Measurement of R and determination of the charged-particle multiplicity in e+e- annihilation at 13-113-113-1around 10 GeV

H. Allrecht, H. Ehrlichmann, T. Hamacher, A. Krüger, A. Nau, A. Nippe, M. Reidenbach, M. Schäfer, H. Schröder, H. D. Schulz, F. Sefkow, R. Wurth, R. D. Appuhn, C. Hast, G. Herrera, H. Kolanoski, A. Lange, A. Lindner, R. Mankel, M. SchieberT. Siegmund, B. Spaan, H. Thurn, D. Topfer, A. Walther, D. Wegener, M. Paulini, K. Reim, U. Volland, H. Wegener, M. Hapke, R. Mundt, T. Oest, W. Schmidt-Parzefall, W. Funk, J. Stiewe, S. Werner, S. Ball, J. C. Gabriel, C. Geyer, A. Hölscher, W. Hofmann, B. Holzer, S. Khan, K. T. Knöpfle, J. Spengler, D. I. Britton, C. E.K. Charlesworth, K. W. Edwards, H. Kapitza, P. Krieger, R. Kutschke, D. B. MacFarlane, R. S. Orr, P. M. Patel, J. D. Prentice, S. C. Seidel, Y. Tsipolitis, E. Tzamariudaki, R. G. Van de Water, T. S. Yoon, D. Reßing, S. Schael, K. R. Schubert, K. Strahl, R. Waldi, S. Weseler, B. Boštjančič, G. Kernel, P. Križan, E. Križnič, T. Podobnik, T. Živko, H. I. Cronström, L. Jönsson, V. Balagura, M. Danilov, A. Droutskoy, B. Fominykh, A. Golutvin, I. Gorelov, F. Ratnikov, V. Lubimov, A. Rostovtsev, A. Semenov, S. Semenov, V. Shevchenko, V. Soloshenko, I. Tichomirov, Yu Zaitsev, R. Childers, C. W. Darden

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Abstract

We have measured the R value in non-resonant e+e- annihilation using the ARGUS detector at the storage ring DORIS II. At a centre-of-mass energy {Mathematical expression} GeV the ratio of the hadronic cross-section to the μ-pair cross section in lowest order QED has been determined to be R=3.46±0.03±0.13. In addition, we have measured the charged-particle multiplicities in non-resonant hadron production at {Mathematical expression} GeV just below the B {Mathematical expression} threshold and in Υ{hooked} (4 S) resonance decays. For the average charged-particle multiplicities in continuum events and Υ{hooked}(4 S)→B {Mathematical expression} decays we obtain <n>cont=8.35±0.02±0.20 and <n>Υ{hooked}(4 s)=10.81±0.05±0.23.

Original languageEnglish
Pages (from-to)13-19
Number of pages7
JournalZeitschrift für Physik C Particles and Fields
Volume54
Issue number1
DOIs
StatePublished - Mar 1992
Externally publishedYes

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