High Precision Test of QCD at Beijing Electron Positron Collider
- Received Date: 1999-02-05
- Accepted Date: 1900-01-01
- Available Online: 1999-09-05
Abstract: The generalized Crewther relation relates the cross section ratio R=σ(e+e-→hadrons)/σ(e+e-→μ+μ-) in e+e- annihilation with the Bjorken sum rule or the Gross-Llewellyn Smith sum rule in deep inelastic scattering and provides a fundamental connection for observables in Quantum Chromodynamics (QCD) without scale or scheme ambiguities. The ratio R can be measmed at the upgrated Beijing Electal Positron Collider or the τ-Charm factory with higher precision and thus can be served for a high Precision test of QCD in the standard model.