Search for dark matter produced in association with bottom or top quarks in s=13 TeV pp collisions with the ATLAS detector.

doi:10.1140/EPJC/S10052-017-5486-1

Abstract:

A search for weakly interacting massive dark matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse ...

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TL;DR: In this paper, a preliminary set of updated NLO parton distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections are presented, along with additional jet data from HERA and the Tevatron.

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Abstract: Weakly interacting massive particles (WIMPs) have long reigned as one of the leading classes of dark matter candidates. The observed dark matter abundance can be naturally obtained by freezeout of weak-scale dark matter annihilations in the early Universe. This ``thermal WIMP'' scenario makes direct predictions for the total annihilation cross section that can be tested in present-day experiments. While the dark matter mass constraint can be as high as ${m}_{\ensuremath{\chi}}\ensuremath{\gtrsim}100\text{ }\text{ }\mathrm{GeV}$ for particular annihilation channels, the constraint on the total cross section has not been determined. We construct the first model-independent limit on the WIMP total annihilation cross section, showing that allowed combinations of the annihilation-channel branching ratios considerably weaken the sensitivity. For thermal WIMPs with $s$-wave $2\ensuremath{\rightarrow}2$ annihilation to visible final states, we find the dark matter mass is only known to be ${m}_{\ensuremath{\chi}}\ensuremath{\gtrsim}20\text{ }\text{ }\mathrm{GeV}$. This is the strongest largely model-independent lower limit on the mass of thermal-relic WIMPs; together with the upper limit on the mass from the unitarity bound (${m}_{\ensuremath{\chi}}\ensuremath{\lesssim}100\text{ }\text{ }\mathrm{TeV}$), it defines what we call the ``WIMP window.'' To probe the remaining mass range, we outline ways forward.

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TL;DR: In this article, the authors proposed a systematic search strategy for all possible leptoquark flavors by focusing on leptonark pair production and extended this strategy to large (order unity) leptonoquark couplings, which offer new search opportunities: single lepton-quark production and t-channel lepton exchange with dilepton final states.

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TL;DR: In this paper, a review describes how colliders contribute to the search for particle dark matter, focusing on the highest-energy collider currently in operation, the Large Hadron Collider (LHC) at CERN.

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TL;DR: The Gelfant 4 toolkit as discussed by the authors is a toolkit for simulating the passage of particles through matter, including a complete range of functionality including tracking, geometry, physics models and hits.

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Search for dark matter produced in association with bottom or top quarks in s=13 TeV pp collisions with the ATLAS detector.

Citations

Parton distributions for the LHC

HistFitter software framework for statistical data analysis

GeV-scale thermal WIMPs: Not even slightly ruled out

The Leptoquark Hunter's Guide: Large Coupling

Dark Matter Searches at Colliders

References

Geant4—a simulation toolkit

Seven-year wilkinson microwave anisotropy probe (wmap *) observations: cosmological interpretation

Planck 2015 results - XIII. Cosmological parameters

Planck 2015 results. XIII. Cosmological parameters

Geant4 - A Simulation Toolkit

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