A Measurement of the Weak Axial Couplings of the $b$ and $c$ Quark

GeV, a simultaneous fit for the two asymmetries yields the resultAb=−9.3±5.2% (state.) ndAc=−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 thec andb 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 procedureab=−0.72±0.34 andac=0.79±0.40, where the numbers are corrected for

B\bar B - mixing

and the errors include both statistical and systematic contributions. The mixing parameter for continuum

b\bar b - production

is determined to be χ-0.24±0.12 if both heavy quark coupling constants are constrained to their values in the Standard Model.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
charm
bottom
quark: pair production
pair production: quark
angular distribution: asymmetry
asymmetry: angular distribution

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