Figure 1: BAR Imaging Sequence. Each excitation pulse excites a particular shape within the field of view according to the pulse profile and the gradient strength. These n subdivisions of the image are then sequentially refocused in the same order they were excited so that each has identical T2 weighting. *n Enhanced Parallel Imaging Acceleration with a B1 Accelerated Reconstruction Sequence (B...

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We present results for the hybrid meson spectrum produced by gluonic excitations in full QCD using Wilson fermions. For the spin-exotic mesons with J P C = 1 −+ , 0 +− , and 2 +− we find the lightest state to be 1 −+ with a mass of 1.9(2) GeV. Results obtained for orbitally excited mesons are also presented.

The gap between ground and first excited state of the quantum-mechanical double well is calculated using the Renormalization Group equations to the second order in the derivative expansion, obtained within a class of proper time regulators. Agreement with the exact results is obtained both in the strong and weak coupling regime.

— Photoexcitation of the nucleon is studied in the framework of the constituent quark model with nonrelativistic quark-quark interactions. Utilizing the dominance of the pairwise structure of the relevant three-quark potential, the bound and excited state wave functions have been constructed using the Faddeevtype Integrodifferential Equation Approach. The method is based on the Hyperspherical H...

For a large class of finite-range quantum spin models with half-integer spins, we prove that uniqueness of the ground state implies the existence of a low-lying excited state. For systems of linear size L, of arbitrary finite dimension, we obtain an upper bound on the excitation energy (i.e., the gap above the ground state) of the form (C logL)/L. This result can be regarded as a multi-dimensio...

It is suggested that the quark-connning force is related by crossing symmetry to a color-singlet glueball G which is well described as a loop of one quantum of color magnetic ux. Electron pair annihilation as high as 2GeV above the mass could produce ! ` + ` ? accompanied by G or one of its excited states.

We obtain the exact Green function for excited-state geminate reversible dissociation with two different lifetimes and quenching in one dimension, in the absence of a potential of interaction. We consider the ground-state and irreversible reactions as special limits, and investigate the long time asymptotic behavior in comparison with that observed in three dimensions. © 1999 American Institute...