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An azimuthal angle correlation between the two hardest jets is studied in thettbar production process at the 14 TeV LHC. The event samples are generated bymerging the tree level matrix elements for the ttbar plus up to 2 or 3 partonswith parton showers. The generated event samples show a strong correlation inthe azimuthal angle difference between the two hardest jets, as predicted inthe analysis based on the tree level matrix elements for the ttbar+2 partons.The effects of merging the matrix elements for the ttbar+3 partons on thecorrelation are studied in detail. It is found that they play important rolesin improving the prediction of the correlation.

Study on the azimuthal angle correlation between two jets in the top quark pair production