Data di Pubblicazione:
1991
Abstract:
The pBARp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at pBAR energies (almost-equal-to 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, beta-sigma-an(T) = 33.2 +/- 1.7 (stat.) +/- 1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
antiproton proton annihilation; cross sections; OBELIX; PS201
Elenco autori:
M. AGNELLO;F. BALESTRA;G. BELLI;G. BENDISCIOLI;A. BERTIN;P. BOCCACCIO;G. C. BONAZZOLA;T. BRESSANI;M. BRUSCHI;M. P. BUSSA;L. BUSSO;D. CALVO;M. CAPPONI;M. CORRADINI;S. COSTA;S. DECASTRO;D. DISEP;I. V. FALOMKIN;L. FAVA;A. FELICIELLO;L. FERRERO;V. FILIPPINI;R. GARFAGNINI;U. GASTALDI;P. GIANOTTI;A. GRASSO;C. GUARALDO;F. IAZZI;A. LANARO;E. L. RIZZINI;M. LOMBARDI;M. P. MACCIOTTA;A. MAGGIORA;S. MARCELLO;U. MARCONI;G. V. MARGAGLIOTTI;G. MARON;M. MASALA;A. MASONI;I. MASSA;B. MINETTI;M. MORANDO;M. MORGANTI;D. PANZIERI;G. PAULI;M. PICCININI;R. PIRAGINO;M. POLI;G. B. PONTECORVO;G. PUDDU;R. A. RICCI;A. ROTONDI;A. M. ROZHDESTVENSKY;P. SALVINI;L. SANTI;M. G. SAPOZHNIKOV;G. SARTORI;N. SEMPRINICESARI;S. SERCI;F. TOSELLO;V. I. TRETYAK;L. VANNUCCI;G. VEDOVATO;L. VENTURELLI;A. VITALE;A. ZENONI;A. ZOCCOLI;G. ZOSI
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