Event Orientation in e+e- Annihilation

Details Event Orientation in e+e- Annihilation Event Orientation in e+e- Annihilation

1997-12-09

arxiv.org/abs/hep-ph/9712312v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX, 4 figures, uses epsf, to appear in the Proceedings of the XIIth International Workshop on High Energy Physics

Scientific paper

We review the orientation of e+e- \to q\bar q g events in terms of the polar and azimuthal angles of the event plane w.r.t. the electron beam direction. The asymmetry of the azimuthal-angle distribution is, like the left-right forward-backward polar-angle asymmetry, sensitive to parity-violating effects in three-jet events; these are presently being explored experimentally. We present these observables at O(\alpha_s) in perturbative QCD and discuss their dependence on longitudinal beam polarisation and c.m. energy. A moments analysis in terms of the orientation angles allows a more detailed test of QCD by isolating the independent helicity cross-sections.

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