A search for highly ionising, penetrating particles with electric charges from | q | = 2 e to 6 e is performed using the ATLAS detector at the CERN Large Hadron Collider. Proton–proton collision data taken at s = 7 ? TeV during the 2011 running period, corresponding to an integrated luminosity of 4.4 ? fb ? 1 , are analysed. No signal candidates are observed, and 95% confidence level cross-section upper limits are interpreted as mass-exclusion lower limits for a simplified Drell–Yan production model. In this model, masses are excluded from 50 ? GeV up to 430, 480, 490, 470 and 420 ? GeV for charges 2 e , 3 e , 4 e , 5 e and 6 e , respectively.
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