On the Spiral Patterns in Disk Galaxies

Spiral patterns in disk galaxie

Nonuniversal Effects in the Homogeneous Bose Gas

Effective field theory predicts that the leading nonuniversal effects in the homogeneous Bose gas arise from the effective range for S-wave scattering and from an effective three-body contact interaction. We calculate the leading nonuniversal contributions to the energy density and condensate fraction and compare the predictions with results from diffusion Monte Carlo calculations by Giorgini, Boronat, and Casulleras. We give a crude determination of the strength of the three-body contact interaction for various model potentials. Accurate determinations could be obtained from diffusion Monte Carlo calculations of the energy density with higher statistics.Comment: 24 pages, RevTex, 5 ps figures, included with epsf.te

Effective hadronic Lagrangian for charm mesons

An effective hadronic Lagrangian including the charm mesons is introduced to study their interactions in hadronic matter. Using coupling constants that are determined either empirically or by the SU(4) symmetry, we have evaluated the absorption cross sections of $J/\psi$ and the scattering cross sections of $D$ and $D^*$ by $\pi$ and $\rho$ mesons.Comment: 5 pages, 4 eps figures, presented at Strangeness 2000, Berkeley. Uses iopart.cl

Baryon Pair, rho0 rho0 Pair and Inclusive Hadron Production in Two-Photon Collisions at LEP

The most recent results of inclusive hadron, baryon pair and rho0 rho0 productions in two-photon collisions measured at LEP are presented.Comment: Talk presented at the XXXVIIIth Rencontre de Moriond (QCD), Les Arcs, March 200

Silicon contact for area reduction of integrated circuits

Silicon contact for area reduction of integrated circuit