The Invisible Z' at the LHC

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dc.creatorPetriello, Frank J.
dc.creatorQuackenbush, Seth
dc.creatorZurek, Kathryn M.
dc.date2008-03-27
dc.date2008-06-12
dc.date.accessioned2026-07-07T11:49:24Z
dc.date.available2026-07-07T11:49:24Z
dc.descriptionWe study the feasibility of observing an invisibly decaying Z' at the LHC through the process pp -> ZZ' -> l+l-XX*, where X is any neutral, (quasi-) stable particle, whether a Standard Model (SM) neutrino or a new state. The measurement of the invisible width through this process facilitates both a model independent measurement of Gamma_{Z' -> \bar{nu} nu} and potentially detection of light neutral hidden states. Such particles appear in many models where the Z' is a messenger to a hidden sector, and also if dark matter is charged under the U(1)' of the Z'. We find that with as few as 30 fb^-1 of data the invisibly decaying Z' can be observed at 5 sigma over SM background for a 1 TeV Z' with reasonable couplings. If the Z' does not couple to leptons and therefore cannot be observed in the Drell-Yan channel, this process becomes a discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can be probed at the LHC. If the Z' does couple to leptons, then the rate for this invisible decay is predicted by on-peak data and the presence of additional hidden states can be searched for. With 100 fb^-1 of data, the presence of excess decays to hidden states can be excluded at 95% C.L. if they comprise 20-30% of the total invisible cross section.
dc.description18 pages, 11 figures. References added
dc.identifierhttps://arxiv.org/abs/0803.4005
dc.identifierhttp://arxiv.org/abs/0803.4005
dc.identifierPhys.Rev.D77:115020,2008
dc.identifierdoi:10.1103/PhysRevD.77.115020
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203219
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe Invisible Z' at the LHC
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