Heavy-light decay topologies as a new strategy to discover a heavy gluon

• Published in: The journal of high energy physics 2012-01, Vol.2012 (1), Article 157
• Main Authors: Bini, Cesare, Contino, Roberto, Vignaroli, Natascia
• Format: Article
• Language: English
• Subjects: Classical and Quantum Gravitation; Decay; Elementary Particles; Fermions; Gluons; High energy physics; Large Hadron Collider; Luminosity; Partons; Phenomenology; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Relativity Theory; String Theory; Topology
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP01(2012)157

A bstract We study the collider phenomenology of the lightest Kaluza-Klein excitation of the gluon, G *, in theories with a warped extra dimension. We do so by means of a two-site effective lagrangian which includes only the lowest-lying spin-1 and spin-1/2 resonances. We point out the importance of the decays of G * to one SM plus one heavy fermion, that were overlooked in the previous literature. It turns out that, when kinematically allowed, such heavy-light decays are powerful channels for discovering the G *. In particular, we present a parton-level Montecarlo analysis of the final state W tb that follows from the decay of G * to one SM top or bottom quark plus its heavy partner. We find that at and with 10fb −1 of integrated luminosity, the LHC can discover a KK gluon with mass in the range M G*  = (1 . 8 − 2 . 2) TeV if its coupling to a pair of light quarks is . The same process is also competitive for the discovery of the top and bottom partners as well. We find, for example, that the LHC at can discover a 1 TeV KK bottom quark with an integrated luminosity of (5 . 3 − 0 . 61) fb −1 for .