Abstract
The goal of the Daya Bay reactor neutrino experiment is to measure θ13 with a sensitivity in sin2(2θ13) of 0.01. To achieve this, the cosmic ray induced backgrounds must be reduced to a low level. Daya Bayʼs muon veto system will consist of a 2.5 m active water shield and RPCs. The muon tagging efficiency of the combined system is expected to be at least 99.5%. The details of the muon system and estimates of the expected backgrounds will be described.
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