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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.
1994
PHYSICS OF ATOMIC NUCLEI
57
1614
1618
N. S. CESARI;V. G. ABLEEV;A. ADAMO;A. ANDRIGHETTO;M. AGNELLO;F. BALESTRA;G. BELLI;G. BENDISCIOLI;A. BERTIN;P. BOCCACCIO;G. BONAZZOLA;E. BOTTA;T. BRESSANI;M. BRUSCHI;M. P. BUSSA;L. BUSSO;D. CALVO;M. CAPPONI;B. CEREDA;P. CERELLO;C. CICALO;M. CORRADINI;S. COSTA;I. DANTONE;S. DECASTRO;C. DELEO;D. Y. DENISOV;F. DISEP;A. DONZELLA;L. FAVA;A. FELICIELLO;L. FERRERO;A. FILIPPI;V. FILIPPINI;A. FONTANA;D. GALLI;R. GARFAGNINI;U. GASTALDI;B. GIACOBBE;P. GIANOTTI;A. GRASSO;C. GUARALDO;F. IAZZI;A. LAI;A. LANARO;E. L. RIZZINI;M. LOMBARDI;V. LUCHERINI;A. MAGGIORA;S. MARCELLO;U. MARCONI;G. V. MARGAGLIOTTI;G. MARON;A. MASONI;I. MASSA;B. MINETTI;P. MONTAGNA;M. MORANDO;L. MUSA;F. NICHITIU;D. PANZIERI;G. PAULI;M. PICCININI;G. PIRAGINO;M. POLI;S. N. PRAKHOV;G. PUDDU;R. A. RICCI;E. ROSSETTO;A. ROTONDI;A. M. ROZHDESTVENSKY;A. SAINO;P. SALVINI;L. SANTI;M. G. SAPOZHNIKOV;S. SERCI;R. SPIGHI;P. TEMNIKOV;S. TESSARO;F. TOSELLO;V. I. TRETYAK;G. USAI;L. VANNUCCI;S. VECCHI;G. VEDOVATO;L. VENTURELLI;M. VILLA;A. VITALE;A. ZENONI;A. ZOCCOLI;G. ZOSI
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/107302
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