Article ID Journal Published Year Pages File Type
8186087 Nuclear Physics B - Proceedings Supplements 2010 4 Pages PDF
Abstract
The first observation of the J/ψ→μ+μ− resonance using the ATLAS detector, in 7 TeV proton-proton collisions at the LHC, is reported for an integrated luminosity of approximately 6.4 nb−1. The reconstructed invariant mass agrees with the PDG value within statistical uncertainties, and the peak width is compatible with Monte Carlo expectations. The background estimated from Monte Carlo, or reconstructed same sign muon pairs, matches well with observations. The muon trigger and reconstruction efficiencies in this very low transverse momentum region are studied using the J/ψ candidates.
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Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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