Abstract
A search for long-lived, multi-charged particles is performed using the ATLAS detector. We examine pp collision-data taken during the 2011 LHC running, corresponding to an integrated luminosity of 4.4 fb−1. A search is made for charged particle tracks exhibiting anomalously high ionization consistent with stable massive particles with charges from |q| = 2e to |q| = 6e. For this search new variables of specific energy loss per path length (dE/dx) are developed and used in the candidate selection. No excess is observed with respect to the prediction of Standard Model processes. The 95% CL cross-section limits are interpreted as lower mass limits of 420-490 GeV for a simplified Drell-Yan production model.
Highlights
A search for stable massive particles carrying electric charges in the range of |q| = 2e to |q| = 6e [1] is performed with the ATLAS detector [2] at the LHC [3]
A search is made for charged particle tracks exhibiting anomalously high ionization consistent with stable massive particles with charges from |q| = 2e to |q| = 6e
The resulting 95% CL upper cross section limits are shown in figure 4 alongside the predicted cross sections in the simplified DrellYan model used in the Monte Carlo production
Summary
A search for stable massive particles carrying electric charges in the range of |q| = 2e to |q| = 6e [1] is performed with the ATLAS detector [2] at the LHC [3]. The analysis follows a signature-based approach seeking out charged particle tracks showing anomalously high ionization losses in three ATLAS subdetectors of the inner tracking detectors and the muon system. An observation of such particles would be a clear indication for physics beyond the Standard Model.
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