Precision measurement of the total cross section fore+e−→hadrons at a center-of-mass energy of 29 GeV

..hadrons to that for e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R = 3.96 +- 0.09. This value of R is used to determine a value of the strong coupling constant ..cap alpha../sub s/ of 0.23 +- 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. -->
ISSN: 0556-2821
DOI: 10.1103/physrevd.31.1537
Přístupová URL adresa: https://explore.openaire.eu/search/publication?articleId=doi_________::2951e62aea4a04d09500373cb7a34648
https://doi.org/10.1103/physrevd.31.1537
Rights: CLOSED
Přírůstkové číslo: edsair.doi...........2951e62aea4a04d09500373cb7a34648
Autor: E. Fernandez, T. L. Lavine, Alexander Lincoln Read, R. B. Hurst, M. W. Gettner, G. B. Chadwick, B. Gottschalk, J. G. Smith, O. A. Meyer, Tiziano Camporesi, J. P. Venuti, D. E. Wiser, L. J. Moss, R. Prepost, W. W. Ash, Frederic Jean Ronga, Roy Weinstein, H. B. Wald, Hoyun Lee, M. C. Delfino, D. M. Ritson, R. W. Zdarko, H. N. Nelson, J. H. Moromisato, R. Messner, K. Rich, E. von Goeler, Andrea Carlo Marini, D. E. Groom, J. C. Sleeman, W. T. Ford, S. H. Clearwater, R. E. Leedy, L. J. Rosenberg, W. D. Shambroom, K. H. Lau, Brian Heltsley, E. C. Loh, N. Qi, J.R. Johnson, T. Maruyama, M. Piccolo, H. L. Lynch, H. R. Band, S. J. Michalowski, R. W. Coombes, F. Muller, R. de Sangro, H. T. Blume, I. M. Peruzzi, G. P. Goderre, H. S. Kaye
Rok vydání: 1985
Předmět:
Zdroj: Physical Review D. 31:1537-1556
ISSN: 0556-2821
DOI: 10.1103/physrevd.31.1537
Popis: We report a high-precision measurement of the ratio R of the total cross section for e/sup +/e/sup -/..-->..hadrons to that for e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R = 3.96 +- 0.09. This value of R is used to determine a value of the strong coupling constant ..cap alpha../sub s/ of 0.23 +- 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.
Databáze: OpenAIRE
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