Abstract
We study the sensitivity of top pair production at the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, including full tree level standard model background effects and interferences while assuming realistic final state reconstruction efficiencies. We demonstrate that exploiting asymmetry observables represents a promising way to distinguish between a selection of benchmark Z' models due to their unique dependences on the chiral couplings of the new gauge boson.
Highlights
IntroductionZ bosons are a ubiquitous feature of theories beyond the Standard Model (SM) arising from various BSM scenarios such as U (1) gauge extensions of the SM motivated by supersymmetry or grand unified theories, Kaluza-Klein excitations of SM gauge fields or excitations of composite exotic vector mesons in technicolor theories to name a few
Z bosons are a ubiquitous feature of theories beyond the Standard Model (SM) arising from various BSM scenarios such as U (1) gauge extensions of the SM motivated by supersymmetry or grand unified theories, Kaluza-Klein excitations of SM gauge fields or excitations of composite exotic vector mesons in technicolor theories to name a few.Typically, such resonances are searched for at hadron colliders via the Drell-Yan (DY) production of a lepton pair, i.e., pp(p) → (γ, Z, Z ) → + −, where = e, μ
We study the scope of the Large Hadron Collider (LHC) to profile a Z boson mediating ttproduction, in both standard kinematic variables as well as spatial/spin asymmetries, by adopting some benchmark scenarios for several realisations of the sequential, Left-Right symmetric and E6 based Z models
Summary
Z bosons are a ubiquitous feature of theories beyond the Standard Model (SM) arising from various BSM scenarios such as U (1) gauge extensions of the SM motivated by supersymmetry or grand unified theories, Kaluza-Klein excitations of SM gauge fields or excitations of composite exotic vector mesons in technicolor theories to name a few Such resonances are searched for at hadron colliders via the Drell-Yan (DY) production of a lepton pair, i.e., pp(p) → (γ, Z, Z ) → + −, where = e, μ. Several phenomenological studies on how to measure the Z properties and couplings to SM particles in this clean DY channel have been performed These proceedings summarise a recently published paper [3] addressing the use of the top-antitop final state, i.e., pp(p) → (γ, Z, Z ) → tt, to probe these Z properties. The issue of distinguishability of various models using these observables is addressed
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