Abstract
Several extensions of the Standard Model predict the production of dark matter particles at the LHC. An uncharted signature of dark matter particles produced in association with VV=W^{±}W^{∓} or ZZ pairs from a decay of a dark Higgs boson s is searched for using 139 fb^{-1} of pp collisions recorded by the ATLAS detector at a center-of-mass energy of 13TeV. The s→V(qq[over ¯])V(qq[over ¯]) decays are reconstructed with a novel technique aimed at resolving the dense topology from boosted VV pairs using jets in the calorimeter and tracking information. Dark Higgs scenarios with m_{s}>160 GeV are excluded.
Highlights
Several extensions of the Standard Model predict the production of dark matter particles at the LHC
An uncharted signature of dark matter particles produced in association with VV 1⁄4 WÆW∓ or ZZ pairs from a decay of a dark Higgs boson s is searched for using 139 fb−1 of pp collisions recorded by the ATLAS detector at a center-of-mass energy of 13 TeV
Overwhelming astrophysical evidence [1,2,3,4] suggests the existence of dark matter (DM)
Summary
Several extensions of the Standard Model predict the production of dark matter particles at the LHC. The smallest azimuthal angle between the EmT iss and any of the three highest-pT (leading) small-R jets is required to be at least π=9 in order to reduce the multijet background arising from mismeasured jet momenta. Higgs boson’s decay products become collimated and are reconstructed inside a single TAR jet These topologies are targeted in the merged category, defined as containing at least one TAR jet with pTTAR > 300 GeV, and mass mTAR between 100 and 400 GeV. In such cases, events failing the merged-category requirements are considered in the intermediate category, where the s candidate is reconstructed from a TAR jet with mTAR > 60 GeV that is supplemented by up to two additional small-R jets within ΔR 1⁄4 2.5 of the TAR jet.
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