Accurate Mass Determinations in Decay Chains with Missing Energy
  Many beyond the Standard Model theories include a stable dark matter candidate that yields missing / invisible energy in collider detectors. If observed at the Large Hadron Collider, we must determine if its mass and other properties (and those of its partners) predict the correct dark matter relic density. We give a new procedure for determining its mass with small error. 
Hsin-Chia Cheng (U.C. Davis), Dalit Engelhardt (Boston U.), John F.   Gunion (U.C. Davis), Zhenyu Han (U.C. Davis) and Bob M...