Measuring the Mass of Dark Matter at the LHC
arXiv:1308.5671 · doi:10.1103/PhysRevD.88.116001
Abstract
Many methods have been developed for measuring the mass of invisible particles that only use kinematic information available at hadron colliders. Because a particle is identified by its mass, these methods are critical when distinguishing between dark matter and fake dark matter, where a neutrino or other massless states can mimic a dark-matter signal. However, the uncertainty associated with measuring the mass of an invisible particle could be so large that it is indistinguishable from a neutrino. Monte Carlo is used to estimate lower bounds on how heavy an invisible particle must be in order for it to be distinguishable from a massless one at 95% CL, which we estimate to be O(10 GeV). This result, to a good approximation, is independent of the way the massive final-state particle is produced. If there is a light dark-matter particle with mass O(10 GeV), its presence will be difficult to unambiguously identify at the LHC, using kinematic information alone.
10 page, 5 figures
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