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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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
Pages (from-to)299-309
Number of pages11
JournalEuropean Physical Journal C
Issue number4
StatePublished - Dec 1982


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