the running coupling g 2 in lattice gauge theories and non-linear σ-models through a finite-size scaling analysis is computed, at energies up to about 30 times the mass of the particles in the theory.

TL;DR: In this article, a new type of non-trivial fixed point is known to occur when k > 2s and the specific heat and magnetization are determined by the leading irrelevant operator and the corresponding critical exponents are obtained exactly.

TL;DR: In this paper, the authors investigated the QCD corrections to the cross section and single-particle inclusive differential distributions for p + p → Q(Q) + X where Q and Q are heavy quarks.

TL;DR: In this article, a local renormalisation group equation which realises infinitesimal Weyl rescalings of the metric and which is an extension of the usual Callan-Symanzik equation is described.