Jesper R. Christiansen, Torbjörn Sjöstrand
Colour Reconnection at Future e+e− Colliders


The effects of colour reconnection (CR) at e+e− colliders are revisited, with focus on recently developed CR models. The new models are compared with the LEP2 measurements for e+e−→W+W−→q1q¯2q3q¯4 and found to lie within their limits. Prospects for constraints from new high-luminosity e+e− colliders are discussed. The novel arena of CR in Higgs decays is introduced, and illustrated by shifts in angular correlations that would be used to set limits on a potential CP-odd admixture of the 125 GeV Higgs state.

LU TP 15-25