After presenting a survey of theoretical results concerning the structure of two-dimensional QCD, we present a numerical study related to the mass eigenstates and the decay amplitudes of higher mesonic states. We discuss in detail the fate of important dynamical points such as stability of the spectrum and the problem of screening versus confinement in this context. We point out differences in ...

s Editor: Askiel Bruno Assisted by: Engin Y. Yilmaz

It is shown that the experimental data of ψ and ψ are consistent with a −90◦ phase between the strong and eletromagnetic decay amplitudes. The ee → ρπ measured at ψ is also consistent with the branching ratio predicted by Rosner’s scenario on ρπ puzzle in charmonium physics. This scenario leads to a possible large charmless branching ratio in ψ decays. work in collaboration with C. Z. Yuan and ...

The end-point contributions in the quark longitudinal momentum fraction of the virtual photon (γ) to vector meson (V ) impact factor to the diffractive electroproduction amplitude can be factorized in terms of a generalized parton evolution of the target parton distribution. The result is used to model the helicity amplitudes γp → V p in terms of small x generalized parton distributions. e-mail...

1 Institute for Theoretical Particle Physics, KIT, Karlsruhe, Germany Institute for Advanced Study, Princeton, NJ 08540, USA, USA Scientific Research Computing Center, Moscow State University, 119991 Moscow, Russia 4 Skobeltsyn Institute of Nuclear Physics of Moscow State University, 119991 Moscow, Russia Knowledge of two-loop QCD amplitudes for processes qq̄ → V1V2 → (l1 l̄ 1)(l2 l̄ 2) is importa...

In this paper the general form of scattering amplitudes for massless particles with equal spins s (ss → ss) or unequal spins (sasb → sasb) are derived. The imposed conditions are that the amplitudes should have the lowest possible dimension, have propagators of dimension m−2, and obey gauge invariance. It is shown that the number of momenta required for amplitudes involving particles with s > 2...

By use of current experimental data, we carry out an isospin analysis of the weak decays B → Dπ, D * π and Dρ. It is found that only in B → Dρ the strong phase shift of two different isospin amplitudes can be approximately neglected. We derive some useful relations between the CP-violating measurables and the weak and strong transition phases, and illustrate the different effects of final-state...

We initiate a program to study the relationship between the target space, the spectrum and the scattering amplitudes in string theory. We consider scattering amplitudes following from string theory and quantum field theory on a curved target space, which is taken to be the SU(2) group manifold, with special attention given to the duality between contributions from different channels. We give a ...

objective(s) bupropion is an atypical antidepressant that is widely used in smoke cessation under fda approval. the study of synaptic effects of bupropion can help to finding out its mechanism(s) for stopping nicotine dependence. in this study the effects of perinatal bupropion on the population spike (ps) amplitude of neonates were investigated. materials and methods hippocampal slices were pr...

In many signal processing applications, an appropriate measure to compare two signals plays a fundamental role in both implementing the algorithm and evaluating its performance. Several techniques have been introduced in literature as similarity measures. However, the existing measures are often either impractical for some applications or they have unsatisfactory results in some other applicati...