Study of Bc->J/&psi &mu X

We have performed a search for Bc->J/&psi &mu X in 360 pb-1 of exclusive J/&psi data from Run II. We have identified and estimated several sources of background in the J/&psi+muon mass window of 4.0-6.0 GeV/c2, including decay-in-flight and punch-through of pions, kaons and protons, tri-muons arising from the fragmentation of bb pairs, and fake J/&psi together with a third muon.


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