Abstract
We study the effect of tt̄Z axial-vector coupling to the tt̄ pair production process near threshold at e+e- colliders. P-wave resonance states produced via axial-vector coupling interfere with S-wave resonance states due to the large top-quark width. This interference gives rise to the forward-backward asymmetry below threshold which grows from 0 to ∼ 7% as mt is increased from 100 to 200 GeV. Its αs dependence is magnified simultaneously. The measurement of the forward-backward asymmetry may allow an efficient determination of αs for a relatively heavy top quark.
| Original language | English |
|---|---|
| Pages (from-to) | 82-92 |
| Number of pages | 11 |
| Journal | Physical Review D |
| Volume | 47 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1993 |