The results of the analysis of a new data sample of (p) over bar annihilations at rest on deuterium and hydrogen, taken at the CERN LEAR by the OBELIX spectrometer, are presented. The (p) over bar d --> pi(-)p channel has been measured with a noticeable reduction of both the statistical and the systematic errors with respect to the previous OBELIX measurement and the branching ratio turns out to be (1.29 +/- +/- 0.07(stat) +/- 0.05(syst)).10(-5), in good agreement with the previous result. The (p) over bar d --> rho(-)p --> pi(-) pi(0)p channel has been investigated for the first time and the branching ratio is evaluated to be (2.9 +/- 0.4(stat) +/- 0.5(syst)).10(-5). Finally, as a check of the spectrometer absolute calibration, the (p) over bar p --> pi(+) pi(-) channel was also studied with a measured branching ratio of (4.27 +/- 0.15(stat) +/- 0.17(syst)).10(-3), in good agreement with the ASTERIX result.

A Study of Pontecorvo Reactions In Antiproton Deuterium Annihilations At Rest

BALESTRA, Ferruccio;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

Abstract

The results of the analysis of a new data sample of (p) over bar annihilations at rest on deuterium and hydrogen, taken at the CERN LEAR by the OBELIX spectrometer, are presented. The (p) over bar d --> pi(-)p channel has been measured with a noticeable reduction of both the statistical and the systematic errors with respect to the previous OBELIX measurement and the branching ratio turns out to be (1.29 +/- +/- 0.07(stat) +/- 0.05(syst)).10(-5), in good agreement with the previous result. The (p) over bar d --> rho(-)p --> pi(-) pi(0)p channel has been investigated for the first time and the branching ratio is evaluated to be (2.9 +/- 0.4(stat) +/- 0.5(syst)).10(-5). Finally, as a check of the spectrometer absolute calibration, the (p) over bar p --> pi(+) pi(-) channel was also studied with a measured branching ratio of (4.27 +/- 0.15(stat) +/- 0.17(syst)).10(-3), in good agreement with the ASTERIX result.
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V. G. ABLEEV;M. AGNELLO;A. ANDRIGHETTO;F. BALESTRA;G. BENDISCIOLI;A. BERTIN;E. BOTTA;T. BRESSANI;M. BRUSCHI;M. P. BUSSA;L. BUSSO;D. CALVO;C. CAVION;B. CEREDA;P. CERELLO;C. CICALO;M. CORRADINI;S. COSTA;I. DANTONE;S. DECASTRO;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. LANARO;E. L. RIZZINI;V. LUCHERINI;A. MAGGIORA;S. MARCELLO;U. MARCONI;G. MARON;A. MASONI;B. MINETTI;P. MONTAGNA;M. MORANDO;F. NICHITIU;D. PANZIERI;G. PAULI;M. PICCININI;G. PIRAGINO;M. POLI;G. PUDDU;R. A. RICCI;E. ROSSETTO;A. ROTONDI;A. M. ROZHDESTVENSKY;A. SAINO;P. SALVINI;L. SANTI;M. G. SAPOZHNIKOV;N. S. CESARI;S. SERCI;R. SPIGHI;P. TEMNIKOV;S. TESSARO;F. TOSELLO;V. I. TRETYAK;G. USAI;S. VECCHI;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/2318/107607
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