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A search for a fourth family at the LHC is presently a low priority, but weargue that an effective search can be conducted early with only a few inversefemtobarns of data. We discuss a method based on invariant masses of singlejets for identifying the $W$'s originating from heavy quark decays. This cansignificantly increase signal to background in the reconstruction of the $t'$mass. We also study the various types of physics that can impact the backgroundestimate, most notably higher order effects, initial state radiation, andmodels of the underlying event.Comment: 16 pages, 12 figures, small improvements, version to appear in JHE

t′ at the LHC: the physics of discovery