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Long-lived particles are contained in a variety of beyond Standard Modeltheories, including supersymmetric models, universal extra dimensions, ortechnicolor theories. If the lifetime of such a particle is long enough, theparticle can enter - or even pass through - the detector before it decays.Therefore, searches for long-lived particles require a very different searchstrategy compared to conventional searches for particles beyond the StandardModel. If the new particle is not only weakly interacting, the particle can bereconstructed itself and not only via its decay products. A very specificcharacteristic of such new heavy charged particles is their large ionizationlosses when traveling through the detector. This article summarizes searchesfor long-lived particles at the CMS and ATLAS experiments that exploit thepotentially high ionization losses per path length (dE/dx) of the new particle.The presented searches are performed on 8 and/or 13 TeV data. Additionally, anoverview of the methodology of dE/dx measurements at the CMS and ATLASexperiments is given.

Searches for long-lived and highly-ionizing particles at the CMS and ATLAS experiments