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Observation of quasi two-body production in pion minus proton goes to neutron plus four charged pions at 8 GeV/c

Thesis/Dissertation ·
OSTI ID:5420306
This thesis reports the first observation of quasi 2-body production in the backward reaction ..pi../sup -/p ..-->.. n..pi../sup +/..pi../sup +/..pi../sup -/..pi../sup -/. Data were obtained using an 8 GeV/c pion beam incident on a liquid hydrogen target inside the University of Illinois/Argonne National Laboratory streamer chamber. The chamber was triggered by the interaction of a fast, forward neutral hadron in thick plate optical spark chambers. Total backward cross sections are derived for the processes ..pi../sup -/p ..-->.. N/sup *//sup 0/ (1520) + rho/sup 0//f/sup 0/, N/sup *//sup 0/ (1670) + rho/sup 0//f/sup 0/, ..delta../sup 0/ (1890) + rho/sup 0//f/sup 0/, and ..delta../sup -/ (1236) + A/sub 2//sup +/. Evidence for a narrow A/sub 1//sup +/ resonance is not seen. Corrections for losses due to finite acceptance are made using Monte Carlo techniques based on a simple baryon exchange model. Comparison is made to another experiment regarding the energy dependence of certain cross sections and a simple power law behavior is observed.
Research Organization:
Illinois Univ., Urbana (USA)
OSTI ID:
5420306
Country of Publication:
United States
Language:
English