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Many extensions of the Standard Model predict the existence of charged heavylong-lived particles, such as $R$-hadrons or charginos. These particles, ifproduced at the Large Hadron Collider, should be moving non-relativisticallyand are therefore identifiable through the measurement of an anomalously largespecific energy loss in the ATLAS pixel detector. Measuring heavy long-livedparticles through their track parameters in the vicinity of the interactionvertex provides sensitivity to metastable particles with lifetimes from 0.6 nsto 30 ns. A search for such particles with the ATLAS detector at the LargeHadron Collider is presented, based on a data sample corresponding to anintegrated luminosity of 18.4 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 8TeV. No significant deviation from the Standard Model background expectation isobserved, and lifetime-dependent upper limits on $R$-hadrons and charginoproduction are set. Gluino $R$-hadrons with 10 ns lifetime and masses up to1185 GeV are excluded at 95$\%$ confidence level, and so are charginos with 15ns lifetime and masses up to 482 GeV.

Search for metastable heavy charged particles with large ionisation energy loss in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS experiment