Nuwe gasheerstowwe N,N’-bis(9-sikloheksyl-9-xantheniel)etileendiamien en N,N’-bis(9-sikloheksyl-9- tioxantheniel)etileendiamien: ’n Ondersoek na hul insluitingsvermoë

9 Particle Production in Au + Au Collisions at √ s NN = 9 . 2 GeV

In this report we present the first test run results from Au+Au collisions at √ sNN = 9.2 GeV at RHIC. The large acceptance STAR detector has collected 3k minimum bias collisions during this test run. The azimuthal anisotropy, identified particle spectra, particle ratios and HBT radii are observed to be consistent with the previous measurements from CERN SPS at similar center of mass energies. ...

ar X iv : n uc l - th / 9 90 10 97 v 1 2 9 Ja n 19 99 1 The Landau - Migdal Parameters , g ′ NN and g

Gauge - invariant formulation of NN → NN γ

H. Haberzettl1,* and K. Nakayama2,3,† 1Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA 2Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA 3Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jülich, Germany (Received 8 November 2010; revised manuscript r...

- th / 9 70 60 46 v 2 2 6 Ja n 19 98 THEORETICAL STUDY OF THE NN → NNππ REACTION

We have developed a model for the NN → NNππ reaction and evaluated cross sections for the different charged channels. The low energy part of those channels where the pions can be in an isospin zero state is dominated by N∗ excitation, driven by an isoscalar source recently found experimentally, followed by the decay N∗ → N(ππ)T=0 S−wave. At higher energies, and in channels where the pions are n...

O ct 1 99 9 Chiral 3 π - exchange NN - potentials : results for representation - invariant classes of diagrams N . Kaiser

We calculate in (two-loop) chiral perturbation theory the local NN-potentials generated by certain classes of three-pion exchange diagrams. We stress that the chiral 3πN N-contact vertex depends on the particular choice of the interpolating pion-field and therefore one has to consider representation invariant classes of diagrams by supplementing graphs involving the chiral 4π-vertex. We find th...