Recent results of the analysis of ppBAR annihilation at rest in gaseous hydrogen both at NTP and at low pressure (5 mbar) are presented. For the first time, a strong contribution from P-wave annihilation is obtained by changing the pressure of the gas target. The results of the fit of the NTP sample agree with the expected total-annihilation branching ratios from the S-wave as well as with the ''ppi nuzzle''. The fit of the low-pressure sample shows the small contribution of the total S-wave annihilation. In this case, we do not observe the dominance of the triplet state. The coupled analysis of the two samples shows a better agreement with the experimental data when a structure is introduced at 1.56 GeV.
Recent Results of the Analysis of P(p)over-bar-]pi+pi-pi-0
BALESTRA, Ferruccio;BONAZZOLA, Giancarlo;BOTTA, Elena;BRESSANI, Tullio;BUSSA, Maria Pia;BUSSO, Luigi;COSTA, Sergio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;PANZIERI, Daniele;PIRAGINO, Guido;ZOSI, Gianfranco
1994-01-01
Abstract
Recent results of the analysis of ppBAR annihilation at rest in gaseous hydrogen both at NTP and at low pressure (5 mbar) are presented. For the first time, a strong contribution from P-wave annihilation is obtained by changing the pressure of the gas target. The results of the fit of the NTP sample agree with the expected total-annihilation branching ratios from the S-wave as well as with the ''ppi nuzzle''. The fit of the low-pressure sample shows the small contribution of the total S-wave annihilation. In this case, we do not observe the dominance of the triplet state. The coupled analysis of the two samples shows a better agreement with the experimental data when a structure is introduced at 1.56 GeV.
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