Abstract
This analysis evaluates the possibility of the search for Dark Matter (DM) particles using events with a Z heavy gauge boson and a large missing transverse momentum at the Large Hadron Collider (LHC). We consider the muonic decay of Z . The analyzed Monte Carlo samples were the Open simulated files produced by the Compact Muon Solenoid (CMS) collaboration for proton-proton collisions, corresponding to an integrated luminosity of the LHC run-I with 19.7 fb at 8 TeV. Two scenarios, namely a simplified benchmark scenario, called Dark Higgs, and the effective field theory (EFT) formalism, were used for interpretations. Limits were set on Z , dark matter masses, and the cutoff scale of the EFT.
Highlights
One of the interesting open questions in modern physics, that can be explored within the current research, is the existence of a new type of non-luminous matter, which can be possibly made up of non-baryonic particles called Dark Matter (DM)
The need of a DM hypothesis arises from several astrophysical observations and it is supposed that DM contributes to about 27% of the mass of the Universe [1–9]
In parallel to the evidence from astrophysical constrains, direct search for DM at the Large Hadron Collider (LHC) is ongoing using proton-proton collision events with a signature based on large missing transverse momentum
Summary
One of the interesting open questions in modern physics, that can be explored within the current research, is the existence of a new type of non-luminous matter, which can be possibly made up of non-baryonic particles called Dark Matter (DM). The model we study (Mono-Z ) predicts the production of DM in association with the new heavy gauge boson denoted by Z These dark sector particles can be identified in the detectors located at the LHC as a large missing energy[17]. The typical signature of these processes consists of a pair of opposite sign leptons or hadronic jets from the decay of Z plus a large missing transverse momentum due to the stable dark sector particles χ and χ1 These two scenarios were previously studied by the ATLAS collaboration in [22] with the hadronic decay of Z. The cross section is not sensitive to the change in the dark matter particle mass, for this reason we work on the diagonal points for our purpose to put a limit on this parameter which will be discussed in the results
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