A measurement of the weak axial couplings of the b- and c-quark

E. Elsen, J. Allison, K. Ambrus, R. J. Barlow, W. Bartel, S. Bethke, C. K. Bowdery, S. L. Cartwright, J. Chrin, D. Clarke, A. Dieckmann, I. P. Duerdoth, G. Eckerlin, R. Felst, A. J. Finch, F. Foster, T. Greenshaw, J. Hagemann, D. Haidt, J. HeintzeG. Heinzelmann, K. H. Hellenbrand, P. Hill, G. Hughes, H. Kado, T. Kawamoto, C. Kleinwort, G. Knies, T. Kobayashi, S. Komamiya, H. Krehbiel, J. v. Krogh, M. Kuhlen, F. K. Loebinger, A. A. Macbeth, N. Magnussen, R. Marshall, R. Meinke, R. P. Middleton, H. Minowa, P. G. Murphy, B. Naroska, J. M. Nye, J. Olsson, F. Ould-Saada, R. Ramcke, H. Rieseberg, D. Schmidt, H. von der Schmitt, L. Smolik, U. Schneekloth, J. A.J. Skard, J. Spitzer, P. Steffen, K. Stephens, A. Wagner, I. W. Walker, G. Weber, M. Zimmer, G. T. Zorn

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Abstract

The forward-backward charge asymmetries of the b and c quarks are measured with the JADE detector at PETRA at {Mathematical expression} GeV and 44 GeV using both electrons and muons to tag the heavy quarks. At {Mathematical expression} GeV, a simultaneous fit for the two asymmetries yields the result Ab=-9.3±5.2% (state.) nd Ac=-9.6±4.0% (stat.). The systematic errors are comparable with the statistical uncertainties. Combining the measurements at both energies and alternately constraining the weak coupling of the c and b quark to their Standard Model values (ac=1, ab=-1) increases the precision of the measurement of coupling constant of the other quark. Using this procedure ab=-0.72±0.34 and ac=0.79±0.40, where the numbers are corrected for {Mathematical expression} and the errors include both statistical and systematic contributions. The mixing parameter for continuum {Mathematical expression} is determined to be χ-0.24±0.12 if both heavy quark coupling constants are constrained to their values in the Standard Model.

Original languageEnglish
Pages (from-to)349-359
Number of pages11
JournalZeitschrift für Physik C Particles and Fields
Volume46
Issue number3
DOIs
Publication statusPublished - 1990 Sep 1

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Elsen, E., Allison, J., Ambrus, K., Barlow, R. J., Bartel, W., Bethke, S., Bowdery, C. K., Cartwright, S. L., Chrin, J., Clarke, D., Dieckmann, A., Duerdoth, I. P., Eckerlin, G., Felst, R., Finch, A. J., Foster, F., Greenshaw, T., Hagemann, J., Haidt, D., ... Zorn, G. T. (1990). A measurement of the weak axial couplings of the b- and c-quark. Zeitschrift für Physik C Particles and Fields, 46(3), 349-359. https://doi.org/10.1007/BF01621022