2010/08/17 by Sunghoon Jung, James D. Wells · 18 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Electroweak interaction #Electroweak scale #Fermion #Lepton #Neutrino Physics Research #Observable #Particle physics theoretical and experimental studies #Quark #Standard Model (mathematical formulation) #Technicolor #Top quark #hep-ph
paper · pdf · doi:10.1007/jhep11(2010)001
published in Journal of High Energy Physics 2010(11) (Springer Nature) · 35 pages, 8 figures. discussions improved, references added
arxiv created 2010/08/17 · openalex publication_date 2010/11/01 · arxiv updated 2010/11/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Within warped extra dimension models that explain flavor through geometry, flavor changing neutral current constraints generally force the Kaluza-Klein scale to be above many TeV. This creates tension with a natural electroweak scale. On the other hand, a much lower scale compatible with precision electroweak and flavor changing neutral current constraints is allowed if we decouple the Kaluza-Klein states of Standard Model gauge bosons from light fermions (c light ≃ c b ≃ 0.5 bulk mass parameters). The main signature for this approach is four top quark production via the Kaluza-Klein excitations’ strong coupling to top quarks. We study single lepton, like-sign dilepton, and trilepton observables of four-top events at the Large Hadron Collider. The like-sign dilepton signature typically has the largest discovery potential for a strongly coupled right-handed top case (M KK ∼ 2 − 2.5 TeV), while single lepton is the better when the left-handed top couples most strongly (M KK ∼ 2 TeV). We also describe challenging lepton-jet collimation issues in the like-sign dilepton and trilepton channels. An alternative single lepton observable is considered which takes advantage of the many bottom quarks in the final state. Although searches of other particles may compete, we find that four top production via Kaluza-Klein gluons is most promising in a large region of this parameter space.