Candidate for a Z boson decaying into leptons, produced in association with jets and collected at the ATLAS Experiment

Candidate for Z→μμ decay, with the Z produced in association with three jets, collected on 10 May 2010. In the xy projection, the 144 GeV transverse momentum of the Z boson is especially apparent. The muon transverse momenta are 96 GeV and 68 GeV, and their invariant mass is 79 GeV. The harder muon has left a significant energy deposit (see lego-plot projection), presumably through bremsstrahlung; this is not included in the standard Z mass calculation. The jet transverse energies are 168, 105, and 45 GeV.