Constraining the minimal dark matter fiveplet with LHC searches

Adding a fermion to the standard model particle content which is a fiveplet under SU(2)L gives a dark matter candidate. The lightest state in the multiplet is neutral and automatically stable. The charged component of the multiplet is only slightly heavier and can travel a finite distance in the LHC detectors before decaying, leaving a charged track which disappears before the edge of the detector. We use the recent ATLAS and CMS searches to exclude a Majorana fiveplet with a mass up to 267 GeV. We estimate that with 3 ab^-1 of √s=14 TeV data this could be pushed to a mass of 520 GeV. These exclusions are ~10% greater than what is achieved for winolike dark matter. We also discuss how the doubly charged states could be used to distinguish a disappearing track signal from that given by a triplet such as the pure wino.