Abstract

The colour reconnection effects were intensively studied with LEP2 data and are a dominant sources of systematic uncertainty in the W boson mass in e+e− annihilation at LEP2 and one of a dominant sources of systematic uncertainty in the top quark mass determination at hadronic colliders. With the discovery of Higgs boson, a new arena for the effects studies opened up. The effects are discussed within the existent different models and what future tests may come with a future FCC-ee.

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