Search for inelastic dark matter in events with two displaced muons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for dark matter in events with a displaced nonresonant muon pair and missing transverse momentum is presented. The analysis is performed using an integrated luminosity of 138 fb${}^{-1}$ of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV produced by the LHC in 2016-2018. No significant excess over the predicted backgrounds is observed. Upper limits are set on the product of the inelastic dark matter production cross section $\sigma$(pp $\to$ A' $\to$ ${\chi }_1$ ${\chi }_2$) and the decay branching fraction $\mathcal{B}$(${\chi }_2$ $\to$ ${\chi }_1{\mu }^{+}{\mu }^{-}$), where A' is a dark photon and ${\chi }_1$ and ${\chi }_2$ are states in the dark sector with near mass degeneracy. This is the first dedicated collider search for inelastic dark matter.

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References in corpus (17)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• An Introduction to PYTHIA 8.2
• Results from a search for dark matter in the complete LUX exposure
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Dark matter and the early Universe: a review
• Combination of searches for invisible decays of the Higgs boson using 139 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected with the ATLAS experiment
• Constraints on mediator-based dark matter and scalar dark energy models using $\sqrt{s}=13$ TeV $pp$ collision data collected by the ATLAS detector
• A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for heavy neutral leptons in decays of $W$ bosons using a dilepton displaced vertex in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Search for inelastic scattering of WIMP dark matter in XENON1T
• Search for long-lived particles decaying to leptons with large impact parameter in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraining Light Thermal Inelastic Dark Matter with NA64
• Search for long-lived particles decaying into muon pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV collected with a dedicated high-rate data stream
• Search for long-lived particles decaying to a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Cited by in corpus (3)

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