The high-intensity hyperon beam at CERN

A high-intensity hyperon beam was constructed at CERN to deliver Sigma- to experiment WA89 at the Omega facility and operated from 1989 to 1994. The setup allowed rapid changeover between hyperon and conventional hadron beam configurations. The beam provided a Sigma-flux of 1.4 x 10^5 per burst at mean momenta between 330 and 345 Gev/c, produced by about 3 x 10^10 protons of 450 GeV/c . At the experiment target the beam had a Sigma-/pi- ratio close to 0.4 and a size of 1.6 x 3.7 cm^2. The beam particle trajectories and their momenta were measured with a scintillating fibre hodoscope in the beam channel and a silicon microstrip detector at the exit of the channel. A fast transition radiation detector was used to identify the pion component of the beam.Comment: 20 pages, 13 figures. Submitted to Nucl. Instr. Meth.

Charge Asymmetries for D, D_s and Lambda_c Production in Sigma- - Nucleus Interactions at 340 GeV/c

CERN experiment WA89 has studied charmed particles produced by a Sigma^- beam at 340 GeV/c on nuclear targets. Production of particles which have light quarks in common with the beam is compared to production of those which do not. Considerable production asymmetries between D^- and D^p, D_s^ and D_s^+ and Lambda_c and Antilambda_c are observed. The results are compared with pion beam data and with theoretical calculations.Comment: LaTeX ; 16 pages including 4 ps figure

CERN-SPS-Hyperonen. Hyperonstrahl-Experiment Schlussbericht

SIGLEAvailable from TIB Hannover: DtF QN1(37,2) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Neutron decay, semileptonic hyperon decay and the Cabibbo model

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Is the U(3100) strange diquonium?

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Ab initio calculations on various sialic acids provide valuable information about sialic acid-specific enzymes

This study presents ab initio calculations on six sialic acid derivatives (N-acetylneuraminic acid, 2-deoxy-2,3-didehydro-N-acetylneuraminic acid, N-acetyl-4-O-acetylneuraminic acid, N-glycolylneuraminic acid, N-glycolyl-4-O-acetylneuraminic acid and N-acetyl-9-O-acetylneuraminic acid). The calculations were carried out using the GAMESS-UK-Program. Since the charge distribution of a ligand has an essential impact on the specific interaction with an enzyme or a receptor, the precise results of ab initio calculations lead to significant information concerning possible roles of the different functional groups occurring on sialic acids. In correlation to this, valuable conclusions about the activities of different sialic acid-specific enzymes, such as sialidases, trans-sialidases, lyases and O-acetyl- or O-methyltransferases can be drawn, since these activities strongly depend on the presence or absence of the various functional groups