Search for heavy, long-lived, charged particles with large ionisation energy loss in $pp$ collisions at $\sqrt{s}=13\text{TeV}$ using the ATLAS experiment and the full Run 2 dataset

Abstract

This paper presents a search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 139 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation losses, $\mathrm{d}E/\mathrm{d}x$. Trajectories reconstructed solely by the inner tracking system and a $\mathrm{d}E/\mathrm{d}x$ measurement in the pixel detector layers provide sensitivity to particles with lifetimes down to $\mathcal{O}(1)$ $\text{ns}$ with a mass, measured using the Bethe--Bloch relation, ranging from 100 GeV to 3 TeV. Interpretations for pair-production of $R$-hadrons, charginos and staus in scenarios of supersymmetry compatible with these particles being long-lived are presented, with mass limits extending considerably beyond those from previous searches in broad ranges of lifetime.

arXiv comment59 pages in total, author list starting page 42, 19 figures, 5 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-42

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