Showing papers in "Physics Letters B in 1989"

TL;DR: In this paper, it was shown that if the energy is not so extreme to cause a gravitational instability and when the scattering angle approaches some critical value from below, the distance starts increasing, thus departing from the usual position-momentum uncertainty relation, and in no instance is the resolution smaller than the string length.

TL;DR: In this paper, the authors exploit these static quark symmetries to derive model-independent normalizations of some weak hadronic matrix elements involving heavy quarks, as well as many relationships between such matrix elements.

TL;DR: In this paper, the structure of the effective couplings induced by vector and axial-vector exchange is model independent, provided consistency with QCD asymptotic behaviour is incorporated.

TL;DR: In this paper, the authors conjecture that all rational field theories are classified by groups via (2+1)-dimensional Chern-Simons gauge theories, and that all known rational conformal field theories may be obtained from (2 + 1) dimensional ChernSimons theories by appropriate choice of gauge group.

TL;DR: In this article, the dynamics of the standard gravitational action without a cosmological constant were analyzed from the point of view of constrained hamiltonian systems, and it was observed that contrary to what one might think, the theory is fully covariant and contains only one overall degree of freedom (the cosmologically constant) in addition to the two degrees of freedom per point of ordinary Einstein's theory.

TL;DR: In this article, the authors discuss twisting of open strings and corresponding Z2 (target space) orbifold solutions for the SO(8192) model and SO(32) superstring.

TL;DR: The authors showed that the study of catastrophes is a powerful tool in the classification of conformal theories, and applied it to N = 2 superconformal models, including the minimal superconsformal model.

TL;DR: In this paper, a high statistics study of the proton structure functions F 2 ( x, Q 2 ) and R = σ L / σ T measured in deep inelastic scattering of muons on a hydrogen target is presented.

TL;DR: In this paper, a refined version of the flipped,SU(5)×U(1) string model with the following properties is presented: the complete massless spectrum is derived and shown to be free of all gauge and mixed anomalies apart from a single anomalous U(1).

TL;DR: The ADE classification of modular invariants arises as the classification of projective descriptions of P 1; in general, the hierarchy of fixed points is conjectured to be isomorphic to classification of quasihomogeneous singularities.

TL;DR: In this paper, a new class of models with dynamical electroweak symmetry breaking is proposed, where the composite operator ψ ψ has a large anomalous dimension γm≅2 and the t quark plays an important role in the generation of W and Z boson masses.

TL;DR: In this paper, the authors studied the moduli space of open string models and showed that the duality between large and small compactification radius extends also to open string theories, using this, the Chan-Paton factors of a circle-compactified model are partly explained as coming from the set of space-time fixed points of a dual orbifold.

TL;DR: In this article, a simple extension of the standard theory where neutrinos decay dominantly into invisible modes involving a majoron associated with the spontaneous violation of B -L symmetry due to physics at or below the electroweak scale is presented.

TL;DR: In this article, the critical exponents for the two-dimensional potential φ2n were calculated using the ϵ expansion and it was found that the results at lowest perturbative order are not in agreement with what would be expected from the proposed correspondence between such Landau-Ginsburg hamiltonians and minimal conformal field theories.

TL;DR: The representation theory of the q-deformation of SU(2) provides solutions to the polynomial equations of Moore and Seiberg for rational conformal field theories whenever q is a root of unity.

TL;DR: In this paper, the antineutrino spectrum of fission products from thermal neutron induced fission of 241Pu was derived from a measurement of the correlated beta spectrum.

TL;DR: In this article, a topological gauge theory of gravity in five dimensions is presented, based on the Chern-Simons five-form and the SO(1, 5) gauge group.

TL;DR: In this paper, duality invariance of the supergravity action restricts the Kahler potential and the superpotential and connects them to the theory of modular forms, which has relevance in string-induced supergravity for those scalar fields which are moduli of the underlying string compactification.

TL;DR: In this article, spontaneous symmetry breaking of global supersymmetry for a single scalar superfield in an arbitrary Kahler manifold is discussed, where the curvature of the manifold goes to infinity (or equivalently the masses of the scalar partners of the goldstino go to infinity).

TL;DR: In this article, it is shown that the Schwarzchild metric inside a black hole can be attached to the de Sitter one at some spacelike junction surface which may represent a short transition layer.

TL;DR: In this article, the authors estimate that a fraction of order (Gμ 2x−4 ) of loops will form black holes, where x = L / s, and s is the correlation length of the string.

TL;DR: In this article, the authors introduced infinite-dimensional algebras of the Virasoro/Kac-Moody/Floratos-Iliopoulos type, which involve trigonometric functions in their structure constants.

TL;DR: In this paper, a path integral formulation of G/H conformal theories is presented, based on gauged Wess-Zumino-Witten actions, and the conformal charge of the model is c=cG−cH, exactly as in the GKO construction.

TL;DR: In this article, a search for light Higgs bosons has been performed in an electron beam-dump experiment and no positive signal is observed which allows us to reject at 90% CL the existence of a standard Higgs in the range from 1.2 to 52 MeV.

TL;DR: In this article, the holonomy along lines parallel to the time-axis is computed for one-and two-baryon physics, which are good approximations to the SKYME field configurations.

TL;DR: A characterization of the coset spaces on which N = 2 superconformal models can be constructed by the use of the super Kac-Moody algebra is given in this article.

TL;DR: In this paper, it was shown that when a relevant perturbation by the (1, 3) operator is applied on the Virasoro minimal models with the central charge c= 1−6 m(m+1), perturbed systems are effectively described by the sine-Gordon equation ∂ z ∂ φ =γ sin βφ, β=[ 2m (m + 1)] 1 2, in the lowest order of perturbations theory.

TL;DR: In this paper, the authors extended the study of superheavy nuclei to include deformed nuclei and found that in addition to the traditional spherical nuclei, also deformed super heavy nuclei with half-lives long enough for their detection, are expected to exist.

TL;DR: In this paper, the action of the target space modular group restricts the parameters of the low-energy effective action of orbifold compactifications, and these constraints are shown to be consistent with explicit computations of string S-matrix elements.

TL;DR: In this article, the Yang-Lee edge singularity was analyzed and it was shown that additional conserved currents exist which imply the factorization of the S -matrix, whose form is explicitly derived.