Top (tt) : Jet mass : Jet mass

pythia8~8.244--1sherpa~2.2.1Array
(
    [0] => pythia8
    [1] => 8.244--1sherpa
    [2] => 2.2.1
)
Array
(
    [0] => Array
        (
            [0] => pythia8
            [1] => 8.244--1sherpa
        )

    [1] => Array
        (
            [0] => 2.2.1
        )

)
Array
(
    [pythia8] => Array
        (
            [0] => 8.244--1sherpa
        )

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

)

pp @ 8000 GeV