Top (parton level) : Δφ (ttbar)

pythia6~6.427--1sherpa~1.3.1Array
(
    [0] => pythia6
    [1] => 6.427--1sherpa
    [2] => 1.3.1
)
Array
(
    [0] => Array
        (
            [0] => pythia6
            [1] => 6.427--1sherpa
        )

    [1] => Array
        (
            [0] => 1.3.1
        )

)
Array
(
    [pythia6] => Array
        (
            [0] => 6.427--1sherpa
        )

    [1.3.1] => Array
        (
            [0] => 
        )

)

pp @ 7000 GeV

ppbar @ 1960 GeV