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Antiproton-proton annihilation into 0 has been studied with the Crystal Barrel spectrometer at CERN at an incident beam momentum of 1.94 GeV/c. The data were taken with a trigger requiring neutral nal states. A new isovector state, the a2(1660) decaying to 0 , is observed. In the invariant mass region around 2.1 GeV=c 2 , strong production of a heavy(More)
Received ; revised manuscript received We have studied pp annihilations at rest in liquid hydrogen into the nal state ! 0 where ! decays to 0. This reaction is dominated by the production of a 0 (980) and contributions from a 2 (1320) and b 0 1 (1235). Upper limits for the production of an axial vector h 0 1 (1380) meson and vector mesons !(1390), !(1600),(More)
Java and the Remote Method Invocation RMI mechanism supported by i t m a k e i t easy to build distributed applications and services in a heterogeneous environment. When the applications are interactive and require low response time, eecient implementations of RMI are needed. We explore both transport level protocols as well as object caching in the RMI(More)
Java and the Remote Method Invocation (RMI) mechanism supported by it make it easy to build distributed applications and services in a heterogeneous environment. When the applications are interactive and require low response time, eecient implementations of RMI are needed. We explore both transport level protocols as well as object caching in the RMI(More)
  • A Abele, B Adomeit, +78 authors C Zupan
  • 2007
The annihilation channels pp!! 0 , !, ! 0 were studied with the Crystal Barrel detector at LEAR at p-momenta of 600, 1200, and 1940 MeV=c. In most cases angular distributions were measured which allowed a complete J P-analysis using the helicity formalism. The contribution of all relevant initial states could be determined. The maximal contributing angular(More)
The reaction γp → pπ 0 η has been studied with the CBELSA detector at the tagged photon beam of the Bonn electron stretcher facility. The reaction shows contributions from ∆ + (1232)η, N (1535) + π 0 and pa0(980) as intermediate states. A partial wave analysis suggests that the reaction proceeds via formation of six for which pole positions and decay(More)
Single pi(0) photoproduction has been studied with the CB-ELSA experiment at Bonn using tagged photon energies between 0.3 and 3.0 GeV. The experimental setup covers a very large solid angle of approximately 98% of 4pi. Differential cross sections dsigma/dOmega have been measured. Complicated structures in the angular distributions indicate a variety of(More)
The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300 MeV, covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, and BnGa partial wave analyses. Strikingly large differences between data and(More)
The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma + A --> omega + X --> pi(0)gamma + X('). Results obtained for Nb are compared to a reference measurement on a(More)