π^{}p Interactions at 2.7 BeVc (FourProng Events)
Abstract
This report is based on the study of 8115 fourprongs produced by the interactions of 2.7BeVcπ^{} mesons with protons in the Lawrence Radiation Laboratory 72in. hydrogen bubble chamber. The total fourprong cross section is found to be 5.01+/0.12 mb, and the cross sections for each of the final states are: (π^{}pπ^{}π^{+}, 1.83+/0.05 mb), (π^{}pπ^{}π^{+}π^{0}, 1.53+/0.04 mb), (π^{}nπ^{}π^{+}π^{+}, 0.67+/0.02 mb), [π^{}pπ^{}π^{+}(mπ^{0}), (m>=2), 0.44+/0.02 mb], and [π^{}nπ^{ }π^{+}π^{+} (mπ^{0}), (m>=1), 0.54+/0.02 mb]. The finalstate π^{}pπ^{}π^{+} is dominated by the production of N^{*++}(1238)[(42+/4)%] and ρ^{0}[(38+/9)%], and the finalstate π^{}nπ^{}π^{+}π^{+} by the production of N^{*}(1238)[(72+/12)%]. The fractions of ω and N^{*++}(1238) production in the channel π^{}pπ^{}π^{+}π^{0} are estimated to be (32+/4)% and (20+/5)%, respectively. Also presented are the effectivemass plots, production angular distributions, and decay angular correlations.
 Publication:

Physical Review
 Pub Date:
 October 1966
 DOI:
 10.1103/PhysRev.150.1123
 Bibcode:
 1966PhRv..150.1123K