Search for heavy long-lived multi-charged particles in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector

The ATLAS collaboration
Eur.Phys.J.C 75 (2015) 362, 2015.

Abstract (data abstract)
CERN-LHC. A search for heavy long-lived multi-charged particles is performed using the ATLAS detector at the LHC. Data collected in 2012 at $\sqrt{s} = 8$ TeV from $pp$ collisions corresponding to an integrated luminosity of 20.3 fb$^{-1}$ are examined. Particles producing anomalously high ionisation, consistent with long-lived massive particles with electric charges from |q|=2e to |q|=6e are searched for. No signal candidate events are observed, and 95% confidence level cross-section upper limits are interpreted as lower mass limits for a Drell-Yan production model. The mass limits range between 660 and 785 GeV. Analysis final state is a muon-like particle within the fiducial region of p${_T}$ > 40 GeV and |$\eta$| < 2.0. Background estimation procedure is purely data-driven.

  • Table 1

    Data from Table 2


    The observed event yield in data in the B region, the probability $f$ to find a particle above the respective...

  • Table 2

    Data from Table 3


    Fractions of signal events (in %) with at least one multi-charged particle, which satisfy the given requirements. The uncertainties quoted...

  • Table 3

    Data from Table 4


    Overview of separate contributions (in %) to the systematic uncertainty on the signal. The total uncertainty is given by the...

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