Abstract
A search for new physics using events containing an imbalance in transverse momentum and one or more energetic jets arising from initial-state radiation or the hadronic decay of W or Z bosons is presented. A data sample of proton-proton collisions at $\sqrt{s} = $ 13 TeV, collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 35.9 fb$^{-1}$, is used. The observed data are found to be in agreement with the expectation from standard model processes. The results are interpreted as limits on the dark matter production cross section in simplified models with vector, axial-vector, scalar, and pseudoscalar mediators. Interpretations in the context of fermion portal and nonthermal dark matter models are also provided. In addition, the results are interpreted in terms of invisible decays of the Higgs boson and set stringent limits on the fundamental Planck scale in the Arkani-Hamed, Dimopoulos, and Dvali model with large extra spatial dimensions.
Highlights
Several astrophysical observations [1,2,3] provide compelling evidence for the existence of dark matter (DM), a type of matter not accounted for in the standard model (SM)
This paper describes a search for new physics resulting in final states with one or more energetic jets and an imbalance in pT due to undetected particles
The light nonthermal DM model [21,22] is a minimal extension of the SM where the DM particle is a Majorana fermion that interacts with the up-type quarks via a colored scalar mediator (X1) with a coupling strength parameter λ2
Summary
Several astrophysical observations [1,2,3] provide compelling evidence for the existence of dark matter (DM), a type of matter not accounted for in the standard model (SM). While the DM particles would remain undetected, they may recoil with large transverse momentum (pT) against other detectable particles, resulting in an overall visible pT imbalance in a collision event This type of event topology is rarely produced in SM processes and enables a highly sensitive search for DM. The mediators couple to quarks and the DM candidate and may be singly produced in association with a DM particle The light nonthermal DM model [21,22] is a minimal extension of the SM where the DM particle is a Majorana fermion (nDM) that interacts with the up-type quarks via a colored scalar mediator (X1) with a coupling strength parameter λ2.
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