Summary
Approximately 3500 four-prong events, observed in the Saclay 81 cm LHBC exposed at the CERN PS to a beam of 2.75 GeV/c π− mesons, have been analysed; the cross-sections for the different multipion channels have been determined. 1324 events correspond to the reaction π−+p→π−+p+π−+π+ which is characterized by an important production of theN *++33 isobar (σ=0.61 mb) and of the ρ0 resonance (σ=0.36 mb). TheN *++33 isobar appears to be mainly produced according to an OPE mechanism. The σππ elastic cross-section in a pureT=2 state is evaluated as a function of the dipion energy; scattering angular distributions for different (π−π−) mass intervals are also analysed.
Riassunto
Si sono osservati circa 3500 eventi a quattro rami su film della camera a bolle di 81 cm di Saclay esposta ad un fascio di π− da 2.75 GeV/c di impulso del P.S. del CERN. L’analisi di questi eventi ha permesso di determinare le sezioni d’urto dei processi con produzione multipla di mesoni π. 1324 eventi corrispondono alla reazione π−+p→ →π−+π−+π++p che è caratterizzata da un forte contributo dell’isobaroN *++33 (σ=0.61 mb) e della risonanza ρ0 (σ=0.36 mb). La produzione dell’isobaroN *++33 sembra essere in accordo col modello OPE. Si è calcolata la sezione d’urto σππ nel puro statoT=2 in funzione dell’energia del dipione e si sono analizzate le distribuzioni angolari per differenti energie del sistema (π−π−).
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Saclay-Orsay-Bari-Bologna Collaboration., Alitti, J., Baton, J.P. et al. Study of the reaction π−p→N *++33 π− − and ππ elastic scatteringand ππ elastic scattering. Nuovo Cim 35, 1–12 (1965). https://doi.org/10.1007/BF02734820
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DOI: https://doi.org/10.1007/BF02734820