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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)
  • 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 amount of damage resulting from pulmonary aspiration of gastric contents is determined primarily by the acidity of the aspirate. Thus, it has been recommended that the pH of stomach contents of pregnant women be increased by the oral administration of antacids prior to anesthesia for delivery. This study was done to investigate the effects of antacid(More)
The 0 momentum dependence of the decay ! + ? 0 has been measured with the Crystal Barrel detector. The analysis is based on 3230 events. The results of this independent measurement are compared to new chiral perturbation theory calculations and previous measurements. The calculation of the amplitude of the decay into three pions has been a longstanding(More)
  • A Abele, J Adomeit, +63 authors L The
  • 2007
The annihilation channel pp!K + K ? 0 in liquid hydrogen at rest has been studied with the Crystal Barrel detector at LEAR. The measured branching ratio is: BR(pp!K + K ? 0) = (2:37 0:15)10 ?3. A partial wave analysis shows that this reaction is dominated by the (K K) S , KK (892) and (1020) intermediate states. Weak signals are observed for a 2 (1320), f 2(More)
The distribution of m(+ ?) in the decay 0 ! + ? has been measured with the Crystal Barrel detector. The results are based on a total of 7392 observed 0 decays. The box anomaly constant is extracted from this and its value is found to agree well with theoretical expectations. The pseudoscalar nonet parameters (f 1 , f 8 and PS) are determined. Finally, we nd(More)
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