Search for Neutral Long Lived Particles Decaying to Two Muons in ppbar Collisions at sqrt(s) = 1.96 TeV

GUSTAVO OTERO Y GARZON, THE DZERO COLLABORATION

PHYSICAL REVIEW LETTERS

Año: 2006 p. 1618021 - 1618027

0031-9007

We present a search for a neutral particle, pair produced in ppbar collisions at sqrt(s) = 1.96 TeV, which decays into two muons and lives long enough to travel at least 5 cm before decaying. The analysis uses 380 pb-1 of data recorded with the D0 detector. The background is estimated to be about one event. No candidates are observed, and limits are set on the pair-production cross section times branching fraction into dimuons + X for such particles. For a mass of 10 GeV and lifetime of 4 x 10-11 s, we exclude values greater than 0.14 pb (95% C.L.). These results are used to limit the interpretation of NuTeV’s excess of dimuon events.