Higher Order Corrections to Multi Jet Final States at Colliders

The corrections to parton shower approximations with multiple leading order matrix elements and the inclusion of single next-to-leading order (NLO) corrections were investigated in the past. Here an algorithm was developed to merge multiple NLO corrections, without reducing the accuracy of the shower approximation or the NLO calculation. The effects of the NLO corrections are studied and direct comparisons to data are discussed. Improvements above and below the merging scale are observed.