Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - A measurement of the weak axial couplings of theb- andc-quark
AU - Elsen, E.
AU - Finch, Alexander
AU - JADE Collaboration
PY - 1990
Y1 - 1990
N2 - The forward-backward charge asymmetries of theb andc quarks are measured with the JADE detector at PETRA at s√=35 GeV and 44 GeV using both electrons and muons to tag the heavy quarks. At s√=35 GeV, a simultaneous fit for the two asymmetries yields the resultA b =−9.3±5.2% (state.) ndA c =−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 (a c =1,a b =−1) increases the precision of the measurement of coupling constant of the other quark. Using this procedurea b =−0.72±0.34 anda c =0.79±0.40, where the numbers are corrected for BBˉ−mixing and the errors include both statistical and systematic contributions. The mixing parameter for continuum bbˉ−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.
AB - The forward-backward charge asymmetries of theb andc quarks are measured with the JADE detector at PETRA at s√=35 GeV and 44 GeV using both electrons and muons to tag the heavy quarks. At s√=35 GeV, a simultaneous fit for the two asymmetries yields the resultA b =−9.3±5.2% (state.) ndA c =−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 (a c =1,a b =−1) increases the precision of the measurement of coupling constant of the other quark. Using this procedurea b =−0.72±0.34 anda c =0.79±0.40, where the numbers are corrected for BBˉ−mixing and the errors include both statistical and systematic contributions. The mixing parameter for continuum bbˉ−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.
U2 - 10.1007/BF01621022
DO - 10.1007/BF01621022
M3 - Journal article
VL - 46
SP - 349
EP - 359
JO - Zeitschrift für Physik C Particles and Fields
JF - Zeitschrift für Physik C Particles and Fields
SN - 0170-9739
IS - 3
ER -