Abstract
The quark charge asymmetry, summed over flavours, has been measured at centre of mass energies of 35 GeV and 44 GeV using the JADE detector sited on the electron-positron storage ring PETRA. The asymmetry is found to be consistent with the expectations of the standard model at both energies and enables a measurement of the product of the axial-vector coupling constant of the electron with the axial-vector coupling constants of the quarks, assuming the moduli of these latter to be flavour independent. This gives, with reasonable assumptions concerning the effects of\(B^0 \overline {B^0 } \) mixing,a e a q =−1.09±0.18±0.23 where the first error is statistical and the second systematic.
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JADE Collaboration., Greenshaw, T., Warming, P. et al. A measurement of the charge asymmetry of hadronic events in electron positron annihilation. Z. Phys. C - Particles and Fields 42, 1–6 (1989). https://doi.org/10.1007/BF01565123
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DOI: https://doi.org/10.1007/BF01565123