P-odd observables at the $Υ$ peak

Details P-odd observables at the $Υ$ peak P-odd observables at the $Υ$ peak

1997-11-24

arxiv.org/abs/hep-ph/9711445v1

Eur.Phys.J.C7:205-215,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages + 3 figures. Submitted to Nucl. Phys B

Scientific paper

10.1007/s100529801007

We study the $\gamma$-Z interference in the process $e^+ e^-\to \Upsilon \to \tau^+ \tau^-$ as a means to measure the neutral current coupling of the b-quark. The helicity amplitudes are calculated from resonant and background diagrams and the spin density matrix of the final state is discussed. The spin analyzer of the $\tau$'s is illustrated with the decays $\pi \nu$ and $\rho \nu \to (\pi \pi) \nu$. With $10^8 \Upsilon$ a sensitivity to $g_V^b$ of a few per cent could be reachable.

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