Precision measurement of the total cross section for e+ e− →hadrons at a center-of-mass energy of 29 GeV
Year: 1985
Type: article
Abstract: We report a high-precision measurement of the ratio R of the total cross section for ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}hadrons to that for ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\ensuremath{\mu}}^{+}$${\ensuremath{\mu}}^{\mathrm{\ensuremath{-}}}$, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R=3.96\ifmmode\pm\else\textpm\fi{}0.09. This value of R is used to determine a value of the strong coupling constant ${\ensuremath{\alpha}}_{s}$ of 0.23\ifmmode\pm\else\textpm\fi{}0.06, nearly independent of fragmentation models. Two different analysis methods having quite different event-selection criteria have been used and the results are in agreement. Particular attention has been given to the study of systematic errors. New higher-order QED calculations are used for the luminosity determination and the acceptance for hadrons.
Authors: E. Fernandez, W. T. Ford, N. Qi, A. L. Read, J. G. Smith, T. Camporesi, R. De Sangro, A. Marini, I. Peruzzi, M. Piccolo, F. Ronga, H. T. Blume, R. B. Hurst, J. C. Sleeman, J. P. Venuti, H. B. Wald, Roy Weinstein, H. R. Band, M. W. Gettner, G. P. Goderre, B. Gottschalk, O. A. Meyer, J. H. Moromisato, W. D. Shambroom, E. von Goeler, W. W. Ash, G. B. Chadwick, S. H. Clearwater, R. W. Coombes, H. S. Kaye, K. H. Lau, R. E. Leedy, H. L. Lynch, R. L. Messner, S. J. Michalowski, F. Muller, L. J. Moss, H. N. Nelson, K. Rich, D. M. Ritson, L. J. Rosenberg, D. E. Wiser, R. W. Zdarko, D. E. Groom, Hoyun Lee, E. C. Loh, M. C. Delfino, B. K. Heltsley, J. R. Johnson, T. L. Lavine, T. Maruyama, R. Prepost
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2016986925