Showing papers in "Physics Letters B in 1998"

TL;DR: In this paper, a boundary of the anti-deSitter space analogous to a cut-off on the Liouville coordinate of the two-dimensional string theory is introduced to obtain certain Green's functions in 3+1-dimensional N = 4 supersymmetric Yang-Mills theory with a large number of colors via non-critical string theory.

TL;DR: In this paper, the authors propose a new framework for solving the hierarchy problem which does not rely on either supersymmetry or technicolor, and they take as the only fundamental short distance scale in nature.

TL;DR: In this article, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor, and this framework can be embedded in string theory.

TL;DR: In this article, the fermion determinant for a vector-like gauge theory with strictly massless quarks is represented on the lattice as det 1+V 2, where V=X(X † X) −1/2 and X is the Wilson-Dirac lattice operator with a negative mass term.

TL;DR: In this article, a variational procedure was used to study finite-density QCD in an approximation in which the interaction between quarks is modelled by that induced by instantons, and it was shown that uniform states with conventional chiral symmetry breaking have negative pressure with respect to empty space at all but the lowest densities.

TL;DR: One-loop correction to the integral kernel of the BFKL equation for the total cross section of the high energy scattering in QCD and the next-to-leading contribution to anomalous dimensions of twist-2 operators near j = 1 were obtained in this paper.

TL;DR: In this paper, it was shown that the Ginsparg-Wilson relation implies an exact symmetry of the fermion action, which may be regarded as a lattice form of an infinitesimal chiral rotation.

TL;DR: In this paper, the structure of infrared singularities in on-shell QCD amplitudes at two-loop order is discussed and a general factorization formula that controls all the ϵ-poles of the dimensionally regularized amplitudes is presented.

TL;DR: In this paper, the fermion determinant for strictly massless quarks can be written on the lattice as det D, where D is a certain finite square matrix explicitly constructed from lattice gauge fields.

TL;DR: In this paper, a power counting for the effective field theory describing nucleon-nucleon interactions is proposed. But the power counting is restricted to the 1 S 0 and 3 S 1 − 3 D 1 channels.

TL;DR: In this article, the effects of extra spacetime dimensions at intermediate mass scales, as expected in string theories with large-radius compactifications, were studied, focusing on the gauge and Yukawa couplings within the Minimal Supersymmetric Standard Model.

TL;DR: In this article, it was shown that large Q-balls can be copiously produced in the early universe, can survive until the present time, and can contribute to dark matter.

TL;DR: In this paper, the authors complete the calculation of the next-to-leading kernel of the BFKL equation by disentangling its energy-scale dependent part from the impact factor corrections in large-k dijet production.

TL;DR: In this article, a long-baseline reactor-neutrino vacuum-oscillation experiment (CHOOZ 1 ) was presented, where the neutrino detector was constructed in a tunnel protected from cosmic rays by a 300 MWE rock overburden.

TL;DR: The fixed point Dirac operator on the lattice has exact chiral zero modes on topologically non-trivial gauge field configurations independently whether these configurations are smooth, or coarse as discussed by the authors.

TL;DR: In this paper, the pion Bethe-Salpeter amplitude and the quark propagator in the chiral limit were derived and the axial-vector Ward-Takahashi identity was preserved.

TL;DR: In this paper, a new framework for solving the hierarchy problem was proposed which does not rely on low energy supersymmetry or technicolor, and the authors studied how the properties of black holes are altered in these theories.

TL;DR: In this paper, it was shown that if the solar and atmospheric data are both described by maximal vacuum oscillations at the relevant mass scales, then there exists a unique mixing matrix for three neutrino flavors.

TL;DR: In this paper, the authors present a definition of the cross section for the production of an isolated photon plus n jets which only depends upon direct photon production, and it is independent of the parton-to-photon fragmentation contribution.

TL;DR: In this article, the super-Kamiokande detector was used to detect atmospheric neutrino interactions with momentum p e > 100 MeV/c, p μ > 200 MeV /c, and with visible energy less than 1.33 GeV.

TL;DR: In this article, the effects of neutralino-stau ( χ− τ ) coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) χ in the minimal superymmetric extension of the Standard Model (MSSM), particularly in the constrained MSSM, were considered.

TL;DR: In this article, a massive spinor field in Euclidean anti-de Sitter space is considered and the boundary conditions of the field are parametrized by a spinor on the boundary, subject to a projection.

TL;DR: In this article, it was shown that Q-balls naturally exist in the Minimal Supersymmetric Standard Model (MSSM) with soft SUSY breaking terms of the minimal N = 1 SUGRA type.

TL;DR: For the case of n-jet production at next-to-next-toleading order in the QCD coupling, in the infrared divergent corners of phase space where particles are collinear or soft, one must evaluate (n+1)-parton final-state one-loop amplitudes through O (ϵ 2 ), where ϵ is the dimensional regularization parameter as discussed by the authors.

TL;DR: In this article, the largest uncertainties were identified and their effects on the solar neutrino fluxes were estimated using a systematic reevaluation of nuclear fusion rates and sound speeds.

TL;DR: In this article, the energy of a quark anti-quark pair in the large N limit of U(N) N=4 SYM in four dimensions at finite temperature was computed.

TL;DR: In this paper, it was shown that the long-distance sensitivity of order Λ QCD r introduced by the Fourier transform to coordinate space cancels to all orders in perturbation theory with long distance contributions to the heavy quark pole mass.

TL;DR: In this paper, the authors studied CP asymmetries in lepton-number violating two-body scattering processes and showed how they are related to CP asymmets in the decays of intermediate massive Majorana neutrinos.

TL;DR: In this paper, a simple N=1 five-dimensional model where the fifth dimension is compactified on the orbifold S 1 / Z 2 was presented, where non-chiral matter lives in the bulk of the five dimensions (five dimensions) while chiral matter is on the fixed points of the four-dimensional boundaries.

TL;DR: In this paper, the vertex corrections to the partial decay rate Γ(Z→b b ) involving the top quark are computed and the leading terms of order αα s in the 1/M t expansion are known.