Charged particle and π0 multiplicity distributions and the annihilation properties of $$\bar p$$</h3> <table class= Autor: Dumont, J. J., Lemonne, J., Vanhomwegen, G., Verbeure, F., Wickens, J., Hagman, V. M., Keski-Kuha, P., Tuominiemi, J., Valtonen, K., Estruch, J. A., Evans, W. H., Mason, P., Muirhead, H., Baland, J. F., Grard, F., Herquet, P., Poiret, C., Ekspong, G., Selldén, B., Szilly, L., Yamdagni, N. Zdroj: Zeitschrift für Physik C Particles and Fields; March 1982, Vol. 13 Issue: 1 p1-9, 9p Abstrakt: The elastic and inelastic $$\bar p$$ p cross sections at 70 GeV/c have been determined in an experiment performed at CERN using BEBC equipped with a TST. The topological cross sections were measured and the moments of the inelastic multiplicity distribution are 〈nc〉=6.16±0.09, 〈nc〉/D=2.04±0.05 andf2cc=2.97±0.03. The average number of Dalitz pairs per inelastic event is (3.12±0.09)×10−2. Assuming that these all arise from π0 decay the average π0 multiplicity is $$\langle n_{\pi ^0 } \rangle = 2.71 \pm 0.14$$ . The $$\bar p$$ p−pp cross section differences lead to an annihilation cross section σA = 4.42±0.41 mb and the moments of the annihilation multiplicty distribution are 〈nA〉=8.0±0.3, 〈nA〉/D=2.5±0.2 andf2A−−=−1.4±0.3. An independent check of σA was made by investigating fast forward charged and neutral secondary interactions in the TST and in the surrounding neon-hydrogen mixture, and gives a value σA = 5.0±1.6 mb. The ratio of fast $$\bar n$$ to $$\bar p$$ production in non-annihilation interactions at 70 GeV/c is found to be 0.45±0.11. Databáze: Supplemental Index Externí odkaz: