ATLAS on-Z Excess Through Vector-Like Quarks

We investigate the possibility that the excess observed in the leptonic-$Z +$jets $+\slashed{E}_T$ ATLAS SUSY search is due to pair productions of a vector-like quark $U$ decaying to the first-generation quarks and $Z$ boson. We find that the excess can be explained within the 2$σ$ (up to 1.4$σ$) level while evading the constraints from the other LHC searches. The preferred range of the mass and branching ratio are $610 < m_{U} < 760$ GeV and ${\rm Br}(U \rightarrow Z q) > 0.3$-$0.45$, respectively.

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