Measurement of R in e+e- annihilation for {Mathematical expression} between 7.4 and 9.4 GeV

B. Niczyporuk, Z. Jakubowski, G. Nowak, G. Folger, B. Lurz, U. Volland, H. Wegener, J. K. Bienlein, R. Graumann, H. J. Trost, M. Schmitz, F. H. Heimlich, R. Nernst, A. Schwarz, U. Strohbusch, P. Zschorsch, K. W. Chen, A. C. König, D. J. Schotanus, M. ColesA. Engler, R. W. Kraemer, D. Marlow, F. Messing, C. Rippich, S. Youssef, A. Fridman, G. Alexander, A. Av-Shalom, G. Bella, J. Grunhaus, M. Scheer

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38 Scopus citations


The ration R=σ(e+e-→hadrons)/σ(e+e-→ μ+ μ-) was measured with the LENA detector at DORIS in a scan between 7.40 and 7.48 GeV and between 8.67 and 9.43 GeV center of mass energies. Corrected for QED radiative effects, R is found to be constant with an average value of R=3.37 ±0.06stat±0.23syst. No narrow resonances with Γeehadtot)⊗0.30 keV (95% C.L.) and no steps have been observed. Based on this value of R, revised values for υ(1S) resonance parameters are presented.

Original languageEnglish (US)
Pages (from-to)299-309
Number of pages11
JournalZeitschrift für Physik C Particles and Fields
Issue number4
StatePublished - Dec 1982
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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