FOCUS is a heavy-flavor photoproduction experiment located at the Wide Band Area of Fermilab. It is an upgraded version of its predecessor, E687.

      The experiment is collected data during the 1996-97 fixed target run, and is investigating several topics in charm physics including high precision studies of charm semileptonic decays, QCD studies using double charm events, a measurement of the absolute branching fraction for the D⁰ meson, a systematic investigation of charm baryons and their lifetimes, and searches for D⁰ mixing, CP violation, rare and forbidden decays, and fully leptonic decays of the D⁺. Based on experience with E687, FOCUS expects to fully reconstruct 10⁶ charm particle decays.

Institutions and People Plots with preliminary signals from E831/FOCUS. Status and Displays (Control room, beam status, profiles, ...) without frames Physics in Collision 1998 (Frascati). Spectrometer FOCUS Interactive Graphics Software (FIGS) Event Displays and Detector Pictures Detector Components and Working Groups Beamline Documentation Online Computing Publications (currently mostly E687 physics results) Conference talks and proceedings FOCUS in Spires (Includes links to major HEP databases) E831 Internal Pages Links to the entire E831 documentation (Password Required) Link to the E687 page The graphic to the right shows how many golden mode charm decays have been reconstructed by Pass1 using our monitoring cuts.

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