Search for Excess Dimuon Production in the Radial Region 1 . 6 < r . 10 cm at the D 0 Experiment

We report on a study of dimuon events produced in p ¯ p collisions at √ s = 1.96 TeV, performed at the D0 experiment using data corresponding to 0.9 fb −1 of integrated luminosity collected during 2008. Using information from the inner-layer silicon tracking detector, we observe 712 ± 462 ± 942 events in which one or both muons are produced in the range 1.6 < r 10 cm, which is expressed as a fraction (0.40 ± 0.26 ± 0.53)% of the total dimuon sample. We therefore see no anomalously large excess of muons produced a few centimeters away from the interaction point.