The Bulk RS KK-gluon at the LHC

We study the possibility of discovering and measuring the properties of thelightest Kaluza-Klein excitation of the gluon in a Randall-Sundrum scenariowhere the Standard Model matter and gauge fields propagate in the bulk. TheKK-gluon decays primarily into top quarks. We discuss how to use the $t\bar{t}$ final states to discover and probe the properties of the KK-gluon.Identification of highly energetic tops is crucial for this analysis. We showthat conventional identification methods relying on well separated decayproducts will not work for heavy resonances but suggest alternative methods fortop identification for energetic tops. We find, conservatively, that resonanceswith masses less than 5 TeV can be discovered if the algorithm to identify high$p_T$ tops can reject the QCD background by a factor of 10. We also find thatfor similar or lighter masses the spin can be determined and for lighter massesthe chirality of the coupling to $t\bar t$ can be measured. Since the energetictop pair final state is a generic signature for a large class of new physics asthe top quark presumably couples most strongly to the electroweak symmetrybreaking sector, the methods we have outlined to study the properties of theKK-gluon should also be important in other scenarios.Comment: 21 pages, 13 figure