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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

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
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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