Study of Z Boson Pair Production in e^+e^- Interactions at \sqrt{s}=192 - 202 GeV

TL;DR

This paper reports measurements of Z boson pair production cross sections in electron-positron collisions at energies between 192 and 202 GeV, confirming Standard Model predictions across various final states including b quarks.

Contribution

First precise measurement of Z boson pair production cross sections at these energies using the L3 detector data, including b quark final states.

Findings

Measured cross sections agree with Standard Model predictions.

Analyzed all visible final states including b quark channels.

Confirmed Standard Model consistency at high energies.

Abstract

The cross section for the production of Z boson pairs is measured using the data collected by the L3 detector at LEP in 1999 in e^+e^- collisions at centre-of-mass energies ranging from 192 GeV up to 202 GeV. Events in all the visible final states are selected, measuring the cross section of this process. The special case of final states containing b quarks is also investigated. All results are in agreement with the Standard Model predictions.