The muon and neutral hadron detector for BaBar

The muon and neutral hadron detector of the BaBar experiment for the PEP-II Asymmetric B-factory at SLAG uses Resistive Plate Counters (RPCs) as active detectors. A large fraction of the total system, which consists of approximately 800 chambers for an overall surface of 2000 m(2), has already been built and tested in cosmic rays. Preliminary results of the operating characteristics with a new non-flammable and environmentally safe gas mixture are reported. (C) 1998 Elsevier Science B.V. All rights reserved.